I am making a temperature logger using the Arduino UNO. I have 5 MAX31855 thermocouple amplifiers installed with K-type thermocouples.
I can get four working properly by powering directly from the 3.3V pin. However, when I add a fifth, I start getting bad results across multiple thermocouples. Moving them to the 5V pin did not change the outcome. Is this possibly an issue with current drop across the thermocouples?
Would you anticipate any issues with the 'clock' and 'chip select' pins being wired in series for all five thermocouples? I did this to only use 7 of the Arduino digital pins instead of 15.
bin971:
Would you anticipate any issues with the 'clock' and 'chip select' pins being wired in series for all five thermocouples? I did this to only use 7 of the Arduino digital pins instead of 15.
All of the chips should share the clock and slave out (or digital out, whatever) pin but each chip needs its own chip select pin.
bin971:
Would you anticipate any issues with the 'clock' and 'chip select' pins being wired in series for all five thermocouples? I did this to only use 7 of the Arduino digital pins instead of 15.
All of the chips should share the clock and slave out (or digital out, whatever) pin but each chip needs its own chip select pin.
Wow, I'm dumb, many thanks! I'll make the switch tomorrow. Already confirmed they all work individually.