Archive:AirCasting Shield

     

AirCasting Shield Release status: obsolete [box doku]
Description	Arduino shield for AirCasting
Last Version	Rev. 01
Download	https://github.com/tiefpunkt/AirCasting-Shield

Deprecated: See Environmental Monitor which is the follow up project

Arduino Shield for AirCasting. Simpler than their wiring mess.

Revision 1

Hardware

• Sensors: SHT22, MQ-7, MQ-135
  • Proper heater drive for MQ-7, thanks to Citizen Sensor [1]
• Board: Prototype milled at OHM2013

• Issues:
  • 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

Software

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.

Pictures

Revision 2

Phase: Planning

• Can keep DHT22 sensors
• Should switch so electrochemical sensors for gases.
  • Nemoto NAP-505 [2]
  • Figaro TGS5342 [3]
  • e2v EC4-500-CO [4]