Finally I finished my first Arduino project: A SMS remote for controlling my cars Webasto petrol heater. While I was at it, I added some extras: GPS, Temperature, Humidity, Volt-meter.
I can turn on/off heater, set desired heater-time, set desired cabin temperature, turn on/off extra relay, check temperature/humidity, check battery voltage, check GPS location and speed of car. All by SMS
I used:
Arduino Uno,
DHT22
2 channel isolated relay board
GSM module micro:bit Accessories Store | ELECFREAKS,
Skylab GPS http://www.ebay.co.uk/itm/Skylab-GPS-Module-MT3329-SKM53-with-Embedded-GPS-Antenna-Arduino-Compatible-l-/301366918787?pt=LH_DefaultDomain_3&hash=item462ade3e83
Total spent was about 80$
I mounted it all inside an old car stereo, as I had an extra ISO slot in my car. It was easy to wire to my heater, it just needs a positive on a single wire to turn on. Other heaters probably needs a CAN-BUS signal, or the original on/off button can probably be hacked
More details in ino file.
[EDIT] ino file removed. See post below with fixes and updated sketch.
