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Topic: analog multiplexing and sensors (Read 772 times) previous topic - next topic

warp

hi all,

do you believe there will be latency issues if you combine 8 sensors in a single analog input (using multiplexer) ?

has anyone tried?

I assume latency is not a problem if you use faders or pots with multiplexers...
but what about sensors?

thanks,
warp

MikMo

What kind of sensors ?

If they put out a voltage you read from an analog input, it is the same as reading a potentiometer.

I have used 16 potentiometers on 2 multiplexed analog inputs and had no problems with latency.

warp

hi MikMo,

it's good to hear you had no problem...

I's just thinking it might be a problem in a real-situation, say an installation, where all the voltages will change rapidly and continuously.

did you use the multiplexers with potentiometers or sensors?


MikMo

I use 16 slide potentiometers. I haven't done any serious stress testing to see how fast you can change the potentiometers and still get reliable readings. My project is only in the initial phase. The multiplexer is the first submodule i build. I made a small PCB for it. I will post a complete step by step "how to" as soon as i get some time. But it is basically just two CD4051 IC's, and some kode based on the 4051 example in the Playground.

MikMo
http://www.mikmo.dk

warp

thanksMikMo.

I've already order 16 fades to start with (x2 multiplexers) but my main aim is to make it work with other input devicces (mainly sensors).

Anyone ever tried to use sensors with multiplexres??

thanks,
warp


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