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?