Electronics > Microcontrollers

Converting from 7 segment to numbers

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TerminalJack505:
I peeked at the commands that the controller supports a little earlier.  Going the I2C route isn't as bad as I thought it might be.  Given that it reduces the number of required I/O pins greatly, that's probably the way to go.

I've never done it but I don't see why you can't put an MCU on the bus and just have it spy on the communications.

Your MCU's pins would just be input pins so the bus wouldn't be aware of it.  There is the matter of the extra capacitance that you would be adding, however.  Because of this you will want to keep the wires as short as possible.  As a last-resort you might be able to find the two pull-up resistors on the bus and swap them out with smaller value resistors to compensate for the extra capacitance.

Phillips (NXP) developed the I2C bus.  They have good documentation on their website.

David Aurora:
Thanks dude, you're giving me hope  ;D

I'm going to tap into it later on and at least take a look, I think it could save me a high nightmare and a lot of board space. There's a small cavity behind the original LCD that was used for incandescent backlight bulbs, I'm planning to use that for mounting control circuitry. There's a bit of space, but nothing too huge so minimal circuitry is best

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