Archive:AirCasting Shield

You are visiting an old member project. The information found on "AirCasting Shield" might be out of date. See Environmental Monitor which is the follow up project

     

AirCasting Shield Release status: obsolete [box doku]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

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]