Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with six MAX6675 thermocouple modules and six k-type thermocouples. The Arduino reads temperature data from each thermocouple via the MAX6675 modules and outputs the data through serial communication.

Component List

1. Arduino UNO

   • Description: A microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. k-type Thermocouple

   • Description: A type of thermocouple used for temperature measurement.
   • Pins: 1, 2

3. MAX6675 Module

   • Description: A thermocouple-to-digital converter module.
   • Pins: GND, VCC, SCK, CS, SO, -, +

Wiring Details

Arduino UNO

• 5V: Connected to VCC of all MAX6675 Modules.
• GND: Connected to GND of all MAX6675 Modules.
• D13: Connected to SCK of all MAX6675 Modules.
• D12: Connected to SO of all MAX6675 Modules.
• D7: Connected to CS of MAX6675 Module 1.
• D6: Connected to CS of MAX6675 Module 2.
• D5: Connected to CS of MAX6675 Module 3.
• D4: Connected to CS of MAX6675 Module 4.
• D3: Connected to CS of MAX6675 Module 5.
• D2: Connected to CS of MAX6675 Module 6.

k-type Thermocouple 1

• Pin 1: Connected to - of MAX6675 Module 1.
• Pin 2: Connected to + of MAX6675 Module 1.

k-type Thermocouple 2

• Pin 1: Connected to - of MAX6675 Module 2.
• Pin 2: Connected to + of MAX6675 Module 2.

k-type Thermocouple 3

• Pin 1: Connected to - of MAX6675 Module 3.
• Pin 2: Connected to + of MAX6675 Module 3.

k-type Thermocouple 4

• Pin 1: Connected to - of MAX6675 Module 4.
• Pin 2: Connected to + of MAX6675 Module 4.

k-type Thermocouple 5

• Pin 1: Connected to - of MAX6675 Module 5.
• Pin 2: Connected to + of MAX6675 Module 5.

k-type Thermocouple 6

• Pin 1: Connected to - of MAX6675 Module 6.
• Pin 2: Connected to + of MAX6675 Module 6.

MAX6675 Module 1

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SCK: Connected to D13 of Arduino UNO.
• CS: Connected to D2 of Arduino UNO.
• SO: Connected to D12 of Arduino UNO.
• -: Connected to Pin 1 of k-type Thermocouple 1.
• +: Connected to Pin 2 of k-type Thermocouple 1.

MAX6675 Module 2

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SCK: Connected to D13 of Arduino UNO.
• CS: Connected to D3 of Arduino UNO.
• SO: Connected to D12 of Arduino UNO.
• -: Connected to Pin 1 of k-type Thermocouple 2.
• +: Connected to Pin 2 of k-type Thermocouple 2.

MAX6675 Module 3

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SCK: Connected to D13 of Arduino UNO.
• CS: Connected to D4 of Arduino UNO.
• SO: Connected to D12 of Arduino UNO.
• -: Connected to Pin 1 of k-type Thermocouple 3.
• +: Connected to Pin 2 of k-type Thermocouple 3.

MAX6675 Module 4

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SCK: Connected to D13 of Arduino UNO.
• CS: Connected to D5 of Arduino UNO.
• SO: Connected to D12 of Arduino UNO.
• -: Connected to Pin 1 of k-type Thermocouple 4.
• +: Connected to Pin 2 of k-type Thermocouple 4.

MAX6675 Module 5

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SCK: Connected to D13 of Arduino UNO.
• CS: Connected to D6 of Arduino UNO.
• SO: Connected to D12 of Arduino UNO.
• -: Connected to Pin 1 of k-type Thermocouple 5.
• +: Connected to Pin 2 of k-type Thermocouple 5.

MAX6675 Module 6

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SCK: Connected to D13 of Arduino UNO.
• CS: Connected to D7 of Arduino UNO.
• SO: Connected to D12 of Arduino UNO.
• -: Connected to Pin 1 of k-type Thermocouple 6.
• +: Connected to Pin 2 of k-type Thermocouple 6.

Code Documentation

#include <MAX6675.h>

// Define pins for each MAX6675 module
int cs_pins[] = {2, 3, 4, 5, 6, 7}; // Chip Select pins
int so_pin = 12; // Serial Output pin (shared)
int sck_pin = 13; // Serial Clock pin (shared)

// Create MAX6675 objects for each module
MAX6675 thermocouples[] = {
  MAX6675(sck_pin, cs_pins[0], so_pin),
  MAX6675(sck_pin, cs_pins[1], so_pin),
  MAX6675(sck_pin, cs_pins[2], so_pin),
  MAX6675(sck_pin, cs_pins[3], so_pin),
  MAX6675(sck_pin, cs_pins[4], so_pin),
  MAX6675(sck_pin, cs_pins[5], so_pin)
};

void setup() {
  Serial.begin(9600); // Initialize serial communication
  Serial.println("MAX6675 Multi-Thermocouple Test");
}

void loop() {
  for (int i = 0; i < 6; i++) {
    // Read the temperature for each thermocouple
    double temp = thermocouples[i].readCelsius();

    // Print the temperature
    Serial.print(temp, 2); // Print with 2 decimal places

    // Add a comma for all but the last value
    if (i < 5) {
      Serial.print(",");
    }
  }
  Serial.println(); // End the line after all values
  delay(10000); // Update every second
}

This code initializes the MAX6675 modules and reads the temperature from each thermocouple every second, printing the values to the serial monitor.