LM35, LM335 and LM34 Temperature Sensors with Arduino

 

The LM35, LM335, and LM34 are analog temperature sensors that can be interfaced with an Arduino to measure temperature. Here's a basic guide on how to connect and use each of these sensors:

Applications:

- Home automation

- Weather monitoring

- Industrial temperature control

- Various DIY electronic projects requiring temperature sensing

 LM35 Temperature Sensor:

Components Needed:

1. Arduino board (e.g., Arduino Uno)

2. LM35 temperature sensor

3. Breadboard and jumper wires

Wiring:

- Connect the LM35 as follows:

  - Connect the LM35 VCC pin to 5V on Arduino.

  - Connect the LM35 GND pin to GND on Arduino.

  - Connect the LM35 OUT pin to an analog pin on Arduino (e.g., A0).

 Arduino Code lm35 :

const int lm35Pin = A0;

void setup() {

  Serial.begin(9600);

}

void loop() {

  // Read the analog value from LM35

  int sensorValue = analogRead(lm35Pin);

  // Convert the analog value to temperature in Celsius

  float temperatureC = (sensorValue * 5.0 / 1024.0) * 100.0;

  // Print the temperature to the serial monitor

  Serial.print("LM35 Temperature: ");

  Serial.print(temperatureC);

  Serial.println(" °C");

  delay(1000); // Wait for 1 second before the next reading

}

LM335 Temperature Sensor:

 Components Needed:

1. Arduino board (e.g., Arduino Uno)

2. LM335 temperature sensor

3. Breadboard and jumper wires

Wiring:

- Connect the LM335 as follows:

  - Connect the LM335 VCC pin to 5V on Arduino.

  - Connect the LM335 GND pin to GND on Arduino.

  - Connect the LM335 OUT pin to an analog pin on Arduino (e.g., A0).

 Arduino Code lm335 :

const int lm335Pin = A0;

void setup() {

  Serial.begin(9600);

}

void loop() {

  // Read the analog value from LM335

  int sensorValue = analogRead(lm335Pin);

  // Convert the analog value to temperature in Celsius

  float temperatureC = (sensorValue * 5.0 / 1024.0 - 0.5) * 100.0;

  // Print the temperature to the serial monitor

  Serial.print("LM335 Temperature: ");

  Serial.print(temperatureC);

  Serial.println(" °C");

  delay(1000); // Wait for 1 second before the next reading

}

 LM34 Temperature Sensor:

The LM34 is similar to the LM35, but it provides temperature readings in Fahrenheit.

 Components Needed:

1. Arduino board (e.g., Arduino Uno)

2. LM34 temperature sensor

3. Breadboard and jumper wires

 Wiring:

- Connect the LM34 as follows:

  - Connect the LM34 VCC pin to 5V on Arduino.

  - Connect the LM34 GND pin to GND on Arduino.

  - Connect the LM34 OUT pin to an analog pin on Arduino (e.g., A0).

 Arduino Code lm34 :

const int lm34Pin = A0;

void setup() {

  Serial.begin(9600);

}

void loop() {

  // Read the analog value from LM34

  int sensorValue = analogRead(lm34Pin);

  // Convert the analog value to temperature in Fahrenheit

  float temperatureF = (sensorValue * 5.0 / 1024.0) * 100.0;

  // Print the temperature to the serial monitor

  Serial.print("LM34 Temperature: ");

  Serial.print(temperatureF);

  Serial.println(" °F");

  delay(1000); // Wait for 1 second before the next reading

}

Adjust the analog pin (e.g., A0) in the code to match your actual wiring configuration. These examples provide a basic setup for reading temperature from these sensors using Arduino. Depending on your project, you may need to calibrate the sensors or incorporate additional features into your code.

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