CCS811 digital gas sensor and Chipkit example

CCS811 is a low-power digital gas sensor solution, which integrates a gas sensor solution for detecting low levels of VOCs typically found indoors, with a microcontroller unit (MCU) and an Analog-to-Digital converter to monitor the local environment and provide an indication of the indoor air quality via an equivalent CO2 or TVOC output over a standard I2C digital interface.

Features

Integrated MCU
On-board processing
Standard digital interface
Optimised low power modes
IAQ threshold alarms
Programmable baseline
2.7mm x 4.0mm LGA package
Low component count
Proven technology platform

Specs

Interface I²C
Supply Voltage [V] 1.8 to 3.6
Power Consumption [mW] 1.2 to 46
Dimension [mm] 2.7 x 4.0 x 1.1 LGA
Ambient Temperature Range [°C] -40 to 85
Ambient Humidity Range [% r.h.] 10 to 95

Parts List

 

Amount Part Type
1 CJMCU-811 CCS811 Air Quality Gas Sensor
1

 

Schematics/Layout

Remember and connect WAKE to gnd

max32 and CCS811
max32 and CCS811

Code

Again we use a library – https://github.com/adafruit/Adafruit_CCS811

And this is the out of the box example

#include "Adafruit_CCS811.h"
Adafruit_CCS811 ccs;
void setup() {
Serial.begin(9600);
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();
if(!ccs.readData()){
Serial.print("CO2: ");
Serial.print(ccs.geteCO2());
Serial.print("ppm, TVOC: ");
Serial.print(ccs.getTVOC());
Serial.print("ppb Temp:");
Serial.println(temp);
}
else{
Serial.println("ERROR!");
while(1);
}
}
delay(500);
}

 

Output

Open the serial monitor – this is what I saw. The higher CO2 level was when I breathed on the sensor

CO2: 400ppm, TVOC: 0ppb Temp:16.95
CO2: 424ppm, TVOC: 3ppb Temp:20.71
CO2: 400ppm, TVOC: 0ppb Temp:22.00
CO2: 427ppm, TVOC: 4ppb Temp:21.48
CO2: 400ppm, TVOC: 0ppb Temp:21.09
CO2: 400ppm, TVOC: 0ppb Temp:19.09
CO2: 445ppm, TVOC: 6ppb Temp:19.58
CO2: 441ppm, TVOC: 6ppb Temp:21.48
CO2: 400ppm, TVOC: 0ppb Temp:22.80
CO2: 400ppm, TVOC: 0ppb Temp:21.48
CO2: 400ppm, TVOC: 0ppb Temp:20.71
CO2: 410ppm, TVOC: 1ppb Temp:16.15
CO2: 420ppm, TVOC: 3ppb Temp:17.30

 

Links

ccs811 datasheet

CJMCU-811 CCS811 Air Quality Gas Sensor

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