Signal Light Controller

A single controller can control eight signal lamps. This, somehow, feels like a waste of a PIC. There are several possible options here. One option is to connect 3 lines of the PIC to a 3 to 8 decoder and use one line as a strobe. This can control eight 4 bit latches giving control of 32 signal lines. The signal lights will use LEDs allowing the latches to directly drive them.

The signals controller responds to the following commands. 

  Command    Function
  ---------  ---------------------------------
  0100 0000  Poll(respond with 2 status bytes)
  001p pppp  Turn signal ppppp on
  011p pppp  Turn signal ppppp off
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Updated on 2 Nov 95. Feedback to