Controlling a Car Phone Handset With a Microcontroller

I started writing microcontroller code to interact with an old car phone handset, and this is my “hello world” program.

I simulated the original power on sequence, then added some extra stuff to make it obvious that I’m in control.

I will eventually be implementing complete phone functionality and interfacing with a Bluetooth module to delegate the actual phone call stuff to a modern cell phone.

Full details of my project are documented here: https://www.electro-tech-online.com/threads/making-a-bluetooth-adapter-for-a-car-phone-from-the-90s.162764/

The phone is a DiamondTel Model 92.

See this YouTube playlist for more videos about this car phone project: https://www.youtube.com/watch?v=xQxLZcx1VAs&list=PLOlio4FadqvQEWHDXaJHlkvHigROk-RNV

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