Circuit Documentation

Summary

This circuit is designed to measure temperature using a Type K thermocouple and display the readings on a 16x2 I2C LCD. The temperature data is processed by a MAX6675 module and an Arduino UNO microcontroller. The circuit is powered by a 5V battery.

Component List

16x2 I2C LCD

• Description: A 16x2 character LCD display with I2C interface.
• Pins: GND, VCC, SDA, SCL

5V Battery

• Description: A 5V power source.
• Pins: positive, negative

MAX6675 Module

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

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

Thermocouple Type K

• Description: A Type K thermocouple for temperature measurement.
• Pins: -, +

Wiring Details

16x2 I2C LCD

• GND: Connected to Arduino UNO GND and 5V battery negative
• VCC: Connected to Arduino UNO 5V and 5V battery positive
• SDA: Connected to Arduino UNO A4
• SCL: Connected to Arduino UNO A5

5V Battery

• positive: Connected to Arduino UNO 5V and 16x2 I2C LCD VCC
• negative: Connected to Arduino UNO GND and 16x2 I2C LCD GND

MAX6675 Module

• GND: Connected to Arduino UNO GND
• VCC: Connected to Arduino UNO 5V and 5V battery positive
• SCK: Connected to Arduino UNO D13
• CS: Connected to Arduino UNO D10
• SO: Connected to Arduino UNO D12
• -: Connected to Thermocouple Type K -
• +: Connected to Thermocouple Type K +

Arduino UNO

• GND: Connected to MAX6675 Module GND, 5V battery negative, and 16x2 I2C LCD GND
• 5V: Connected to MAX6675 Module VCC, 5V battery positive, and 16x2 I2C LCD VCC
• D13: Connected to MAX6675 Module SCK
• D10: Connected to MAX6675 Module CS
• D12: Connected to MAX6675 Module SO
• A4: Connected to 16x2 I2C LCD SDA
• A5: Connected to 16x2 I2C LCD SCL

Thermocouple Type K

• -: Connected to MAX6675 Module -
• +: Connected to MAX6675 Module +

Documented Code

Arduino Sketch (sketch.ino)

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "max6675.h"

int thermoSO = 12; // Serial Out
int thermoCS = 10; // Chip Select
int thermoSCK = 13; // Serial Clock

MAX6675 thermocouple(thermoSCK, thermoCS, thermoSO);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  lcd.begin();
  lcd.backlight();
  lcd.print("Thermocouple");
  delay(2000);
  lcd.clear();
}

void loop() {
  double tempC = thermocouple.readCelsius();
  double tempF = thermocouple.readFahrenheit();

  lcd.setCursor(0, 0);
  lcd.print("Temp C: ");
  lcd.print(tempC, 1);

  lcd.setCursor(0, 1);
  lcd.print("Temp F: ");
  lcd.print(tempF, 1);

  delay(1000);
}

Documentation (documentation.txt)

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "max6675.h"

// Define MAX6675 pins
int thermoSO = 12; // Serial Out
int thermoCS = 10; // Chip Select
int thermoSCK = 13; // Serial Clock

// Initialize MAX6675
MAX6675 thermocouple(thermoSCK, thermoCS, thermoSO);

// Initialize I2C LCD (Address 0x27, 16 chars, 2 lines)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600); // Serial monitor for debugging
  lcd.begin();
  lcd.backlight();
  lcd.print("Thermocouple");
  delay(2000);
  lcd.clear();
}

void loop() {
  double tempC = thermocouple.readCelsius();
  double tempF = thermocouple.readFahrenheit();

  lcd.setCursor(0, 0);
  lcd.print("Temp C: ");
  lcd.print(tempC, 1);

  lcd.setCursor(0, 1);
  lcd.print("Temp F: ");
  lcd.print(tempF, 1);

  delay(1000);
}