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 Hydrogen click 4. Essential features 2 3 Hydrogen click can detect hydrogen levels in concentrations from 100 to 10000ppm. 1. Introduction The MQ-8 hydrogen sensor has a sensor layer made of tin dioxide (SnO ), an inorganic 2 compound which has lower conductivity in clean air. The conductivity increases as the levels of hydrogen rise. Hydrogen click also contains a potentiometer that lets you Turn the board upside down so that Turn the board upward again. Make sure adjust the sensor for the environment youll the bottom side is facing you upwards. to align the headers so that they are be using it in. For precise calibration the Place shorter pins of the header into the perpendicular to the board, then solder sensor needs to preheat (once powered up, appropriate soldering pads. the pins carefully. it takes 24h to reach the right temperature). Hydrogen click is a simple solution for adding a high sensitivity hydrogen 3. Plugging the board in (H ) sensor to your design. Its suitable 2 click for designing gas leakage equipment. Once you have soldered the headers your The board features an MQ-8 sensor, a board is ready to be placed into the desired BOARD calibration potentiometer, a mikroBUS mikroBUS socket. Make sure to align the www.mikroe.com socket and a power indicator LED. cut in the lower-right part of the board with Hydrogen click communicates with the the markings on the silkscreen at the Hydrogen click Manual target board through mikroBUS AN mikroBUS socket. If all the pins ver. 1.00 (OUT) line. Hydrogen click is designed are aligned correctly, push the to use a 5V power supply only. board all the way into the socket. 0 100000 026830 5. Hydrogen click board schematic 6. Calibration potentiometer To calibrate hydrogen click for optimum performance, use the on-board potentio- meter to adjust the load resistance of the sensor circuit. VCC VCC VCC 7. Code examples Analog output R1 A B AN PWM 2K2 H1 H2 RST INT Once you have done all the necessary CS TX preparations, its time to get your click board A B SCK RX up and running. We have provided examples MISO SCL for mikroC , mikroBasic and mikroPascal SDA MOSI R2 +3.3V +5V compilers on our Libstock website. Just MQ-8 PWR 470 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.