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#1
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Help muxing devices
I am a bit of a hack at this and need some help if anyone has experience
with attaching devices to the parallel (aka printer) port. I have 3 devices which I would like to read in a round robin approach. My current program just reads 1 device, changing it to read 3 is a snap. It reads the serial info off of pin 6 of an ADC0831 via pin 12 on the RS232. The other pins used are 1, 3 (optional) and 4 of the ADC. My reasoning was ;^) to connect all the ADCs in parallel except pin 6 which I was going to connect to one of the switched in a CD4053 mux input and connect their outputs together to pin 12 of the RS232. Then I realized I might be messing up my parallel port with more than 1 chip. 1) will the parallel port be overloaded with this scheme? 2) will there be enough oomph to carry the signals to all 3 of the ADCs? If you have experience using the SB sound line in can you tell me if a 3 v zener is enough to protect the board if a signal should go to say 4-5 volts? Thanks for your input, Ron |
#2
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Keep in mind that ADC have a settling time and you cannot exceed that,
otherwise the summing circuit will not give you an accurate sample, that will limit your mux circuit Paul |
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