Help with Sparkfun 31855K and MEGA

[yhs_515]

Hello!

I've been trying to configure 4 31855K boards, with no luck. Here is my current configuration. (I'm using a 3.3V voltage divider)

Nothing seemed to work with the serial monitor only showing 0.00.

I've tried to use just one sensor, but again, with no luck.

I was wondering, if I had connected any of these components incorrectly. (I've switched up the + and - for the thermocouples, but with no luck)

Any help would be greatly appreciated. Thanks!

[xfpd]

Show the code you are using.

[yhs_515]

Of course! Here it is for the single sensor.

#include "Adafruit_MAX31855.h"

#define SCK 52
#define SO 50
#define CS 33

Adafruit_MAX31855 thermocouple(CS, SO, SCK);

void setup() {
Serial.begin(9600);
delay(500);
Serial.println("MAX31855 Diagnostic Test");
}

void loop() {
double temp = thermocouple.readCelsius();
uint8_t fault = thermocouple.readError();

Serial.print("Temperature: ");
Serial.print(temp);
Serial.print(" °C, Fault code: ");
Serial.println(fault, BIN); //

delay(1000);
}

[xfpd]

Paste your code inside a code block...

[jim-p]

@yhs_515

I was wondering, if I had connected any of these components incorrectly

Yes you have.
Power the board with 3.3V from the Mega.
Use level shifter for SCK, SO and CS.

Also, soldering Chromel and Alumel wires, found in K-type thermocouples, is generally not a good idea due to the potential for altered temperature readings and the difficulty of achieving a good solder joint. It may look good but may be unsatisfactory considering the very small voltages involved.