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For some reasons, i'd like to start my car at some specific times (e.g. from 11:00pm to 11:10pm, then from 5:00am to 5:10am). Are there any simple ways of achieving this? I thought of Arduino but I don't have much equipment at hand presently. Maybe a relay activated by two alarm clocks and a timer set on 10min?

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  • \$\begingroup\$ what would the relay operate? \$\endgroup\$ – jsotola Jul 6 '18 at 2:45
  • \$\begingroup\$ An alarm clock can not be hacked like that. You will need some sort of microcontroller. \$\endgroup\$ – Adam Uraynar Jul 6 '18 at 2:55
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    \$\begingroup\$ Or you could do some janky MacGyver trick on a $50 Viper 1-way Remote Start by having a "finger" somehow push down on the start button. \$\endgroup\$ – Adam Uraynar Jul 6 '18 at 3:02
  • \$\begingroup\$ If this is related to temperature - I have a small 400W heater fitted under the bonnet which comes on via a time switch and warms the engine bay nicely ready for the first start of the day. Works well in Switzerland for cold mornings... \$\endgroup\$ – Solar Mike Jul 6 '18 at 5:26
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    \$\begingroup\$ I'm sure some alarm clocks can be hacked like that. Of course it's still more efficient to make your own thingy. \$\endgroup\$ – immibis Jul 6 '18 at 5:44
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You can do this with a remote start kit, a spare key fob, and a switch to let your Arduino (or whatever) "press" the start button on the fob at the desired time.

Wire a spare GPIO on the Arduino to a MOSFET and the contacts in the key fob, and create a program / sketch that toggles the pin at the desired time.

If you don't want to get a remote start kit, you'll wind up having to build basically the same thing, including bypassing the anti-theft system (if present) and/or leaving a key in the ignition. Also, I hope this is for a car with an automatic transmission. You don't want your car charging into the nearest obstacle on its own if you accidentally leave it in gear. (As a manual transmission-equipped car should always be parked.)

I'd also add a way to make sure that the car isn't already running before activating. Maybe add an ADC connected to the tachometer signal, or read from a switched pin in the fuse box?

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