Hi, ive found on web many project of datalogger controlled by parallel port a A/D converter and a 16 multiplexer . The limit see to be the only 4 bit of the parallel port that can control a 16 channel only MUX(4067)
Somebody has some idea for having 24 channel read via Parallel port?
Tyhanks in avance.
Sure. Instead of trying to select a port by way of the command bits, just use them to control an "address" and a "data" port. Do two writes (well, four, actually) - toggle one of the control bits to indicate "address," and strobe out a number from 00h-FFh. That's
256 ports. Having selected a port, toggle the control bit to "data", and send the data. (or turn the port around and read the data, if it's one o' them newfangled bidirectionsl parallel port thingies. ;-) )Using the resultant 8 bits of "address" to actually address your 256 ports is, as usual, left as an exercise for the student. ;-D
Good Luck! Rich
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