Air quality 2 click
PID: MIKROE-2529
Air quality 2 click carries the iAQ-Core Indoor Air Quality sensor that measures VOC (volatile
organic compounds) levels and provides CO2 equivalent and TVOC (total volatile organic
compounds) equivalent predictions. The click is designed to run on either 3.3V or 5V power
supply. It communicates with the target MCU over I2C.
iAQ‐Core sensor
The sensor is protected by a plastic cap and a filter membrane. This membrane should not be
removed or touched.
The sensing range for CO2 equivalents is from 450 to 2000 ppm (parts per million), and from
125 to 600 ppb (parts per billion) for TVOC equivalents.
Know everything in 5 minute
It takes only 5 minutes for the first functional reading after start up time. After the sensor is
powered on, you don't have to wait for it to calibrate. You'll have all the readings you need in
less time than it takes to make a cup of coffee.
ABC ‐ Automatic Baseline Correction
iAQ-Core sensor has Automatic Baseline Correction (ABC), which means that you don't need to
make any further calibration. You'll be able to use it for many years in a normal indoor
environment.
Low power consumption
With low power consumption (maximum of 9mW in pulsed mode and 66mW in continuous
mode) Air quality 2 click is ideal for Smart Home applications and IoT projects and devices that
require long battery life.
VOC or volatile organic compounds
Volatile organic compounds or VOCs are organic chemicals. They have very high vapor
pressure at room temperature, and some of them can be harmful to human health.
These chemicals are carbon-based (formaldehyde, toluene, benzene, etc.) and they got the name
"volatile" from the fact that they become gases at room temperature.
They are emitted from various products, like hairspray, household cleaning products, paint, or air
freshener, that we use every day.
C02 equivalent
CO2 equivalent or CO2e, represents a unit of measurement for the amount of CO2 present in
some "greenhouse gas".
Key features
iAQ‐Core sensor sensing range:
o 450 – 2000 ppm CO2 equivalents
o 125 – 600 ppb TVOC equivalents
I2C interface
3.3V or 5V power supply
SPECIFICATION
Product Type
Applications
On-board
modules
Gas
Smart Home applications, Internet of Things devices, HVAC, thermostats, etc.
iAQ-Core sensor
Low power consumption, measures VOC levels and provides CO2 equivalent
and TVOC equivalent predictions.
Key Benefits
Reliable evaluation of indoor air quality, high sensitivity and fast response.
Interface
I2C
Power Supply
3.3V or 5V
Compatibility
mikroBUS
Click board size M (42.9 x 25.4 mm)
Key Features
Pinout diagram
This table shows how the pinout on Air quality 2 click corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
Pin
Notes
mikroBUStm
Not connected NC 1 AN
PWM 16 NC Not connected
Not connected NC 2 RST
INT 15 NC Not connected
Not connected NC 3 CS
TX 14 NC Not connected
Not connected NC 4 SCK
RX 13 NC Not connected
Not coneected NC 5 MISO SCL 12 SCL I2C clock
Not connected NC 6 MOSI SDA 11 SDA I2C data
Power supply +3.3V 7 3.3V
5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground
Programming
Code examples for Air quality 2 click, written for MikroElektronika hardware and compilers are
available on Libstock.
The library has a helper function to read the iAQ-Core sensor measurements. The demo
initializes the library, and in an endless loop reads the measurement data, and writes them to the
UART.
Code snippet
The code snippet shows how to initialize the library and use the helper function to read
measurements data from the iAQ-Core sensor.
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static iaq_status_t iaq_status;
static iaq_info_t info;
void main()
{
I2C1_Init_Advanced( 100000, &_GPIO_MODULE_I2C1_PB67 );
air_quality_2_click_init();
iaq_status = air_quality_2_click_info(&info);
while(1);
}
https://shop.mikroe.com/click/sensors/air-quality-2 2/24/2017
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