diff --git a/Software/Core/Src/main.c b/Software/Core/Src/main.c
index 08b8d59..6d7bd24 100644
--- a/Software/Core/Src/main.c
+++ b/Software/Core/Src/main.c
@@ -60,6 +60,9 @@ FDCAN_TxHeaderTypeDef txHeader;
 // Declare buffer in AXI SRAM
 static uint16_t adc_values[NUM_ADC_PINS];
 static uint8_t  dio_values[NUM_DIO_PINS];
+#ifdef SN_FRONT
+static uint8_t  ls_values[2];
+#endif /* SN_FRONT */
 
 static uint16_t filtered_values[NUM_ADC_PINS];
 
@@ -85,12 +88,23 @@ void send_latest_can() {
 
   tx_counter++;
 
+  #if defined(SN_FRONT)
+  memcpy(dio_values, ls_values, 2);
+  memset(ls_values, 0, 2);
+  for (int di = 2; di < NUM_DIO_PINS; di++) { //TODO: find way to make this dependent on mappings
+    dio_values[di] = HAL_GPIO_ReadPin(
+      DIO_PIN_MAP[di].port,
+      DIO_PIN_MAP[di].pin
+    );
+  }
+  #elif defined(SN_REAR)
   for (int di = 0; di < NUM_DIO_PINS; di++) {
     dio_values[di] = HAL_GPIO_ReadPin(
       DIO_PIN_MAP[di].port,
       DIO_PIN_MAP[di].pin
     );
   }
+  #endif /* SN_FRONT */
 
   for (int pi = 0; pi < NUM_TX_PKT; pi++) {
 
@@ -158,6 +172,16 @@ void filter_adc() {
   }
 }
 
+#ifdef SN_FRONT
+void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) {
+  if (GPIO_Pin == DIO_PIN_MAP[CAN_SIGNAL_MAP[0].signals[0].channel].pin) {
+    ls_values[1] = 1;
+  } else if (GPIO_Pin == DIO_PIN_MAP[CAN_SIGNAL_MAP[0].signals[1].channel].pin) {
+    ls_values[0] = 1;
+  }
+}
+#endif /* SN_FRONT */
+
 /* USER CODE END 0 */
 
 /**
@@ -202,6 +226,36 @@ int main(void)
   /* Initialize interrupts */
   MX_NVIC_Init();
   /* USER CODE BEGIN 2 */
+
+  // Enable Interrupts for Light Switch Pins
+#ifdef SN_FRONT
+  // check if pin name is "LS L"
+  if (strcmp(CAN_SIGNAL_MAP[0].signals[0].name, "LS L") != 0
+   || strcmp(CAN_SIGNAL_MAP[0].signals[1].name, "LS R") != 0
+  ) {
+    Error_Handler();
+  }
+
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
+  GPIO_InitStruct.Pin = CAN_SIGNAL_MAP[0].signals[0].channel;
+  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
+  GPIO_InitStruct.Pull = GPIO_NOPULL;
+  HAL_GPIO_Init(DIO_PIN_MAP[CAN_SIGNAL_MAP[0].signals[0].channel].port, &GPIO_InitStruct);
+  GPIO_InitStruct.Pin = CAN_SIGNAL_MAP[0].signals[1].channel;
+  HAL_GPIO_Init(DIO_PIN_MAP[CAN_SIGNAL_MAP[0].signals[1].channel].port, &GPIO_InitStruct);
+
+  // Did not find a way to make this dependent on mappings,
+  // since the EXTI lines are shared for pins 10-15
+  // so i just error if the pins are not 10, 15
+  if (DIO_PIN_MAP[CAN_SIGNAL_MAP[0].signals[0].channel].pin != GPIO_PIN_10
+   || DIO_PIN_MAP[CAN_SIGNAL_MAP[0].signals[1].channel].pin != GPIO_PIN_15
+  ) {
+    Error_Handler();
+  }
+
+  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 0, 0);
+  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);
+#endif /* SN_FRONT */
   
   hMainCAN = &hfdcan1;
   hPeriCAN = &hfdcan2;