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
Code
Again we use a library – https://github.com/adafruit/Adafruit_CCS811
And this is the out of the box example
[codesyntax lang=”cpp”]
#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);
}
[/codesyntax]
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