2. Soldering the headers Before using your click board, make sure to solder 1x8 male headers to both left and right side of the board. Two 1x8 male headers are included with the board in the package. 1 Air quality click 2 3 4. Essential features Air quality click is suitable for detecting 1. Introduction ammonia (NH), nitrogen oxides (NOx) 3 benzene, smoke, CO and other harmful or 2 poisonous gases that impact air quality. The MQ-135 sensor unit has a sensor layer made of tin dioxide (SnO ), an inorganic compound 2 which has lower conductivity in clean air Turn the board upside down so that Turn the board upward again. Make sure than when polluting gases are present. Air the bottom side is facing you upwards. to align the headers so that they are quality click also contains a potentiometer Place shorter pins of the header into the perpendicular to the board, then solder that lets you adjust the sensor for the appropriate soldering pads. the pins carefully. environment youll be using it in. Air quality click is a simple solution 3. Plugging the board in for adding a high sensitivity sensor for click detecting a variety of gases that impact Once you have soldered the headers your air quality in homes and offices. The board board is ready to be placed into the desired BOARD features an MQ-135 sensor, a calibration mikroBUS socket. Make sure to align the www.mikroe.com potentiometer, a mikroBUS host socket, cut in the lower-right part of the board two jumpers and a power indicator LED. with the markings on the silkscreen at the Air quality click Manual Air quality click communicates with the mikroBUS socket. If all the pins ver. 1.00 target board through mikroBUS AN (OUT) are aligned correctly, push the line. Air quality click is designed to use a board all the way into the socket. 0 100000 026588 5V power supply only. 6. Calibration potentiometer 5. Air quality click board schematic To calibrate Air quality click for optimum performance, use the on-board potentiom- eter to adjust the load resistance on the sensor circuit. VCC VCC VCC 7. Code examples R1 Analog output A B AN PWM 2K2 Once you have done all the necessary H H RST INT preparations, its time to get your click board CS TX A B SCK RX up and running. We have provided examples SCL MISO for mikroC , mikroBasic and mikroPascal SDA MOSI R2 compilers on our Libstock website. Just +3.3V +5V MQ-135 PWR 10K GND GND download them and you are ready to start. MIKROBUS DEVICE CONN. P1 10K .com 8. Support MikroElektronika oers ff free tech support (www.mikroe.com/support) until the end of the products lifetime, so if something goes wrong, were ready and willing to help MikroElektronika assumes no responsibility or liability for any errors or inaccuracies that may appear in the present document. Specification and information contained in the present schematic are subject to change at any time without notice. Copyright 2014 MikroElektronika. All rights reserved.