Hello community, after “failed” to build a car pc using a normal pc with android OS I decided to do some research regarding khadas.
So, I would like to build a car pc using khadas but I have a problem regarding the power on and off control. I didn’t buy it yet so that’s why I am here.
Before any possible solution I want to mention that my programming skills are near to 0. So I think I would need a hardware solution and I was thinking at 2 options.
First one, khadas has that power button but I don’t know how it works on android. When it’s pressed the pc goes in sleep mode or it’s powering off completely? If it goes in sleep mode I think the best solution for me is to build a circuit board that sends a pulse every time the ignition is on or off, something that simulates the press of the power button. Now, my question is, what is the power consumption in sleep mode?
If the above solution is not possible, I was thinking about using 2 power supplies, one for permanent powering and the other one on ignition. Now the question is, does the pc make the difference between two different power supplies? I mean, I can use vin pins for permanent and the ignition one through an usb port, if khadas make the difference between them( ac charging and usb charging for example) I think I can use an app like Tasker to do some tasks when the second power supply is connected. I’m not so sure if this would work, just an ideea.
So, please tell me how the power button works and if somebody did this before. I’ve read the other topic about this and Dave’s project but I don’t know how that power supply works.