Temperature Monitoring with Arduino: A Comprehensive Guide

10.12.2024 - Engine: Gemini

Step-by-Step Guide for Temperature Monitoring with Arduino

Required Components:

• Arduino Uno or compatible board
• LM35 temperature sensor
• 10kΩ resistor
• Breadboard
• Jumper wires

Setup:

1. Connect the LM35 sensor to the 5V and ground pins of the Arduino.
2. Connect the output pin of the LM35 (pin 1) to analog input A0 of the Arduino through the 10kΩ resistor.
3. Optionally, connect the output pin of the LM35 to ground to calibrate it.

Programming:

// Include libraries
#include <Arduino.h>

// Define analog input for LM35 sensor
const int analogInput = A0;

void setup() {
  // Initialize serial port for output
  Serial.begin(9600);
}

void loop() {
  // Read analog voltage from sensor
  int analogValue = analogRead(analogInput);

  // Convert voltage to temperature (0.5V/°C)
  float temperature = analogValue * (5.0 / 1023.0);

  // Print temperature
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");

  // Delay to reduce CPU usage
  delay(500);
}

Code Explanation:

• The Arduino.h library is included.
• The analog input analogInput is set to A0.
• In the setup function, the serial port is initialized.
• In the loop function, the analog voltage from the sensor is read and converted to temperature.
• The temperature is printed to the serial port.
• A delay is used to reduce CPU usage.

Calibration (Optional):

1. Connect the output pin of the LM35 to ground.
2. Upload the sketch and open the serial console.
3. Note the displayed temperature.
4. Disconnect the output pin from ground.
5. In the sketch, change the following line:

float temperature = analogValue * (5.0 / 1023.0);

to:

float temperature = analogValue * (5.0 / 1023.0) - offset;

where offset is the temperature noted in step 3.

6. Upload the sketch again and the displayed temperature should now be more accurate.