CCS811 CO2 eCO2

Manual & Vejledning

https://learn.adafruit.com/adafruit-ccs811-air-quality-sensor

https://learn.sparkfun.com/tutorials/ccs811-air-quality-breakout-hookup-guide

Description

Breathe easy - we finally have an I2C VOC/eCO2 sensor in the Adafruit shop! Add air quality monitoring to your project and with an Adafruit CCS811 Air Quality Sensor Breakout. This sensor from AMS is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) and is intended for indoor air quality monitoring. When connected to your microcontroller (running our library code) it will return a Total Volatile Organic Compound (TVOC) reading and an equivalent carbon dioxide reading (eCO2) over I2C. There is also an onboard thermistor that can be used to calculate the local ambient temperature.

The CCS811 has a 'standard' hot-plate MOX sensor, as well as a small microcontroller that controls power to the plate, reads the analog voltage, and provides an I2C interface to read from.

This part will measure eCO2 (equivalent calculated carbon-dioxide) concentration within a range of 400 to 8192 parts per million (ppm), and TVOC (Total Volatile Organic Compound) concentration within a range of 0 to 1187 parts per billion (ppb). According to the fact sheet it can detect Alcohols, Aldehydes, Ketones, Organic Acids, Amines, Aliphatic and Aromatic Hydrocarbons. We include a 10K NTC thermistor with matching balancing resistor which can be read by the CCS811 to calculate approximate temperature.

Please note, this sensor, like all VOC/gas sensors, has variability and to get precise measurements you will want to calibrate it against known sources! That said, for general environmental sensors, it will give you a good idea of trends and comparisons.Also, AMS recommends that you run this sensor for 48 hours when you first receive it to "burn it in", and then 20 minutes in the desired mode every time the sensor is in use. This is because the sensitivity levels of the sensor will change during early use. Finally, this chip uses I2C clock stretching, and some microcontrollers/computers don't support that (e.g. Raspberry Pi)

The CCS811 has a configurable interrupt pin that can fire when a conversion is ready and/or when a reading crosses a user-settable threshold. The CCS811 supports multiple drive modes to take a measurement every 1 second, every 10 seconds, every 60 seconds, or every 250 milliseconds.

For your convenience we've pick-and-placed the sensor on a PCB with a 3.3V regulator and some level shifting so it can be easily used with your favorite 3.3V or 5V microcontroller.

We've also prepared software libraries to get you up and running in Arduino IDE or CircuitPython with just a few lines of code! Check out our tutorial for more information!

CCS811 Sensor Specification

https://ams.com/ccs811

Produkt Link

https://www.adafruit.com/product/3566

https://www.amazon.de/gp/product/B07912JQK7/

Specifikationer

• Total Volatile Organic Compound (TVOC) sensing from 0 to 1,187 parts per billion
• eCO2 sensing from 400 to 8,192 parts per million
• Five Operating Modes
• Integrated MCU
• Onboard Processing
• Standard I2C Digital Interface
• Optimized Low-Power Modes
• Optional NTC Thermistor Pins

Sample Code

/******************************************************************************

BasicReadings.ino

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 is the simplest example. It throws away most error information and

runs at the default 1 sample per second.

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 "SparkFunCCS811.h"

#define CCS811_ADDR 0x5B //Default I2C Address

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

CCS811 mySensor(CCS811_ADDR);

void setup()

{

Serial.begin(9600);

Serial.println("CCS811 Basic Example");

//It is recommended to check return status on .begin(), but it is not

//required.

CCS811Core::status returnCode = mySensor.begin();

if (returnCode != CCS811Core::SENSOR_SUCCESS)

{

Serial.println(".begin() returned with an error.");

while (1); //Hang if there was a problem.

}

}

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

}