Hi,
I followed this guide on Adafruit (Arduino Code | MAX31855 Thermocouple | Adafruit Learning System) to wire my thermocouple amp and thermocouple to an Arduino Uno Wifi Rev 2. I have attached a picture of the wiring. I am using Exergen's Micro UIRT/C Series of Self Powered K Type Infrared Thermocouple, which comes with a Red wire, Yellow wire and what looks like a wire drain (I did not connect this to anything - see picture attached).
I am getting the following readings from the Serial Monitor:
17:40:37.336 -> Internal Temp = 22.81
17:40:37.336 -> Something wrong with thermocouple!
17:40:38.336 -> Internal Temp = 22.87
17:40:38.336 -> Something wrong with thermocouple!
17:40:39.320 -> Internal Temp = 22.87
17:40:39.355 -> Something wrong with thermocouple!
17:40:40.344 -> Internal Temp = 22.81
17:40:40.344 -> Something wrong with thermocouple!
17:40:41.328 -> Internal Temp = 22.81
17:40:41.365 -> Something wrong with thermocouple!
17:40:42.363 -> Internal Temp = 22.87
17:40:42.363 -> Something wrong with thermocouple!
17:40:43.349 -> Internal Temp = 22.87
17:40:43.382 -> Something wrong with thermocouple!
(I'm not sure what the internal temperature means exactly)
Here is my code:
/***************************************************
This is an example for the Adafruit Thermocouple Sensor w/MAX31855K
Designed specifically to work with the Adafruit Thermocouple Sensor
----> https://www.adafruit.com/products/269
These displays use SPI to communicate, 3 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/
#include <SPI.h>
#include "Adafruit_MAX31855.h"
// Default connection is using software SPI, but comment and uncomment one of
// the two examples below to switch between software SPI and hardware SPI:
// Example creating a thermocouple instance with software SPI on any three
// digital IO pins.
#define MAXDO 3
#define MAXCS 4
#define MAXCLK 5
// initialize the Thermocouple
Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);
// Example creating a thermocouple instance with hardware SPI
// on a given CS pin.
//#define MAXCS 10
//Adafruit_MAX31855 thermocouple(MAXCS);
void setup() {
Serial.begin(9600);
while (!Serial) delay(1); // wait for Serial on Leonardo/Zero, etc
Serial.println("MAX31855 test");
// wait for MAX chip to stabilize
delay(500);
}
void loop() {
// basic readout test, just print the current temp
Serial.print("Internal Temp = ");
Serial.println(thermocouple.readInternal());
double c = thermocouple.readCelsius();
if (isnan(c)) {
Serial.println("Something wrong with thermocouple!");
} else {
Serial.print("C = ");
Serial.println(c);
}
//Serial.print("F = ");
//Serial.println(thermocouple.readFahrenheit());
delay(1000);
}
These are my connections (I followed the Adafruit tutorial linked above):
VIN on thermocouple to 5V on the UNo
GND on thermocouple to GND on the UNo
DO on thermocouple to Pin 3 on the UNo
CS on thermocouple to Pin 4 on the UNo
CLK on thermocouple to Pin 5 on the UNo
It seems that the readings it is getting is "not a number" as "nan" suggests, but I don't know what to do resolve this. Any help is appreciated!!
