MAX31855 Thermocouple Amplifier and Multiplexer

by Meissnerb44 on Tue Jan 08, 2013 5:35 pm

I am trying to hook up the Max31855 breakout board to a Sparkfun multiplexer breakout board which holds the 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. I want to hook up 5 thermocouples to the multiplexer so that they can all be read without having to use 5 separate thermocouple amplifiers. I am having a hard time figuring out how this would work because I believe that the Max31855 breakout would need to receive the signal from both thermocouple wires at the same time. I could very well be mistaken but I am confused on how or if it could work. Any suggestions??

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Re: MAX31855 Thermocouple Amplifier and Multiplexer

by adafruit_support_rick on Tue Jan 08, 2013 6:14 pm

Well, you could use two multiplexers - one for each side of the thermocouples.

Or you could use 5 MAX31855 breakouts. You would need 1 CLK output, 1 data input, and 5 chip select outputs on your microcontroller.
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