diff --git a/code/l452_code/Core/Inc/main.h b/code/l452_code/Core/Inc/main.h
index b13c295..3920b07 100644
--- a/code/l452_code/Core/Inc/main.h
+++ b/code/l452_code/Core/Inc/main.h
@@ -59,7 +59,6 @@ void Error_Handler(void);
 /* Private defines -----------------------------------------------------------*/
 #define IMU_DRDY_Pin GPIO_PIN_3
 #define IMU_DRDY_GPIO_Port GPIOC
-#define IMU_DRDY_EXTI_IRQn EXTI3_IRQn
 #define CLKIN_ADC_Pin GPIO_PIN_0
 #define CLKIN_ADC_GPIO_Port GPIOA
 #define ADC_CS_Pin GPIO_PIN_3
@@ -84,7 +83,6 @@ void Error_Handler(void);
 #define LED3_GPIO_Port GPIOB
 #define PPG_DRDY_Pin GPIO_PIN_7
 #define PPG_DRDY_GPIO_Port GPIOC
-#define PPG_DRDY_EXTI_IRQn EXTI9_5_IRQn
 #define SD_DETECT_Pin GPIO_PIN_15
 #define SD_DETECT_GPIO_Port GPIOA
 
diff --git a/code/l452_code/Core/Inc/max30101.hpp b/code/l452_code/Core/Inc/max30101.hpp
new file mode 100644
index 0000000..1566a57
--- /dev/null
+++ b/code/l452_code/Core/Inc/max30101.hpp
@@ -0,0 +1,5 @@
+#include "i2c.h"
+
+void initialize_max30101(I2C_HandleTypeDef *hi2c1);
+
+void read_max30101(I2C_HandleTypeDef *hi2c1);
diff --git a/code/l452_code/Core/Inc/packet.hpp b/code/l452_code/Core/Inc/packet.hpp
index d96acd6..b4f3a5f 100644
--- a/code/l452_code/Core/Inc/packet.hpp
+++ b/code/l452_code/Core/Inc/packet.hpp
@@ -25,43 +25,21 @@ struct packet_vbatt {
 
 struct packet_imu {
   uint32_t t;
-  uint16_t readings_cnts[4];
+  uint8_t data[141];
 };
 
-struct packet_ekg {
+struct packet_adc {
   uint32_t t;
   uint8_t index;
-  int32_t readings_cnts[50];
-};
-
-struct packet_strain {
-  uint32_t t;
-  uint8_t index;
-  int32_t readings_cnts[5];
-};
-
-struct packet_outsideT {
-  uint32_t t;
-  uint8_t index;
-  int32_t readings_cnts[5];
-};
-
-struct packet_insideT {
-  uint32_t t;
-  uint8_t index;
-  int32_t readings_cnts[5];
-};
-
-struct packet_button {
-  uint32_t t;
-  uint8_t button_vec;
+  int32_t ekg_readings_cnts[50];
+  int32_t str_readings_cnts[5];
+  int32_t oT_readings_cnts[5];
+  int32_t iT_readings_cnts[5];
 };
 
 struct packet_spo2 {
   uint32_t t;
-  uint32_t green_cnts[25];
-  uint32_t red_cnts[25];
-  uint32_t ir_cnts[25];
+  uint8_t bytes[180];
 };
 
 struct packet_msg {
@@ -85,41 +63,21 @@ __inline__ uint8_t typecode<struct packet_vbatt>() {
 }
 
 template<>
-__inline__ uint8_t typecode<struct packet_ekg>() {
+__inline__ uint8_t typecode<struct packet_imu>() {
   return 3;
 }
 
 template<>
-__inline__ uint8_t typecode<struct packet_strain>() {
+__inline__ uint8_t typecode<struct packet_adc>() {
   return 4;
 }
 
 template<>
-__inline__ uint8_t typecode<struct packet_outsideT>() {
+__inline__ uint8_t typecode<struct packet_spo2>() {
   return 5;
 }
 
 template<>
-__inline__ uint8_t typecode<struct packet_insideT>() {
+__inline__ uint8_t typecode<struct packet_msg>() {
   return 6;
 }
-
-template<>
-__inline__ uint8_t typecode<struct packet_button>() {
-  return 7;
-}
-
-template<>
-__inline__ uint8_t typecode<struct packet_spo2>() {
-  return 8;
-}
-
-template<>
-__inline__ uint8_t typecode<struct packet_imu>() {
-  return 9;
-}
-
-template<>
-__inline__ uint8_t typecode<struct packet_msg>() {
-  return 10;
-}
diff --git a/code/l452_code/Core/Inc/stm32l4xx_it.h b/code/l452_code/Core/Inc/stm32l4xx_it.h
index 9a73687..1286e5d 100644
--- a/code/l452_code/Core/Inc/stm32l4xx_it.h
+++ b/code/l452_code/Core/Inc/stm32l4xx_it.h
@@ -56,9 +56,10 @@ void DebugMon_Handler(void);
 void PendSV_Handler(void);
 void SysTick_Handler(void);
 void EXTI0_IRQHandler(void);
-void EXTI3_IRQHandler(void);
 void DMA1_Channel4_IRQHandler(void);
 void DMA1_Channel5_IRQHandler(void);
+void DMA1_Channel6_IRQHandler(void);
+void DMA1_Channel7_IRQHandler(void);
 void ADC1_IRQHandler(void);
 void EXTI9_5_IRQHandler(void);
 void I2C1_EV_IRQHandler(void);
diff --git a/code/l452_code/Core/Src/ads131.cpp b/code/l452_code/Core/Src/ads131.cpp
index 2b8481c..38cf449 100644
--- a/code/l452_code/Core/Src/ads131.cpp
+++ b/code/l452_code/Core/Src/ads131.cpp
@@ -18,7 +18,7 @@ void initialize_ads131(SPI_HandleTypeDef *hspi1) {
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_RESET);
   HAL_SPI_TransmitReceive(hspi1, (uint8_t*) cmd, (uint8_t*) rx_buff, 18, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_SET);
-  HAL_Delay(1);
+  HAL_Delay(2);
 
   // set OSR, reg 3h
   cmd[0] = 0b01100001;
@@ -32,11 +32,11 @@ void initialize_ads131(SPI_HandleTypeDef *hspi1) {
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_RESET);
   HAL_SPI_TransmitReceive(hspi1, (uint8_t*) cmd, (uint8_t*) rx_buff, 18, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_SET);
-  HAL_Delay(1);
+  HAL_Delay(2);
 
   memset(cmd, 0, 6);
 
-  // set gain to 8, reg 4h
+  // set gain to 1, reg 4h
   cmd[0] = 0b01100010;
   cmd[1] = 0b00000000;
   cmd[2] = 0x00;
@@ -48,7 +48,7 @@ void initialize_ads131(SPI_HandleTypeDef *hspi1) {
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_RESET);
   HAL_SPI_TransmitReceive(hspi1, (uint8_t*) cmd, (uint8_t*) rx_buff, 18, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_SET);
-  HAL_Delay(1);
+  HAL_Delay(2);
 
   memset(cmd, 0, 6);
 
@@ -60,10 +60,7 @@ void initialize_ads131(SPI_HandleTypeDef *hspi1) {
   }
 }
 
-struct packet_ekg p_ekg;
-struct packet_strain p_strain;
-struct packet_outsideT p_outsideT;
-struct packet_insideT p_insideT;
+struct packet_adc p_adc;
 
 extern volatile uint16_t tim6_reloads;
 
@@ -83,58 +80,23 @@ void read_ads131(SPI_HandleTypeDef *hspi1) {
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_RESET);
   HAL_SPI_TransmitReceive(hspi1, (uint8_t*) cmd, (uint8_t*) rx_buff, 18, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOA, ADC_CS_Pin, GPIO_PIN_SET);
-  // WARNING AVERAGING LATER PROBABLY WON'T WORK - 2s COMPLEMENT!!!
-  //--------------
-  if (p_ekg.index == 0) {
-    p_ekg.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
+
+  if (p_adc.index == 0) {
+    p_adc.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
 
   }
-  p_ekg.readings_cnts[p_ekg.index] = to_signed_24(&rx_buff[3]);
-
-  if (p_ekg.index == 49) {
-    write(p_ekg);
-    p_ekg.index = 0;
+  p_adc.ekg_readings_cnts[p_adc.index] = to_signed_24(&rx_buff[3]);
+  p_adc.str_readings_cnts[p_adc.index / 10] += to_signed_24(&rx_buff[6]);
+  p_adc.oT_readings_cnts[p_adc.index / 10] += to_signed_24(&rx_buff[9]);
+  p_adc.iT_readings_cnts[p_adc.index / 10] += to_signed_24(&rx_buff[12]);
+  
+  if (p_adc.index == 49) {
+    write(p_adc);
+    p_adc.index = 0;
+    memset(p_adc.str_readings_cnts, 0, sizeof(p_adc.str_readings_cnts));
+    memset(p_adc.oT_readings_cnts, 0, sizeof(p_adc.oT_readings_cnts));
+    memset(p_adc.iT_readings_cnts, 0, sizeof(p_adc.iT_readings_cnts));
   } else {
-    p_ekg.index++;
+    p_adc.index++;
   }
-  //-------------
-  if (p_strain.index == 0) {
-    p_strain.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
-  }
-  p_strain.readings_cnts[p_strain.index / 10] += to_signed_24(&rx_buff[6]);
-
-  if (p_strain.index == 49) {
-    write(p_strain);
-    p_strain.index = 0;
-    memset(p_strain.readings_cnts, 0, sizeof(p_strain.readings_cnts));
-  } else {
-    p_strain.index++;
-  }
-  //-------------
-  if (p_outsideT.index == 0) {
-    p_outsideT.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
-  }
-  p_outsideT.readings_cnts[p_outsideT.index / 10] += to_signed_24(&rx_buff[9]);
-
-  if (p_outsideT.index == 49) {
-    write(p_outsideT);
-    p_outsideT.index = 0;
-    memset(p_outsideT.readings_cnts, 0, sizeof(p_outsideT.readings_cnts));
-  } else {
-    p_outsideT.index++;
-  }
-  //-------------
-  if (p_insideT.index == 0) {
-    p_insideT.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
-  }
-  p_insideT.readings_cnts[p_insideT.index / 10] += to_signed_24(&rx_buff[12]);
-
-  if (p_insideT.index == 49) {
-    write(p_insideT);
-    p_insideT.index = 0;
-    memset(p_insideT.readings_cnts, 0, sizeof(p_insideT.readings_cnts));
-  } else {
-    p_insideT.index++;
-  }
-  //-------------
 }
diff --git a/code/l452_code/Core/Src/datadescriptor.cpp b/code/l452_code/Core/Src/datadescriptor.cpp
index 4ba1c6f..9125a82 100644
--- a/code/l452_code/Core/Src/datadescriptor.cpp
+++ b/code/l452_code/Core/Src/datadescriptor.cpp
@@ -21,37 +21,17 @@ void data_description(bool to_usb, bool to_file) {
     if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
     HAL_Delay(50);
 
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d\n\r", "packet_imu", typecode<packet_imu>(), sizeof(packet_imu), "uint32_t t", offsetof(packet_imu, t), sizeof(uint32_t), "uint16_t readings_cnts[4]", offsetof(packet_imu, readings_cnts), sizeof(uint16_t));
+    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d\n\r", "packet_imu", typecode<packet_imu>(), sizeof(packet_imu), "uint32_t t", offsetof(packet_imu, t), sizeof(uint32_t), "uint8_t data[141]", offsetof(packet_imu, data), sizeof(uint8_t));
     if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
     if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
     HAL_Delay(50);
 
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d %s %d %d\n\r", "packet_ekg", typecode<packet_ekg>(), sizeof(packet_ekg), "uint32_t t", offsetof(packet_ekg, t), sizeof(uint32_t), "uint8_t index", offsetof(packet_ekg, index), sizeof(uint8_t), "int32_t readings_cnts[50]", offsetof(packet_ekg, readings_cnts), sizeof(int32_t));
+    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d %s %d %d %s %d %d %s %d %d %s %d %d\n\r", "packet_adc", typecode<packet_adc>(), sizeof(packet_adc), "uint32_t t", offsetof(packet_adc, t), sizeof(uint32_t), "uint8_t index", offsetof(packet_adc, index), sizeof(uint8_t), "int32_t ekg_readings_cnts[50]", offsetof(packet_adc, ekg_readings_cnts), sizeof(int32_t), "int32_t str_readings_cnts[5]", offsetof(packet_adc, str_readings_cnts), sizeof(int32_t), "int32_t oT_readings_cnts[5]", offsetof(packet_adc, oT_readings_cnts), sizeof(int32_t), "int32_t iT_readings_cnts[5]", offsetof(packet_adc, iT_readings_cnts), sizeof(int32_t));
     if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
     if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
     HAL_Delay(50);
 
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d %s %d %d\n\r", "packet_strain", typecode<packet_strain>(), sizeof(packet_strain), "uint32_t t", offsetof(packet_strain, t), sizeof(uint32_t), "uint8_t index", offsetof(packet_strain, index), sizeof(uint8_t), "int32_t readings_cnts[5]", offsetof(packet_strain, readings_cnts), sizeof(int32_t));
-    if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
-    if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
-    HAL_Delay(50);
-
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d %s %d %d\n\r", "packet_outsideT", typecode<packet_outsideT>(), sizeof(packet_outsideT), "uint32_t t", offsetof(packet_outsideT, t), sizeof(uint32_t), "uint8_t index", offsetof(packet_outsideT, index), sizeof(uint8_t), "int32_t readings_cnts[5]", offsetof(packet_outsideT, readings_cnts), sizeof(int32_t));
-    if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
-    if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
-    HAL_Delay(50);
-
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d %s %d %d\n\r", "packet_insideT", typecode<packet_insideT>(), sizeof(packet_insideT), "uint32_t t", offsetof(packet_insideT, t), sizeof(uint32_t), "uint8_t index", offsetof(packet_insideT, index), sizeof(uint8_t), "int32_t readings_cnts[5]", offsetof(packet_insideT, readings_cnts), sizeof(int32_t));
-    if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
-    if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
-    HAL_Delay(50);
-
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d\n\r", "packet_button", typecode<packet_button>(), sizeof(packet_button), "uint32_t t", offsetof(packet_button, t), sizeof(uint32_t), "uint8_t button_vec", offsetof(packet_button, button_vec), sizeof(uint8_t));
-    if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
-    if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
-    HAL_Delay(50);
-
-    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d %s %d %d %s %d %d\n\r", "packet_spo2", typecode<packet_spo2>(), sizeof(packet_spo2), "uint32_t t", offsetof(packet_spo2, t), sizeof(uint32_t), "uint32_t green_cnts[25]", offsetof(packet_spo2, green_cnts), sizeof(uint32_t), "uint32_t red_cnts[25]", offsetof(packet_spo2, red_cnts), sizeof(uint32_t), "uint32_t ir_cnts[25]", offsetof(packet_spo2, ir_cnts), sizeof(uint32_t));
+    cx = snprintf(buff, sizeof(buff), "%s %d %d %s %d %d %s %d %d\n\r", "packet_spo2", typecode<packet_spo2>(), sizeof(packet_spo2), "uint32_t t", offsetof(packet_spo2, t), sizeof(uint32_t), "uint8_t bytes[180]", offsetof(packet_spo2, bytes), sizeof(uint8_t));
     if (to_file) {unsigned int bw; f_write(&file, buff, cx, &bw);}
     if (to_usb) {CDC_Transmit_FS((uint8_t*)buff, cx);}
     HAL_Delay(50);
diff --git a/code/l452_code/Core/Src/dma.c b/code/l452_code/Core/Src/dma.c
index 869b1f6..bb0cf44 100644
--- a/code/l452_code/Core/Src/dma.c
+++ b/code/l452_code/Core/Src/dma.c
@@ -50,6 +50,12 @@ void MX_DMA_Init(void)
   /* DMA1_Channel5_IRQn interrupt configuration */
   HAL_NVIC_SetPriority(DMA1_Channel5_IRQn, 0, 0);
   HAL_NVIC_EnableIRQ(DMA1_Channel5_IRQn);
+  /* DMA1_Channel6_IRQn interrupt configuration */
+  HAL_NVIC_SetPriority(DMA1_Channel6_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(DMA1_Channel6_IRQn);
+  /* DMA1_Channel7_IRQn interrupt configuration */
+  HAL_NVIC_SetPriority(DMA1_Channel7_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(DMA1_Channel7_IRQn);
   /* DMA2_Channel4_IRQn interrupt configuration */
   HAL_NVIC_SetPriority(DMA2_Channel4_IRQn, 0, 0);
   HAL_NVIC_EnableIRQ(DMA2_Channel4_IRQn);
diff --git a/code/l452_code/Core/Src/gpio.c b/code/l452_code/Core/Src/gpio.c
index 35f956e..26089fd 100644
--- a/code/l452_code/Core/Src/gpio.c
+++ b/code/l452_code/Core/Src/gpio.c
@@ -59,9 +59,9 @@ void MX_GPIO_Init(void)
   /*Configure GPIO pin Output Level */
   HAL_GPIO_WritePin(GPIOB, LED1_Pin|LED2_Pin|LED3_Pin, GPIO_PIN_SET);
 
-  /*Configure GPIO pins : IMU_DRDY_Pin PPG_DRDY_Pin */
-  GPIO_InitStruct.Pin = IMU_DRDY_Pin|PPG_DRDY_Pin;
-  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
+  /*Configure GPIO pins : IMU_DRDY_Pin BUTTON2_Pin */
+  GPIO_InitStruct.Pin = IMU_DRDY_Pin|BUTTON2_Pin;
+  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
@@ -85,12 +85,6 @@ void MX_GPIO_Init(void)
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
   HAL_GPIO_Init(IMU_CS_GPIO_Port, &GPIO_InitStruct);
 
-  /*Configure GPIO pin : BUTTON2_Pin */
-  GPIO_InitStruct.Pin = BUTTON2_Pin;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(BUTTON2_GPIO_Port, &GPIO_InitStruct);
-
   /*Configure GPIO pin : BUTTON1_Pin */
   GPIO_InitStruct.Pin = BUTTON1_Pin;
   GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
@@ -104,6 +98,12 @@ void MX_GPIO_Init(void)
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
+  /*Configure GPIO pin : PPG_DRDY_Pin */
+  GPIO_InitStruct.Pin = PPG_DRDY_Pin;
+  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+  GPIO_InitStruct.Pull = GPIO_PULLUP;
+  HAL_GPIO_Init(PPG_DRDY_GPIO_Port, &GPIO_InitStruct);
+
   /*Configure GPIO pin : SD_DETECT_Pin */
   GPIO_InitStruct.Pin = SD_DETECT_Pin;
   GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
@@ -114,9 +114,6 @@ void MX_GPIO_Init(void)
   HAL_NVIC_SetPriority(EXTI0_IRQn, 0, 0);
   HAL_NVIC_EnableIRQ(EXTI0_IRQn);
 
-  HAL_NVIC_SetPriority(EXTI3_IRQn, 0, 0);
-  HAL_NVIC_EnableIRQ(EXTI3_IRQn);
-
   HAL_NVIC_SetPriority(EXTI9_5_IRQn, 0, 0);
   HAL_NVIC_EnableIRQ(EXTI9_5_IRQn);
 
diff --git a/code/l452_code/Core/Src/i2c.c b/code/l452_code/Core/Src/i2c.c
index 44629db..bfbed9e 100644
--- a/code/l452_code/Core/Src/i2c.c
+++ b/code/l452_code/Core/Src/i2c.c
@@ -25,6 +25,8 @@
 /* USER CODE END 0 */
 
 I2C_HandleTypeDef hi2c1;
+DMA_HandleTypeDef hdma_i2c1_rx;
+DMA_HandleTypeDef hdma_i2c1_tx;
 
 /* I2C1 init function */
 void MX_I2C1_Init(void)
@@ -38,7 +40,7 @@ void MX_I2C1_Init(void)
 
   /* USER CODE END I2C1_Init 1 */
   hi2c1.Instance = I2C1;
-  hi2c1.Init.Timing = 0x10D19CE4;
+  hi2c1.Init.Timing = 0x00F12981;
   hi2c1.Init.OwnAddress1 = 0;
   hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
   hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
@@ -105,6 +107,41 @@ void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle)
     /* I2C1 clock enable */
     __HAL_RCC_I2C1_CLK_ENABLE();
 
+    /* I2C1 DMA Init */
+    /* I2C1_RX Init */
+    hdma_i2c1_rx.Instance = DMA1_Channel7;
+    hdma_i2c1_rx.Init.Request = DMA_REQUEST_3;
+    hdma_i2c1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
+    hdma_i2c1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
+    hdma_i2c1_rx.Init.MemInc = DMA_MINC_ENABLE;
+    hdma_i2c1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
+    hdma_i2c1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
+    hdma_i2c1_rx.Init.Mode = DMA_NORMAL;
+    hdma_i2c1_rx.Init.Priority = DMA_PRIORITY_LOW;
+    if (HAL_DMA_Init(&hdma_i2c1_rx) != HAL_OK)
+    {
+      Error_Handler();
+    }
+
+    __HAL_LINKDMA(i2cHandle,hdmarx,hdma_i2c1_rx);
+
+    /* I2C1_TX Init */
+    hdma_i2c1_tx.Instance = DMA1_Channel6;
+    hdma_i2c1_tx.Init.Request = DMA_REQUEST_3;
+    hdma_i2c1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
+    hdma_i2c1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
+    hdma_i2c1_tx.Init.MemInc = DMA_MINC_ENABLE;
+    hdma_i2c1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
+    hdma_i2c1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
+    hdma_i2c1_tx.Init.Mode = DMA_NORMAL;
+    hdma_i2c1_tx.Init.Priority = DMA_PRIORITY_LOW;
+    if (HAL_DMA_Init(&hdma_i2c1_tx) != HAL_OK)
+    {
+      Error_Handler();
+    }
+
+    __HAL_LINKDMA(i2cHandle,hdmatx,hdma_i2c1_tx);
+
     /* I2C1 interrupt Init */
     HAL_NVIC_SetPriority(I2C1_EV_IRQn, 0, 0);
     HAL_NVIC_EnableIRQ(I2C1_EV_IRQn);
@@ -133,6 +170,10 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 
     HAL_GPIO_DeInit(GPIOA, GPIO_PIN_10);
 
+    /* I2C1 DMA DeInit */
+    HAL_DMA_DeInit(i2cHandle->hdmarx);
+    HAL_DMA_DeInit(i2cHandle->hdmatx);
+
     /* I2C1 interrupt Deinit */
     HAL_NVIC_DisableIRQ(I2C1_EV_IRQn);
   /* USER CODE BEGIN I2C1_MspDeInit 1 */
diff --git a/code/l452_code/Core/Src/lsm6dsv.cpp b/code/l452_code/Core/Src/lsm6dsv.cpp
index 649920c..ddefd6a 100644
--- a/code/l452_code/Core/Src/lsm6dsv.cpp
+++ b/code/l452_code/Core/Src/lsm6dsv.cpp
@@ -15,98 +15,90 @@ void initialize_lsm6dsv(SPI_HandleTypeDef *hspi1) {
   hspi1->Init.CLKPolarity = SPI_POLARITY_HIGH;
   HAL_SPI_Init(hspi1);
 
-  // Reset
-  tx_buff[0] = 0x01;
+  tx_buff[0] = 0x01; // Reset
   tx_buff[1] = 0x04;
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
-  HAL_Delay(1);
+  HAL_Delay(30);
 
-  tx_buff[0] = 0x09; // Set 7.5Hz data rate for fifo
-  tx_buff[1] = 0b00100010;
+  tx_buff[0] = 0x03; // active high pushpull interrupt
+  tx_buff[1] = 0x01; // I2C and I3C disabled
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
-
-  tx_buff[0] = 0x0A; // Set continuous mode for fifo
-  tx_buff[1] = 0b00000110;
+  HAL_Delay(30);
+  
+  tx_buff[0] = 0x09; // Set 60Hz data rate for fifo
+  tx_buff[1] = 0b01010101;
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
 
   tx_buff[0] = 0x0D; // Set drdy based on fifo
   tx_buff[1] = 0b00111000;
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
 
-  tx_buff[0] = 0x10; // Set 7.5Hz accelerometer high performance
-  tx_buff[1] = 0b00000010;
+  tx_buff[0] = 0x10; // Set 60Hz accelerometer high performance
+  tx_buff[1] = 0b00000101;
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
 
-  tx_buff[0] = 0x11; // Set 7.5Hz gyro high performance
-  tx_buff[1] = 0b00000010;
+  tx_buff[0] = 0x11; // Set 60Hz gyro high performance
+  tx_buff[1] = 0b00000101;
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
 
   // todo: get watermark working
   tx_buff[0] = 0x07;
-  tx_buff[1] = 0x07;
+  tx_buff[1] = 21; // 21 samples
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
   HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
   HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
+
+  tx_buff[0] = 0x0A; // Set bypass mode for fifo
+  tx_buff[1] = 0b00000000; // to clear fifo
+  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
+  HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
+  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
+
+  tx_buff[0] = 0x0A; // Set continuous mode for fifo
+  tx_buff[1] = 0b00000110;
+  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
+  HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 2, HAL_MAX_DELAY);
+  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  HAL_Delay(30);
 }
 
 struct packet_imu p_imu;
 
 void read_lsm6dsv(SPI_HandleTypeDef *hspi1) {
   
-  if (HAL_GPIO_ReadPin(GPIOC, IMU_DRDY_Pin) != GPIO_PIN_RESET) {
+  if (HAL_GPIO_ReadPin(GPIOC, IMU_DRDY_Pin) == GPIO_PIN_RESET) {
     return;
   }
 
-  //CDC_Transmit_FS((uint8_t*) "Detected\n\r", 10);
-  
-  uint8_t tx_buff[8] = {0};
-  uint8_t rx_buff[8] = {0};
-
   HAL_SPI_DeInit(hspi1);
   hspi1->Init.CLKPolarity = SPI_POLARITY_HIGH;
   HAL_SPI_Init(hspi1);
-      
-  tx_buff[0] = 0b10000000 + 0x1B;
-  tx_buff[1] = 0;
-  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
-  HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 3, HAL_MAX_DELAY);
-  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
 
-  // todo: read in batches  
-  if (rx_buff[1] != 0) {
-    tx_buff[0] = 0b10000000 + 0x78; // FIFO addr
-    tx_buff[1] = 0;
-    HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);  
-    HAL_SPI_TransmitReceive(hspi1, tx_buff, rx_buff, 8, HAL_MAX_DELAY);
-    HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  uint8_t tx_buff[141] = {0b10000000 + 0x78}; // FIFO addr
   
-    // cx = snprintf(buffer, 64, "%02x %02x %02x %02x %02x %02x %02x %02x\n\r",
-    //               rx_buff[0],
-    //               rx_buff[1],
-    //               rx_buff[2],
-    //               rx_buff[3],
-    //               rx_buff[4],
-    //               rx_buff[5],
-    //               rx_buff[6],
-    //               rx_buff[7]);
-    // CDC_Transmit_FS((uint8_t*)buffer, cx);
-    p_imu.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
-    p_imu.readings_cnts[0] = rx_buff[1];
-    p_imu.readings_cnts[1] = ((uint16_t)rx_buff[2] << 8) + rx_buff[3];
-    p_imu.readings_cnts[2] = ((uint16_t)rx_buff[4] << 8) + rx_buff[5];
-    p_imu.readings_cnts[3] = ((uint16_t)rx_buff[6] << 8) + rx_buff[7];
-    write(p_imu);
-  }
+  // Watermark set for 21 samples, read 20
+  tx_buff[0] = 0b10000000 + 0x78; // FIFO addr
+  p_imu.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
+  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_RESET);
+  HAL_SPI_TransmitReceive(hspi1, tx_buff, p_imu.data, 141, HAL_MAX_DELAY);
+  HAL_GPIO_WritePin(GPIOC, IMU_CS_Pin, GPIO_PIN_SET);
+  write(p_imu);
 }
diff --git a/code/l452_code/Core/Src/main.cpp b/code/l452_code/Core/Src/main.cpp
index fc7f3f4..884ccc0 100644
--- a/code/l452_code/Core/Src/main.cpp
+++ b/code/l452_code/Core/Src/main.cpp
@@ -39,6 +39,7 @@
 #include "buff.hpp"
 #include "ads131.hpp"
 #include "lsm6dsv.hpp"
+#include "max30101.hpp"
 #include "datadescriptor.hpp"
 /* USER CODE END Includes */
 
@@ -146,10 +147,7 @@ void turn_on_sd(void) {
       return;
     }
     alignas(32) char buffer1[32];
-    alignas(32) char buffer2[32];
     int cx = snprintf(buffer1, 32, "%08lu.log", ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT % 99999999);
-    cx = snprintf(buffer2, 32, "%s\n\r", buffer1);
-    CDC_Transmit_FS((uint8_t*)buffer2, cx);
     res = f_open(&file, buffer1, FA_WRITE | FA_CREATE_ALWAYS);
     if (res != FR_OK) {
       res = f_mount(NULL, "", 1);
@@ -167,7 +165,6 @@ void turn_off_sd(void) {
     f_sync(&file);
     f_close(&file);
     res = f_mount(NULL, "", 1);
-    CDC_Transmit_FS((uint8_t*)"CLS\n\r", 7);
     sd_ready = false;
   }
 }
@@ -217,7 +214,7 @@ int main(void)
   MX_USB_DEVICE_Init();
   MX_FATFS_Init();
   /* USER CODE BEGIN 2 */
-  
+
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -226,20 +223,24 @@ int main(void)
   //HAL_UART_Receive_DMA(&huart1, uart_rx_data, sizeof(uart_rx_data));
   // For some reason initializing the ads131 first breaks the lsm6dsv gyro readings
   initialize_lsm6dsv(&hspi1);
-  initialize_ads131(&hspi1);
+  //initialize_ads131(&hspi1);
+  //initialize_max30101(&hi2c1);
 
-  uint8_t buf[512];
-  
   while (1)
   {
-    if (to_turn_on_sd) {
-      turn_on_sd();
-    }
-
-    if (to_turn_off_sd) {
-      turn_off_sd();
-    }
+    read_lsm6dsv(&hspi1);
+    //read_max30101(&hi2c1);
+    //read_ads131(&hspi1);
+    HAL_Delay(1);
     continue;
+    // if (to_turn_on_sd) {
+    //   turn_on_sd();
+    // }
+
+    // if (to_turn_off_sd) {
+    //   turn_off_sd();
+    // }
+    // continue;
     /* USER CODE END WHILE */
     
     /* USER CODE BEGIN 3 */
@@ -273,7 +274,6 @@ int main(void)
 
     read_ads131(&hspi1);
     read_lsm6dsv(&hspi1);
-
     // HAL_GPIO_WritePin(GPIOB, LED1_Pin|LED2_Pin|LED3_Pin, GPIO_PIN_SET);
     // HAL_Delay(100);
     // HAL_GPIO_WritePin(GPIOB, LED1_Pin|LED2_Pin|LED3_Pin, GPIO_PIN_RESET);
diff --git a/code/l452_code/Core/Src/max30101.cpp b/code/l452_code/Core/Src/max30101.cpp
new file mode 100644
index 0000000..71cf4e8
--- /dev/null
+++ b/code/l452_code/Core/Src/max30101.cpp
@@ -0,0 +1,75 @@
+#include "max30101.hpp"
+
+#include <cstring>
+
+#include "gpio.h"
+#include "tim.h"
+
+#include "packet.hpp"
+#include "buff.hpp"
+
+extern uint16_t tim6_reloads;
+struct packet_spo2 p_spo2;
+uint8_t data[4];
+
+bool followup = false;
+bool print_ready = false;
+void HAL_I2C_MemRxCpltCallback(I2C_HandleTypeDef *hi2c1) {
+  if (not followup) {
+    print_ready = true;
+    // Clear interrupt
+    HAL_I2C_Mem_Read_DMA(hi2c1, 0xAE, 0x00, 1, data, 1);
+    followup = true;
+  } else {
+    followup = false;
+  }
+}
+
+void initialize_max30101(I2C_HandleTypeDef *hi2c1) {
+  data[0] = 0b01000111; // Reset
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x09, 1, data, 1, HAL_MAX_DELAY);
+  data[0] = 0b00000111; // Turn on all LEDs
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x09, 1, data, 1, HAL_MAX_DELAY);
+  data[0] = 0b00000011; //0.4mS pulse width
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x0A, 1, data, 1, HAL_MAX_DELAY);
+  
+  memset(data, 0x0F, 4); // Set power
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x0C, 1, data, 4, HAL_MAX_DELAY);
+  
+  data[0] = 0b00010010; // Time slots: RED, IR
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x11, 1, data, 1, HAL_MAX_DELAY);
+  data[0] = 0b00000011; // Time slots ctd: None, Green
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x12, 1, data, 1, HAL_MAX_DELAY);
+
+  // No averaging, FIFO rollover, FIFO almost full @ 29 samples
+  data[0] = 0b00010011;
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x08, 1, data, 1, HAL_MAX_DELAY);
+    
+  // Interrupt only on FIFO almost full
+  data[0] = 0b10000000;
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x02, 1, data, 1, HAL_MAX_DELAY);
+
+  // clear write and read ptrs
+  data[0] = 0;
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x04, 1, data, 1, HAL_MAX_DELAY);
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x05, 1, data, 1, HAL_MAX_DELAY);
+  HAL_I2C_Mem_Write(hi2c1, 0xAE, 0x06, 1, data, 1, HAL_MAX_DELAY);
+
+  // read once to start the thing
+  HAL_I2C_Mem_Read(hi2c1, 0xAE, 0x07, 1, p_spo2.bytes, 180, HAL_MAX_DELAY);
+}
+
+void read_max30101(I2C_HandleTypeDef *hi2c1) {
+  if (print_ready) {
+    p_spo2.t = ((uint32_t)tim6_reloads) * (htim6.Init.Period + 1) + TIM6->CNT;
+    write(p_spo2);
+    print_ready = false;
+  }
+  if (HAL_GPIO_ReadPin(GPIOC, PPG_DRDY_Pin) != GPIO_PIN_RESET) {
+    return;
+  }
+  if (HAL_I2C_GetState(hi2c1) == HAL_I2C_STATE_READY) {
+    HAL_I2C_Mem_Read_DMA(hi2c1, 0xAE, 0x07, 1, p_spo2.bytes, 180);
+    print_ready = false;
+  }
+}
diff --git a/code/l452_code/Core/Src/spi.c b/code/l452_code/Core/Src/spi.c
index b14d342..fb65223 100644
--- a/code/l452_code/Core/Src/spi.c
+++ b/code/l452_code/Core/Src/spi.c
@@ -44,7 +44,7 @@ void MX_SPI1_Init(void)
   hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
   hspi1.Init.CLKPhase = SPI_PHASE_2EDGE;
   hspi1.Init.NSS = SPI_NSS_SOFT;
-  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
+  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
   hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
   hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
   hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
diff --git a/code/l452_code/Core/Src/stm32l4xx_it.c b/code/l452_code/Core/Src/stm32l4xx_it.c
index 2c78a54..4bf280f 100644
--- a/code/l452_code/Core/Src/stm32l4xx_it.c
+++ b/code/l452_code/Core/Src/stm32l4xx_it.c
@@ -57,6 +57,8 @@
 /* External variables --------------------------------------------------------*/
 extern PCD_HandleTypeDef hpcd_USB_FS;
 extern ADC_HandleTypeDef hadc1;
+extern DMA_HandleTypeDef hdma_i2c1_rx;
+extern DMA_HandleTypeDef hdma_i2c1_tx;
 extern I2C_HandleTypeDef hi2c1;
 extern DMA_HandleTypeDef hdma_sdmmc1;
 extern SD_HandleTypeDef hsd1;
@@ -221,20 +223,6 @@ void EXTI0_IRQHandler(void)
   /* USER CODE END EXTI0_IRQn 1 */
 }
 
-/**
-  * @brief This function handles EXTI line3 interrupt.
-  */
-void EXTI3_IRQHandler(void)
-{
-  /* USER CODE BEGIN EXTI3_IRQn 0 */
-
-  /* USER CODE END EXTI3_IRQn 0 */
-  HAL_GPIO_EXTI_IRQHandler(IMU_DRDY_Pin);
-  /* USER CODE BEGIN EXTI3_IRQn 1 */
-
-  /* USER CODE END EXTI3_IRQn 1 */
-}
-
 /**
   * @brief This function handles DMA1 channel4 global interrupt.
   */
@@ -263,6 +251,34 @@ void DMA1_Channel5_IRQHandler(void)
   /* USER CODE END DMA1_Channel5_IRQn 1 */
 }
 
+/**
+  * @brief This function handles DMA1 channel6 global interrupt.
+  */
+void DMA1_Channel6_IRQHandler(void)
+{
+  /* USER CODE BEGIN DMA1_Channel6_IRQn 0 */
+
+  /* USER CODE END DMA1_Channel6_IRQn 0 */
+  HAL_DMA_IRQHandler(&hdma_i2c1_tx);
+  /* USER CODE BEGIN DMA1_Channel6_IRQn 1 */
+
+  /* USER CODE END DMA1_Channel6_IRQn 1 */
+}
+
+/**
+  * @brief This function handles DMA1 channel7 global interrupt.
+  */
+void DMA1_Channel7_IRQHandler(void)
+{
+  /* USER CODE BEGIN DMA1_Channel7_IRQn 0 */
+
+  /* USER CODE END DMA1_Channel7_IRQn 0 */
+  HAL_DMA_IRQHandler(&hdma_i2c1_rx);
+  /* USER CODE BEGIN DMA1_Channel7_IRQn 1 */
+
+  /* USER CODE END DMA1_Channel7_IRQn 1 */
+}
+
 /**
   * @brief This function handles ADC1 global interrupt.
   */
@@ -286,7 +302,6 @@ void EXTI9_5_IRQHandler(void)
 
   /* USER CODE END EXTI9_5_IRQn 0 */
   HAL_GPIO_EXTI_IRQHandler(ADC_DRDY_Pin);
-  HAL_GPIO_EXTI_IRQHandler(PPG_DRDY_Pin);
   /* USER CODE BEGIN EXTI9_5_IRQn 1 */
 
   /* USER CODE END EXTI9_5_IRQn 1 */
diff --git a/code/l452_code/Makefile b/code/l452_code/Makefile
index 2eccd16..06ae779 100644
--- a/code/l452_code/Makefile
+++ b/code/l452_code/Makefile
@@ -1,5 +1,5 @@
 ##########################################################################################################################
-# File automatically-generated by tool: [projectgenerator] version: [4.9.0-B19] date: [Tue May 05 18:08:47 CDT 2026] 
+# File automatically-generated by tool: [projectgenerator] version: [4.9.0-B19] date: [Thu May 07 13:29:52 CDT 2026] 
 ##########################################################################################################################
 
 # ------------------------------------------------
diff --git a/code/l452_code/imu_grapher.py b/code/l452_code/imu_grapher.py
new file mode 100644
index 0000000..6810ae1
--- /dev/null
+++ b/code/l452_code/imu_grapher.py
@@ -0,0 +1,44 @@
+import serial
+import matplotlib.pyplot as plt
+import numpy as np
+
+ser = serial.Serial(port='/dev/ttyACM1', timeout = 1)
+ser.flush()
+ser.reset_input_buffer()
+
+gyros = []
+accs = []
+
+fig, axs = plt.subplots(2)
+i = 0
+
+while(1):
+    x = [int(e, 16) for e in ser.readline()[1:-1].split(b" ")]
+    imu_reading_type = x[0] >> 3
+    imu_reading_tag_cnt = (x[0] >> 1) & 3
+    #print(imu_reading_type, imu_reading_tag_cnt)
+    reading_xyz = [int.from_bytes(x[1:3], byteorder = 'little', signed = True),
+                   int.from_bytes(x[3:5], byteorder = 'little', signed = True),
+                   int.from_bytes(x[5:7], byteorder = 'little', signed = True)]
+    i += 1
+    if imu_reading_type == 1:
+        gyros.append([250 * e / (1 << 16) for e in reading_xyz])
+    elif imu_reading_type == 2:
+        accs.append([4 * e / (1<<16) for e in reading_xyz])
+
+        if len(gyros) > 50 and (i % 10) == 0:
+            gyros = gyros[-100:]
+            accs = accs[-100:]
+            a = np.array(accs)
+            g = np.array(gyros)
+            a -= np.mean(a, axis = 0).reshape(1, 3)
+            g -= np.mean(g, axis = 0).reshape(1, 3)
+            axs[0].cla()
+            axs[0].plot(g[:,0])
+            axs[0].plot(g[:,1])
+            axs[0].plot(g[:,2])
+            axs[1].cla()
+            axs[1].plot(a[:,0])
+            axs[1].plot(a[:,1])
+            axs[1].plot(a[:,2])
+            plt.pause(0.0001)
diff --git a/code/l452_code/l452_code.ioc b/code/l452_code/l452_code.ioc
index be7d9d7..2588b9d 100644
--- a/code/l452_code/l452_code.ioc
+++ b/code/l452_code/l452_code.ioc
@@ -10,10 +10,30 @@ ADC1.master=1
 CAD.formats=
 CAD.pinconfig=
 CAD.provider=
+Dma.I2C1_RX.3.Direction=DMA_PERIPH_TO_MEMORY
+Dma.I2C1_RX.3.Instance=DMA1_Channel7
+Dma.I2C1_RX.3.MemDataAlignment=DMA_MDATAALIGN_BYTE
+Dma.I2C1_RX.3.MemInc=DMA_MINC_ENABLE
+Dma.I2C1_RX.3.Mode=DMA_NORMAL
+Dma.I2C1_RX.3.PeriphDataAlignment=DMA_PDATAALIGN_BYTE
+Dma.I2C1_RX.3.PeriphInc=DMA_PINC_DISABLE
+Dma.I2C1_RX.3.Priority=DMA_PRIORITY_LOW
+Dma.I2C1_RX.3.RequestParameters=Instance,Direction,PeriphInc,MemInc,PeriphDataAlignment,MemDataAlignment,Mode,Priority
+Dma.I2C1_TX.4.Direction=DMA_MEMORY_TO_PERIPH
+Dma.I2C1_TX.4.Instance=DMA1_Channel6
+Dma.I2C1_TX.4.MemDataAlignment=DMA_MDATAALIGN_BYTE
+Dma.I2C1_TX.4.MemInc=DMA_MINC_ENABLE
+Dma.I2C1_TX.4.Mode=DMA_NORMAL
+Dma.I2C1_TX.4.PeriphDataAlignment=DMA_PDATAALIGN_BYTE
+Dma.I2C1_TX.4.PeriphInc=DMA_PINC_DISABLE
+Dma.I2C1_TX.4.Priority=DMA_PRIORITY_LOW
+Dma.I2C1_TX.4.RequestParameters=Instance,Direction,PeriphInc,MemInc,PeriphDataAlignment,MemDataAlignment,Mode,Priority
 Dma.Request0=USART1_RX
 Dma.Request1=USART1_TX
 Dma.Request2=SDMMC1
-Dma.RequestsNb=3
+Dma.Request3=I2C1_RX
+Dma.Request4=I2C1_TX
+Dma.RequestsNb=5
 Dma.SDMMC1.2.Direction=DMA_PERIPH_TO_MEMORY
 Dma.SDMMC1.2.Instance=DMA2_Channel4
 Dma.SDMMC1.2.MemDataAlignment=DMA_MDATAALIGN_WORD
@@ -59,8 +79,9 @@ FATFS0.BSP.semaphore=
 FATFS0.BSP.solution=PA15 (JTDI)
 File.Version=6
 GPIO.groupedBy=Group By Peripherals
-I2C1.IPParameters=Timing
-I2C1.Timing=0x10D19CE4
+I2C1.I2C_Speed_Mode=I2C_Fast
+I2C1.IPParameters=Timing,I2C_Speed_Mode
+I2C1.Timing=0x00F12981
 KeepUserPlacement=false
 Mcu.CPN=STM32L452RET3
 Mcu.Family=STM32L4
@@ -129,10 +150,11 @@ NVIC.ADC1_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.BusFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 NVIC.DMA1_Channel4_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
 NVIC.DMA1_Channel5_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
+NVIC.DMA1_Channel6_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
+NVIC.DMA1_Channel7_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
 NVIC.DMA2_Channel4_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
 NVIC.DebugMonitor_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
 NVIC.EXTI0_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
-NVIC.EXTI3_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.EXTI9_5_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.ForceEnableDMAVector=true
 NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
@@ -221,10 +243,11 @@ PC11.Mode=SD_4_bits_Wide_bus
 PC11.Signal=SDMMC1_D3
 PC12.Mode=SD_4_bits_Wide_bus
 PC12.Signal=SDMMC1_CK
-PC3.GPIOParameters=GPIO_Label
+PC3.GPIOParameters=GPIO_PuPd,GPIO_Label
 PC3.GPIO_Label=IMU_DRDY
+PC3.GPIO_PuPd=GPIO_NOPULL
 PC3.Locked=true
-PC3.Signal=GPXTI3
+PC3.Signal=GPIO_Input
 PC4.GPIOParameters=PinState,GPIO_Label
 PC4.GPIO_Label=IMU_CS
 PC4.Locked=true
@@ -234,10 +257,11 @@ PC5.GPIOParameters=GPIO_Label
 PC5.GPIO_Label=BUTTON2
 PC5.Locked=true
 PC5.Signal=GPIO_Input
-PC7.GPIOParameters=GPIO_Label
+PC7.GPIOParameters=GPIO_PuPd,GPIO_Label
 PC7.GPIO_Label=PPG_DRDY
+PC7.GPIO_PuPd=GPIO_PULLUP
 PC7.Locked=true
-PC7.Signal=GPXTI7
+PC7.Signal=GPIO_Input
 PC8.Mode=SD_4_bits_Wide_bus
 PC8.Signal=SDMMC1_D0
 PC9.Mode=SD_4_bits_Wide_bus
@@ -334,17 +358,13 @@ SH.ADCx_IN16.0=ADC1_IN16,IN16-Single-Ended
 SH.ADCx_IN16.ConfNb=1
 SH.GPXTI0.0=GPIO_EXTI0
 SH.GPXTI0.ConfNb=1
-SH.GPXTI3.0=GPIO_EXTI3
-SH.GPXTI3.ConfNb=1
 SH.GPXTI5.0=GPIO_EXTI5
 SH.GPXTI5.ConfNb=1
-SH.GPXTI7.0=GPIO_EXTI7
-SH.GPXTI7.ConfNb=1
 SH.S_TIM2_ETR.0=TIM2_ETR,ClockSourceETR_Mode2
 SH.S_TIM2_ETR.ConfNb=1
-SPI1.BaudRatePrescaler=SPI_BAUDRATEPRESCALER_128
+SPI1.BaudRatePrescaler=SPI_BAUDRATEPRESCALER_64
 SPI1.CLKPhase=SPI_PHASE_2EDGE
-SPI1.CalculateBaudRate=625.0 KBits/s
+SPI1.CalculateBaudRate=1.25 MBits/s
 SPI1.DataSize=SPI_DATASIZE_8BIT
 SPI1.Direction=SPI_DIRECTION_2LINES
 SPI1.IPParameters=VirtualType,Mode,Direction,CalculateBaudRate,DataSize,BaudRatePrescaler,CLKPhase
diff --git a/code/l452_code/packet_parser_serial.py b/code/l452_code/packet_parser_serial.py
index 2904c4b..e1187bb 100644
--- a/code/l452_code/packet_parser_serial.py
+++ b/code/l452_code/packet_parser_serial.py
@@ -4,7 +4,6 @@ from scipy import signal
 import time
 import serial
 
-
 ser = serial.Serial(port = '/dev/ttyACM1', timeout = 10.0)
 ser.reset_input_buffer()
 start = time.time()
diff --git a/code/l452_code/ppg_plotter.py b/code/l452_code/ppg_plotter.py
new file mode 100644
index 0000000..16e7451
--- /dev/null
+++ b/code/l452_code/ppg_plotter.py
@@ -0,0 +1,38 @@
+import serial
+import numpy as np
+import matplotlib.pyplot as plt
+import time
+
+ser = serial.Serial(port = '/dev/ttyACM1', timeout = 10.0)
+ser.reset_input_buffer()
+ser.flush()
+
+
+D = np.zeros((0,3))
+
+fig, axs = plt.subplots(3)
+
+counter = 0
+start = time.time()
+while(1):
+    ser.write(b"R")
+    read_data = ser.read(180)
+    counter += 1
+    p = np.array([int.from_bytes(read_data[3 * i : 3 * i + 3], byteorder = 'big') for i in range(60)]).reshape(20,3)
+    D = np.concatenate((D, p))
+
+    if counter == 30:
+        print(15 * 30 / (time.time() - start))
+        start = time.time()
+        counter = 0
+
+    if D.shape[0] > 400:
+        D = D[-400:,:]
+    
+    axs[0].cla()
+    axs[0].plot(D[:,0])
+    axs[1].cla()
+    axs[1].plot(D[:,1])
+    axs[2].cla()
+    axs[2].plot(D[:,2])
+    plt.pause(0.00001)