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Custom Remote Start - Thermostat?


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eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: March 30, 2019 at 7:41 AM / IP Logged Link to Post Post Reply Quote eguru
A "one-wire" temperature sensor connected to a microcontroller (Arduino or rPi), the fob, plus 3 relays (one to simulate the button press, one for the ACC over-ride to ignition circuit, one for shutdown function) would be all that is required. The timing and temperature control SP's and logic could be anything you specify.
The UI (to activate the start function and adjust SP's, etc) could be a Smartphone AP via a BT link to the microcontroller.
I have done my own Android AP's for similar purposes - not too hard. For Apple devices - IDK.
iskidoo 
Silver - Posts: 1,040
Silver spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: December 08, 2002
Location: Maine, United States
Posted: March 30, 2019 at 11:04 AM / IP Logged Link to Post Post Reply Quote iskidoo
I don’t know anything about arduino and raspberry pi tech but it seems like a pretty good idea. If you wanted to use your original idea with the Compustar unit, there are some fine tuning options that may make it work. This would still require setting the mode on after each time the vehicle is driven. I looked through the Compustar DC3 install manual for the brain that is in my truck and observed some temp probe calibration settings. You said that the lowest hot start default temp of 77 is too high. What if you calibrated the temp sensor probe 3 degrees out to make it think it was 77 when it was actually 74 degrees.
Custom Remote Start - Thermostat? - Page 2 - Last Post -- posted image.
Custom Remote Start - Thermostat? - Page 2 - Last Post -- posted image.
Steve G
brcidd 
Copper - Posts: 274
Copper spacespace
Joined: January 07, 2005
Location: Ohio, United States
Posted: April 01, 2019 at 3:49 AM / IP Logged Link to Post Post Reply Quote brcidd
here is what I did- which could be adapted to your needs
neat little remote start project
Brcidd - Engineer That Does Remote Starter Installs on the side.
iskidoo 
Silver - Posts: 1,040
Silver spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: December 08, 2002
Location: Maine, United States
Posted: April 01, 2019 at 11:20 AM / IP Logged Link to Post Post Reply Quote iskidoo
I actually forgot about these little 556T units that do pretty much what you want in conjunction with a remote starter. I had one in my moms car on a daily timed start but I forgot that it has temperature start mode as well. Unfortunately these were discontinued by the manufacturer. Maybe some of these could still be found. They could be out there lost in the back of some installer’s old inventory rack.
556T Owners Guide
556T install guide
Custom Remote Start - Thermostat? - Page 2 - Last Post -- posted image.
Steve G
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