CCS811 reading Error 2

Troubleshooting
1

Hello everyone.

I’m trying to read from a CCS811 sensor. Unfortunately I keep getting error code 2 whenever I try to read.

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Here is my code:

/***************************************************************************
  This is a library for the CCS811 air 
  This sketch reads the sensor
  Designed specifically to work with the Adafruit CCS811 breakout
  ----> http://www.adafruit.com/products/3566
  These sensors use I2C to communicate. The device's I2C address is 0x5A
  Adafruit invests time and resources providing this open source code,
  please support Adafruit andopen-source hardware by purchasing products
  from Adafruit!
  Written by Dean Miller for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ***************************************************************************/

SYSTEM_MODE(MANUAL);
SYSTEM_THREAD(ENABLED);

#define CCS811_WAKE C2

#include "Adafruit_CCS811.h"

Adafruit_CCS811 ccs;

void setup() {
  Serial.begin(115200);

  delay(5000);

  pinMode(CCS811_WAKE, OUTPUT);
  digitalWrite(CCS811_WAKE, LOW);
  
  Serial.println("CCS811 test");
  
  if(!ccs.begin()){
    Serial.println("Failed to start sensor! Please check your wiring.");
    while(1);
  }

  //calibrate temperature sensor
  while(!ccs.available());
  float temp = ccs.calculateTemperature();
  ccs.setTempOffset(temp - 25.0);
}

void loop() {
  if(ccs.available()){
    float temp = ccs.calculateTemperature();

    int ret = ccs.readData();
    if(ret == 0){
      Serial.print("CO2: ");
      Serial.print(ccs.geteCO2());
      Serial.print("ppm, TVOC: ");
      Serial.print(ccs.getTVOC());
      Serial.print("ppb   Temp:");
      Serial.println(temp);
    }
    else{
      Serial.printlnf("ERROR! %d", ret);
      //while(1);
    }
  }
  delay(500);
}

Output received over serial:

CCS811 test
ERROR! 2
ERROR! 2
ERROR! 2
ERROR! 2
ERROR! 2
...

EDIT:
I might be seeing this error because I didn’t give the sensor enough time to heat up. I’ll do more testing.

2

Update:
I was able to get the sensor working by switching to the sparkfun ccs811 library.

3

@nrobinson2000 Good to hear you got it working. I had the same problem and in the end started from scratch and wrote a library for the CCS811. This was about 18 months ago. Have you fitted the thermistor? It was an option on the board/module I purchased and is well worthwhile fitting.

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