Doubt regarding why read pin is not working when it's set.

[Killstreet30]

Hello.

Find the attached circuit diagram for my IR sensor. The trigger is built in such a way that when it's off the IR transmitter is off and we get the sunlight values and when it's on we get sunlight + IR value and when we subtract the two we get the resultant. But my code doesn't dsiplay any value when the IR transmitter is on. Here's my code. Please help. When I add a breakpoint it never gets triggered by the if loop where the trigger or pin 9 is set.

HAL_TIM_Base_Start_IT(&htim3);

 /* USER CODE END 2 */

 /* Infinite loop */

 /* USER CODE BEGIN WHILE */

 while (1)

 {

 HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_9);

 HAL_Delay(1000);

 if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_9) == GPIO_PIN_SET){

    HAL_ADC_Start(&hadc1);

    HAL_ADC_PollForConversion(&hadc1, 100);

    ir = HAL_ADC_GetValue(&hadc1);}

 else if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_9) == GPIO_PIN_RESET){

        HAL_ADC_Start(&hadc1);

        HAL_ADC_PollForConversion(&hadc1, 100);

        sunlight = HAL_ADC_GetValue(&hadc1);}

 res = ir - sunlight;

[Javier1]

Are you trying to read and write from the same GPIO?

How did you configured gpio A-9, output or input?

I recommend this for you https://www.youtube.com/watch?v=vdY0VN21ZOI

[gbm]

I'll be surprised if it works. Normally the photodiode has much too small current to be sampled by ADC, unless you direct a laser light onto it. For light intensity sensing without an amplifier use phototransistor or LDR. For IR remote reception - use a dedicated circuit, like TSOP1836.