ACS712 Current Sensor with Blue Pill using STM32CubeIDE

Prerequisites

This project assumes you have already installed STM32CubeIDE. You need to have previously done a basic blink sketch with blue-pill using STM32CubeIDE. I have made a complete video from installing STM32CubeIDE to LED blink program. You can watch it by clicking this link. https://www.youtube.com/watch?v=kXg467nVd_A

Datasheets

Wiring Diagram

STM32CubeIDE Settings

ADC1 - IN9 (tick)

Parameter Settings --> ADC Settings --> Continuous Conversion Mode (Enabled)

Additional code on top of STM32CubeIDE generated code

/* USER CODE BEGIN PV */
uint16_t readValue;
float sensitivity = 0.1; // 0.1 for 20A Model
float rawVoltage;
float current;
/* USER CODE END PV */

  /* USER CODE BEGIN 2 */
  HAL_ADC_Start(&hadc1);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    HAL_ADC_PollForConversion(&hadc1,1000);
    readValue = HAL_ADC_GetValue(&hadc1);
    rawVoltage = (float) readValue * 3.3 * 2 / 4095;
    // If rawVoltage is not 2.5Volt, multiply by a factor.In my case it is 1.035
    // This is due to tolerance in voltage divider resister & ADC accuracy
    current =(rawVoltage - 2.5)/sensitivity;
    HAL_Delay (100);
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */