I need help designing my first circuit. I hope it's ok posting here.
I just got a new head unit put in my car with a dvd player, and unfortunately when I disengage the e-brake the video cuts out and my son can't watch from the backseat. I don't want to buy more lcds, and frankly my car is too small for more anyway.
I thought this would be easy, but alas, those clever folks at alpine have the stereo hooked up to both the e-brake and foot brake.
To engage the video I have to 1) engage foot brake 2) release e-brake 3) engage e-brake 4) release foot brake
I think I could easily do this with an arduino... if it weren't for the voltages. 12-14v. I want to make a circuit that I can hook these 2 wires into, press a button, have it alter the current on two leads corresponding to the above sequence.
So I'm hoping you wonderful people here could give me a hand. What do I do about the voltages, first I have to drop the voltage from 12-14 v to the 5-9 range right?
Then I need to set up two circuits that go high/low that I can tap from the head unit. I'm thinking I can just use some transistors to get the voltages correct. what kind of transistors do I use?
any suggestions would be appreciated