hey i want to read a temperature sensor and a humidity sensor i want to send the values via cdc to my pc and then read them in c# windows forms my question is now how can i read two adc at the same time so i have separate data ? here you have my stm code

[MSchmutz]

 while (1)

 {

  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */

  HAL_ADC_Start(&hadc2);

  HAL_ADC_Start(&hadc1);

if (HAL_ADC_PollForConversion(&hadc2, 10) == HAL_OK)

{

 adcValTemp = HAL_ADC_GetValue(&hadc2);

 // Temperature Calculation

 adcTemp = (3300 * adcValTemp) / 4096;

 Temp = (adcTemp - 2636) / -13.6;

   //itoa(adcValTemp, string_adcValTemp, 10);

   //CDC_Transmit_FS(string_adcValTemp, strlen((const char*)string_adcValTemp));

 CDC_Transmit_FS(adcValTemp, sizeof(adcValTemp));

}

  HAL_Delay(500);

if (HAL_ADC_PollForConversion(&hadc1, 10) == HAL_OK)

{

 adcVal = HAL_ADC_GetValue(&hadc1);

   itoa(adcVal, string_adcVal, 10);

   CDC_Transmit_FS(string_adcVal, strlen((const char*)string_adcVal));

}

  HAL_Delay(500);

 }

[MSchmutz]

here i also go the c# code

  public partial class Form1 : Form

  {

    string inbuffer;

    public Form1()

    {

      InitializeComponent();

      serialPort1.Open();

    }

    private void DisplayText(object sender, EventArgs e)

    {

      label1.Text = Convert.ToString(inbuffer);

    }

    private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)

    {

      inbuffer = serialPort1.ReadExisting();

      this.Invoke(new EventHandler(DisplayText));

    }

  }

}

[TDK]

Read both values and send them at the same time within the same USB packet. In your reception program, you will need to unpack them again in the proper order.

[MSchmutz]

could you do me a little example ? i dont get it thanks :D

[MM..1]

In your code you mix value types ... binary data send ... ascii data send

adcValTemp = HAL_ADC_GetValue(&hadc2);
...
CDC_Transmit_FS(adcValTemp, sizeof(adcValTemp));

Too you say how can i read two adc at the same time,

but used code differ. For same moment measure you need triggered ADC not polled, and wait read result in IT or DMA mode....