【Infineon XENSIV PAS CO2 sensor】Arduino routine test

dql2016

【Infineon XENSIV PAS CO2 sensor】Arduino routine test [Copy link]

Last time I built a test circuit on a breadboard https://en.eeworld.com/bbs/thread-1223050-1-1.html and found that I couldn't read the sensor data. After being pointed out by netizens, it might be the unreliable Dupont line. I took the time to draw a simple Arduino Uno R3 interface compatible expansion board:

The 5V to 12V power module uses a high-end DCDC module (100+ dollars) that MPS offers for free. The effect of the module being plugged into the expansion board is as follows:

Tested using esp32s3 development board:

Test code, using IO17 and IO18 as I2C interface:

#include <Arduino.h>
#include <pas-co2-ino.hpp>

#define I2C_FREQ_HZ  100000                     
#define PERIODIC_MEAS_INTERVAL_IN_SECONDS  10 
#define PRESSURE_REFERENCE  900
#define I2C_SDA 17
#define I2C_SCL 18

PASCO2Ino cotwo;

int16_t co2ppm;
Error_t err;

void setup()
{
    Serial.begin(9600);
    delay(800);
    Serial.println("serial initialized");

    /* Initialize the i2c interface used by the sensor */
    Wire.begin(I2C_SDA, I2C_SCL,I2C_FREQ_HZ);
    //Wire.setClock(I2C_FREQ_HZ);

    /* Initialize the sensor */
    err = cotwo.begin();
    if(XENSIV_PASCO2_OK != err)
    {
      Serial.print("initialization error: ");
      Serial.println(err);
    }

    /* We can set the reference pressure before starting 
     * the measure 
     */
    err = cotwo.setPressRef(PRESSURE_REFERENCE);
    if(XENSIV_PASCO2_OK != err)
    {
      Serial.print("pressure reference error: ");
      Serial.println(err);
    }

    /*
     * Configure the sensor to measureme periodically 
     * every 10 seconds
     */
    err = cotwo.startMeasure(PERIODIC_MEAS_INTERVAL_IN_SECONDS);
    if(XENSIV_PASCO2_OK != err)
    {
      Serial.print("start measure error: ");
      Serial.println(err);
    }

    delay(1000);
}

void loop()
{
    /* Wait for the value to be ready. */
    delay(PERIODIC_MEAS_INTERVAL_IN_SECONDS*1000);

    err = cotwo.getCO2(co2ppm);
    if(XENSIV_PASCO2_OK != err)
    {
      /* Retry in case of timing synch mismatch */
      if(XENSIV_PASCO2_ERR_COMM == err)
      {
        delay(600);
        err = cotwo.getCO2(co2ppm);
        if(XENSIV_PASCO2_OK != err)          
        {
          Serial.print("get co2 error: ");
          Serial.println(err);
        }
      }
    }

    Serial.print("co2 ppm value : ");
    Serial.println(co2ppm);

    /*
     * Assuming we have some mechanism to obtain a
     * pressure reference (i.e. a pressure sensor),
     * we could compensate again by setting the new reference. 
     * Here we just keep the initial value.
     */
    err = cotwo.setPressRef(PRESSURE_REFERENCE);
    if(XENSIV_PASCO2_OK != err)
    {
      Serial.print("pressure reference error: ");
      Serial.println(err);
    }
}

This time we got the correct result, and the sensor outputted the carbon dioxide content data:

appendix

test.rar (1.01 KB, downloads: 0)

2022-11-27 21:47 上传

点击文件名下载附件

I will try to port the Arduino version driver to the STM32 or CH32 platform when I have time.

秦天qintian0303

It's really luxurious. Just put a boost module on it.

dql2016

Qintianqintian0303 posted on 2022-12-1 16:47 It's really luxurious. Just put a boost module at will

Expensive ones are more fragrant

lidonglei1

Does the OP still have the CO2 sensor? Can you give it to me to play with?