As we had a cold winter time this Season (-10 degree Celsius) and my car was very cold inside every morning althought I have a Garage, I decided to use my Raspberry Pi therefore: A Relais should Switch on a 2kW heater on my request. After breakfast I can Switch on this heather to pre-heat my car with hot ear - even with my smartphone. The heather I put in the car comming home and remove as I drive away. Of Course, the solution is usable only at my home Garage. Works well and since I can start my day without freezing althought I wear just a thin Business Shirt
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Obligatory warning about unattended heater in small spaces causing fire
Now that thatâs over, looks like a pretty cool project! I really like that PCB you have the LEDâs and switch mounted on, where did you get that?
Yes, thatâs a small, cheap prototyping piggy-board: âRaspberry Pi Breakout Board v1.0â from seedstudio.
BTW: My heater has a overheating thermo-Switch inside and an fall-over-Switch to Switch off automatically. I use it in my Porsche Cayenne with the Cayenne Software - isnât funny?
Safety features are good 
There was a project a while back where someone was using Cayenne to monitor growing conditions for peppers. Unfortunately none of them were Cayenne peppers so I think you win. Now all you need to do is get a remote start for your car to get the engine warm too!
Nice Project. Have you considered adding a scheduled event to start the heater so you donât have to do so manually? I suppose that depends on how consistent your daily schedule is
This was in fact the reason for the Project, I often donât know when I have to leave. And I need just 30 minutes warmup only. Else I could use a Standard electrical power timerswitch. Here some photos of both CayennesâŚ
Nice Project. Have you considered adding a scheduled event to start the heater so you donât have to do so manually? I suppose that depends on how consistent your daily schedule is
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Makes sense. Youâll have to wait until we incorporate some sort of machine learning deep AI into Cayenne to read your mind and predict when youâre going 
Very cool project @johannes.mueller!
I hope you donât mind, I posted your project to Cayenneâs Hackster.io page and gave you credit for it.
Car Pre-Heater - Cayenne in a Cayenne - Hackster.io
Cheers! and stay warm
-Benny