Multiple Thermocouples on nano

Official Hardware Nano Family Classic Nano
1

Hi, I am new to Arduino and the forum. I have been fiddling for about a month now and one of my first projects is connecting a K type thermocouple to a Nano board to measure some temperatures on a piston engine. I have managed to copy/paste/modify code enabling me to read one thermocouple. I would be appreciate for a novice like myself if someone could advise how to connect multiple thermocouple (4 in my case) to a nano board with the additional code required. This is what I have successfully used so far
Average Thermocouple
Average Thermocouple

Reads a temperature from a thermocouple based
on the MAX6675 driver and displays it in the default Serial.

GitHub - YuriiSalimov/MAX6675_Thermocouple: [For Arduino] Library for working with a thermocouple based on the MAX6675 driver.

Created by Yurii Salimov, May, 2019.
Released into the public domain.
*/
#include <Thermocouple.h>
#include <MAX6675_Thermocouple.h>

#define SCK_PIN 6
#define CS_PIN 5
#define SO_PIN 4

Thermocouple* thermocouple;

// the setup function runs once when you press reset or power the board
void setup() {
Serial.begin(9600);

thermocouple = new MAX6675_Thermocouple(SCK_PIN, CS_PIN, SO_PIN);
}

// the loop function runs over and over again forever
void loop() {
// Reads temperature
const double celsius = thermocouple->readCelsius();
const double kelvin = thermocouple->readKelvin();
const double fahrenheit = thermocouple->readFahrenheit();

// Output of information
Serial.print("Temperature: ");
Serial.print(celsius);
Serial.print(" C, ");
Serial.print(fahrenheit);
Serial.println(" F");

delay(500); // optionally, only to delay the output of information in the example.

2

Hello. Please read the forum rules, format your code, copy it for the forum and paste it here.

3

Based on the library source code, you need an individual pin for the CS (chip select) of each thermocouple; e.g.

#define SCK_PIN 6
#define SO_PIN 4

#define CS_PIN1 5
#define CS_PIN2 7

And you can create a couple of pointers to objects

Thermocouple* thermocouple1;
Thermocouple* thermocouple2;

In setup(), you can initialise them

thermocouple1 = new MAX6675_Thermocouple(SCK_PIN, CS_PIN1, SO_PIN);
thermocouple2 = new MAX6675_Thermocouple(SCK_PIN, CS_PIN2, SO_PIN);

And in loop() you can read each of them

double celsius = thermocouple1->readCelsius();
Serial.print("Temperature 1: ");
Serial.print(celsius);
Serial.print(" C, ");

celsius = thermocouple2->readCelsius();
Serial.print("Temperature 2: ");
Serial.print(celsius);
Serial.print(" C, ");

Not compiled, not tested. Give it a try, if it works as expected it can be optimised; each time you start numbering variables (like I did), you should start thinking about arrays.

// Edit
Changed the second double celsius = thermocouple2->readCelsius(); to celsius = thermocouple2->readCelsius();. Copy/paste error, sorry.

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