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The way you have connected the keypad, it requires in the logic that you make one set of pins input ie A,B,C,D or 1,2,3,4 the other as output, make all out put low, make the output of the key in row/col as high then sense it with the corresponding input or row/col for high voltage. Do this for...
I have not tried Potyo's versions as I am usually using 5V PICs. Potyo's versions are useful if you are using PICs which have different voltages. However, many have built Potyo's versions satisfactorily, I would say all the versions are ok to be built but problems do crop up and you have to...
Actually PIC's version have two files which have been posted by PIC for 4550 one is with mclr being used and the other is where mclr is not supposed to be connected to + through a resistor, it is supposed to be left unconnected.
Which one are you using? I have not used the ICD2 clone with...
Hi, this is my first post here. I had been reading the threads, very interesting, I built the ICD 2 clone. After reading this thread. Based on lothar's LM358 design for 877 and PIC'S FW for mclr disabled. It works fine, only some problems of connecting but connects after a procedure as in icd2...
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