[GreenKeys] UART (sort of like) in software on Arduino

[steve bennett]

Forgive me if I am repeating myself but my last last post never showed up as far as I can tell.
45.45 UARTs seem to be harder to come by than they used to be.Here is my suggestion for making your own in Software.
I did a similar thing a few years ago.My aim at the time was to decode signals from a Seeburg Wallbox.(Those Juke box remotes you used to see in restaurant booths.)
The Seeburg sends a stream of 25VAC pulses.These are very slow. I'm guessing even slower than 45.45.What I came up with was a simple opt isolator circuit to change the 25VACpulses to 5VDC.Then programmed an Arduino to decode the 5V pulses.Just a simple polling loop on a GPIO pin to detect ones and zeros.
Here was the result. I'm thinking a similar approach might work for making a teletype interface.
-Steve Seeburg Arduino project progress


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Seeburg Arduino project progress


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