I am doing a temperature-controlled fan, which means that the fan speed will depend on the temperature. I use PWM and PID in this code. My LCD have shown the temperature and humidity but the fan does not work. Can someone explain to this?
int main(void) { /* USER CODE BEGIN 1 */ /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_I2C1_Init(); MX_TIM4_Init(); /* USER CODE BEGIN 2 */ HAL_TIM_Base_Start(&htim4); lcd_init(); //initialize lcd lcd_send_string("INITIALIZING.."); //display string on lcd HAL_Delay(1000); //wait for 1 seconds lcd_clear(); HAL_TIM_PWM_Start(&htim4, PWM_CHANNEL); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { HAL_GPIO_WritePin(FAN_PORT, FAN_PIN, GPIO_PIN_RESET); /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ //Calculate temperature error temp_error = temp_setpoint - Temperature; //Update PWM duty cycle based on temperature error update_pwm_duty_cycle(temp_error); Display_Temp(Temperature); Display_Rh(Humidity); /*******DHT11*********/ DHT11_Start(); Presence = DHT11_Check_Response(); //record the response from the sensor //Five bytes of data Rh_byte1 = DHT11_Read (); Rh_byte2 = DHT11_Read (); Temp_byte1 = DHT11_Read (); Temp_byte2 = DHT11_Read (); SUM = DHT11_Read (); TEMP = Temp_byte1; RH = Rh_byte1; Temperature = (float) TEMP; Humidity = (float) RH; HAL_Delay(1200); } /* USER CODE END 3 */ }