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look like i had to use a MCU.. its going to be tough i think.. anyway with or without i can't imagine testing 100 wires using 3 to 8 decoder.. i mean how to connect the wires to the decoder..? i will try to think it up
hi,
Do you really mean 'all 100 at the same time' or would sequential testing be acceptable.?
You should also define the test current and voltage required.
i counted 18 decoders in 2 stages (using 3line to 8 line decoders)
16 decoders in the second stage (16 x 8 = 128 wires can be tested) with the select inputs of all these 16 decoders shorted together
and 2 decoders in first with the select inputs shorted together
so we have 6 select lines - 3 from stage 1 and 3 from stage 2
each decoder in the first stage controls the enable inputs of 8 decoders in the second stage
the enable inputs of the 2 decoders first stage are controlled with i/o lines from the MCU
six more i/o lines are needed three for first stage select inputs (msb) and 3 for second stage select inputs (lsb)
hope it is clear enough - let me know if you need any other details
yes.. it can be sequential.. i don't know about test current or voltage.. any will do.. i supposed..
Thanks Boncuk.. i try to find that kit you will saying.. as for using MCU.. i cant write program.. i will appeciate if i don't need to use a MCU, i don't mind if the circuit is big.. anyway thanks..
An FPGA would do the trick. How is your VHDL?
i got a question to ask.. how can i output a sentences to the LCD if the sentence contain a value from the working register
example: if i want to write "Wire 'w' Pass" and the w is represented by the value 0 to 127
thanks