Thursday, February 15, 2007

The little problem of RS-232 interfacing...

The turtle wants 0-5V (TTL) serial communications. The AVR butterfly has a level shifter that brings it's UART to RS-232 levels. A simple jumper between the butterfly and turtle would have been nice. Instead I have to look into using the turtles level shifting DIN connector.

But wait! According to this I can use the USI pins to emulate UART. This would be nice. Just 3 plain jumpers between the butterfly and turtle and a lot of tricky software ;-)

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