ESP8266 (NodeMCU) + CSS811 | CJMCU-811

https://mysku.ru/blog/aliexpress/76702.html

VCC – 3V3

GND – GND

WAK (wakeup) – GND

SCL – D1

SDA – D2

#include <Arduino.h>

/******************************************************************************
Read basic CO2 and TVOCs on alternate Wire ports

Marshall Taylor @ SparkFun Electronics
Nathan Seidle @ SparkFun Electronics

April 4, 2017

https://github.com/sparkfun/CCS811_Air_Quality_Breakout
https://github.com/sparkfun/SparkFun_CCS811_Arduino_Library

Read the TVOC and CO2 values from the SparkFun CSS811 breakout board

This shows how to begin communication with the sensor on a different Wire port.
Helpful if you have platform that is a slave to a larger system and need
a dedicated Wire port or if you need to talk to many sensors at the same time.

A new sensor requires at 48-burn in. Once burned in a sensor requires
20 minutes of run in before readings are considered good.

Hardware Connections (Breakoutboard to Arduino):
3.3V to 3.3V pin
GND to GND pin
SDA to A4
SCL to A5

Resources:
Uses Wire.h for i2c operation

Development environment specifics:
Arduino IDE 1.8.1

This code is released under the [MIT License](http://opensource.org/licenses/MIT).

Please review the LICENSE.md file included with this example. If you have any questions
or concerns with licensing, please contact techsupport@sparkfun.com.

Distributed as-is; no warranty is given.
******************************************************************************/
#include <Wire.h>

#include “SparkFunCCS811.h”

//#define CCS811_ADDR 0x5B //Default I2C Address
#define CCS811_ADDR 0x5A //Alternate I2C Address

CCS811 mySensor(CCS811_ADDR);

void setup()
{
Serial.begin(115200);
Serial.println(“CCS811 Basic Example”);

Wire.begin(); //Compilation will fail here if your hardware doesn’t support additional Wire ports

//This begins the CCS811 sensor and prints error status of .beginWithStatus()
CCS811Core::CCS811_Status_e returnCode = mySensor.beginWithStatus(Wire); //Pass Wire1 into the library
Serial.print(“CCS811 begin exited with: “);
Serial.println(mySensor.statusString(returnCode));
}

void loop()
{
//Check to see if data is ready with .dataAvailable()
if (mySensor.dataAvailable())
{
//If so, have the sensor read and calculate the results.
//Get them later
mySensor.readAlgorithmResults();

Serial.print(“CO2[“);
//Returns calculated CO2 reading
Serial.print(mySensor.getCO2());
Serial.print(“] tVOC[“);
//Returns calculated TVOC reading
Serial.print(mySensor.getTVOC());
Serial.print(“] millis[“);
//Simply the time since program start
Serial.print(millis());
Serial.print(“]”);
Serial.println();
}

delay(10); //Don’t spam the I2C bus
}