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You are visiting an old member project. The information found on "AirCasting Shield" might be out of date. See Archive:Environmental Monitor which is the follow up project
Release status: obsolete [box doku]
|Description||Arduino shield for AirCasting|
|Last Version||Rev. 01|
Arduino Shield for AirCasting. Simpler than their wiring mess.
- Sensors: SHT22, MQ-7, MQ-135
- Proper heater drive for MQ-7, thanks to Citizen Sensor 
- Board: Prototype milled at OHM2013
- MQ-* sensors didn't fit into their holes -> holes to small. Also pads to small, soldering was a pain and required some hacking to the board.
- Relais fairly loud.
- Sensors get quite warm
Arduino firmware, using some DHT22 Tutorial and this MQ-7 Library (with a few changes to fix stuff) for proper heater driving.
- DHT22 returns legit data
- MQ135 could be legit
- MQ7 is oddly low.
- Both gas sensors can't report real ppm values, as they would have to be calibrated.
- Bluetooth works fine.