diff --git a/fw/Core/Src/main.c b/fw/Core/Src/main.c
index 28b6b3c..eda6b45 100644
--- a/fw/Core/Src/main.c
+++ b/fw/Core/Src/main.c
@@ -54,7 +54,7 @@ static void MX_GPIO_Init(void);
 static void MX_ADC1_Init(void);
 static void MX_USB_PCD_Init(void);
 /* USER CODE BEGIN PFP */
-
+uint16_t ADC_ReadChannel(uint32_t channel);
 /* USER CODE END PFP */
 
 /* Private user code ---------------------------------------------------------*/
@@ -103,9 +103,22 @@ int main(void)
   while (1)
   {
     /* USER CODE END WHILE */
-    state = state == GPIO_PIN_RESET ? GPIO_PIN_SET : GPIO_PIN_RESET;
+    // Read voltages before and after current limiting resistor (R22, 10 ohm)
+    uint16_t val_ch0 = ADC_ReadChannel(ADC_CHANNEL_0);
+    uint16_t val_ch1 = ADC_ReadChannel(ADC_CHANNEL_1);
+    // Convert to voltage (12-bit, 3.3V reference)
+    float voltage_ch0 = (val_ch0 * 3.3f) / 4095.0f;
+    float voltage_ch1 = (val_ch1 * 3.3f) / 4095.0f;
+
+    // simple regulation
+    const float target_voltage = 3.0f;
+    if (voltage_ch0 < target_voltage)
+    {
+      state = GPIO_PIN_SET;
+    } else {
+      state = GPIO_PIN_RESET;
+    }
     HAL_GPIO_WritePin(VDD_LEDL_EN_GPIO_Port, VDD_LEDL_EN_Pin, state);
-    HAL_Delay(50);
     /* USER CODE BEGIN 3 */
   }
   /* USER CODE END 3 */
@@ -294,7 +307,38 @@ static void MX_GPIO_Init(void)
 }
 
 /* USER CODE BEGIN 4 */
+uint16_t ADC_ReadChannel(uint32_t channel)
+{
+    ADC_ChannelConfTypeDef sConfig = {0};
 
+    // Configure the specific channel
+    sConfig.Channel = channel;
+    sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
+    if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
+    {
+        Error_Handler();
+    }
+
+    // Start conversion
+    if (HAL_ADC_Start(&hadc1) != HAL_OK)
+    {
+        Error_Handler();
+    }
+
+    // Poll for completion (timeout 10ms)
+    if (HAL_ADC_PollForConversion(&hadc1, 10) != HAL_OK)
+    {
+        Error_Handler();
+    }
+
+    // Get result
+    uint16_t adc_value = HAL_ADC_GetValue(&hadc1);
+
+    // Stop ADC
+    HAL_ADC_Stop(&hadc1);
+
+    return adc_value;
+}
 /* USER CODE END 4 */
 
 /**