Great, thanks!
What did you use for the ignition input? Was it a 12v signal through the access controller?
Awesome project btw
Not sure what you are asking. The 12V ignition signal was picked off the cigarette lighter I think. Really you can pick it from anywhere. Put it through a voltage divider and to the input pin on the Seeeduino.
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Ah sorry I wasn’t sure if there was some sort of ignition signal from the fob or if it was hard wired to the vehicle. Thanks!
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Ahh got you. No the ignition sense is hardwired to the vehicle.
A battery line powers the xAC and the Seeeduino.
The ignition like just goes (not directly) to a digital input put to sense when it’s on.
Both are hardwired to the car.
The fob has it’s own discrete connections between the Seeeduino and the fob
- Lock: two wires, one for each side of the lock switch
- Unlock: two wires, one for each side of the lock switch
- Power: 2 wires, 3.3v and ground
Probably easier if I just upload this, it’s pretty rough though. Ignore the upper drawing.
Camaro Access Control Module.pdf (696.6 KB)
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Hey looking to do something similar with an ND Miata. First problem I’ve found is trying to find information on the wiring of the vehicle. I’d like to grab power from the battery and then have some way to know if the car is on or not.
Where did you get that information from? Never done any custom work to a car before.
Factory service manual. Many of the aftermarket service manuals include wiring diagrams, but I find they are never better than the factory service manual. But the factory manual is usually stupid money. The one for the camaro is $450 and comes on a USB drive. For that money it should be printed and come with someone to turn the pages for me… Fortunately GM has a $20 limited time access option… and they let you download PDFs of specific pages so I downloaded everything I needed for $20.
How’d you figure out the key schematic? manual or trial and error/ you knew what you were looking for?
namely for power
Like the Key fob? I just followed the traces on the PCB.
Gotcha, Think I’m going to start a thread documenting my journey. Feels like I’m going to need the help lol
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Which transistors did you use and could you please please give me a breif description of why? new to small electronics.
Right so here is what a transistor does, in the image below Q1 Is the transistor:
NPN transistors are used when you have a positive activation I.e. when you drive the pin high (in this case by and arduino) to turn on.
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In reply to this… it’s been about a month and I now get what these do, and holy shit… transistors are like the swiss army knife of electronics. I’ve decided I like them.
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Fun fact: Modern high end PC CPUs have around 3-4 billion transistors in them.
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Graphics cards are even more intense. The RTX 3080 has 28.3 billion…
Fun fact, thermionic valves can be used to perform the same tasks as transistors, but MUCH bigger. 
Are you the person in my EE101 class that answered the professor’s first-day question saying “electromotive force” instead of “voltage”? 
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I do have a Physics degree, so if I had been in that class it would have been me.
As for @darthdomo, Scottish is never unintelligible. 