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April 19, 2014
Chances are you got the wiring wrong.
This can be implemented with a binary counter like 74HC393, so you don’t have to tie up the processor time of a microcontroller. Connect the GRAY wire from the Coin Acceptor to one of the inputs of the 74HC393, then program the Coin Acceptor to use 1, 2 and 4 pulses for the three different coins. This will output 0001, 0010, or 0100 from the binary counter pins. If you have a microcontroller, you can just check the state of these three pins on the 74HC393, and the microcontroller can do other stuff than just check for pulses.
In the schematic they are pulled to Vdd with a 100k resistor, so that’s correct.
What is the point of the buffered I/O’s, as opposed to using the GPIO’s directly? What does the “buffering” do?
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