![]() ![]() Serial. Because I had limited time and resources, I purchased a microcontroller-compatible MAX6675 thermocouple module and a K-type thermocouple from eBay. Adafruit_MAX31856 maxthermo = Adafruit_MAX31856(10) Recently, a couple of students needed a thermocouple circuit and asked me to build them one. use hardware SPI, just pass in the CS pin A really super simple device, perfect for reading a K-Type thermocouple with your Arduino, I mean it, this is crazy easy to use, so simple its not even. For some reason, the code right now only outputs zero, as shown below:Īdafruit_MAX31856 maxthermo = Adafruit_MAX31856(13, 14, 15, 16) Step 1: Circuit Step 2: Library Installation Step 3: Code Overview Are you looking for a reliable temperature sensor The MAX6675 Thermocouple Module is just what you need. ![]() I have verified that the amplifier and board have been correctly soldered, and I have tried re-screwing in the thermocouple multiple times, tested every connection with a multimeter for faults, and tried a new BLE board, and tried a new thermocouple. The current code I am using is pasted below. With a full scale range of 5 volts an Arduino ADC has a resolution of approximately 5 mV. An Arduino ADC is a 10 bit ADC, This a resolution of 1 part in 1024. Raw voltage at input of MAX6675 -0.93mV or (-24C using K-Type conversion table for -0.93mV) Correction factor because the MAX6675 measures it's internal temp of 15C -0.597mV. The output of a Type J thermocouple is approximately 5mV per 100 degrees Centigrade and the output of a Type K thermocouple is approximately 4mv per 100 degrees Centigrade. I am currently working on a project where I am trying to connect a K-Type thermocouple with an Arduino Nano 33 BLE. assume the MAX6675 is at 15C and the Probe Junction is at -40C, the Raw voltage at the MAX6675 input is:'cold Junction' 15C 0.597mVProbe (welded Joint) -40C -1.527mV.
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