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Component Documentation

How to Use Temperature Sensor (LM35): Examples, Pinouts, and Specs

Image of Temperature Sensor (LM35)

Design with Temperature Sensor (LM35) in Cirkit Designer

Introduction

The LM35 is a precision integrated-circuit temperature sensor, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. It is renowned for its ease of use, low cost, and minimal need for external calibration or trimming. The LM35 is commonly used in a wide range of applications, including environmental temperature monitoring, system thermal management, and personal projects, especially those involving microcontrollers like the Arduino UNO.

Explore Projects Built with Temperature Sensor (LM35)

Arduino UNO Based Temperature Monitoring with LM35 Sensor

Image of sattelite: A project utilizing Temperature Sensor (LM35) in a practical application

This circuit is designed to measure temperature using an LM35 temperature sensor and display the readings in degrees Celsius. The sensor's output voltage is read by an Arduino UNO's analog input, which then converts the voltage to a temperature value. The Arduino is programmed to serially output the temperature data, which can be monitored in real-time.

Open Project in Cirkit Designer

Arduino UNO Based LM35 Temperature Sensor Monitoring System

Image of Measuring Temperature With LM35 and Arduino UNO: A project utilizing Temperature Sensor (LM35) in a practical application

This circuit is designed to measure temperature using an LM35 temperature sensor interfaced with an Arduino UNO microcontroller. The sensor's output voltage, which is proportional to the temperature, is read by the Arduino's analog input A0. The embedded code on the Arduino processes this signal to calculate and output the temperature in both Celsius and Fahrenheit to the serial monitor.

Open Project in Cirkit Designer

Arduino UNO Based Temperature Monitoring System

Image of temps: A project utilizing Temperature Sensor (LM35) in a practical application

This circuit is designed to measure temperature using an LM35 temperature sensor interfaced with an Arduino UNO microcontroller. The sensor's output voltage, which is proportional to the temperature, is fed into the Arduino's analog input A1 for processing. The Arduino is powered by 5V and shares a common ground with the sensor, setting up the basic framework for temperature data acquisition.

Open Project in Cirkit Designer

Arduino UNO and LM35 Temperature Sensor with Serial Monitoring

Image of : A project utilizing Temperature Sensor (LM35) in a practical application

This circuit uses an Arduino UNO to read temperature data from an LM35 temperature sensor. The sensor's output is connected to the Arduino's analog input pin A0, and the Arduino processes this data to calculate and display the temperature in Celsius on the Serial Monitor.

Open Project in Cirkit Designer

Explore Projects Built with Temperature Sensor (LM35)

Image of sattelite: A project utilizing Temperature Sensor (LM35) in a practical application

Arduino UNO Based Temperature Monitoring with LM35 Sensor

This circuit is designed to measure temperature using an LM35 temperature sensor and display the readings in degrees Celsius. The sensor's output voltage is read by an Arduino UNO's analog input, which then converts the voltage to a temperature value. The Arduino is programmed to serially output the temperature data, which can be monitored in real-time.

Open Project in Cirkit Designer

Image of Measuring Temperature With LM35 and Arduino UNO: A project utilizing Temperature Sensor (LM35) in a practical application

Arduino UNO Based LM35 Temperature Sensor Monitoring System

This circuit is designed to measure temperature using an LM35 temperature sensor interfaced with an Arduino UNO microcontroller. The sensor's output voltage, which is proportional to the temperature, is read by the Arduino's analog input A0. The embedded code on the Arduino processes this signal to calculate and output the temperature in both Celsius and Fahrenheit to the serial monitor.

Open Project in Cirkit Designer

Image of temps: A project utilizing Temperature Sensor (LM35) in a practical application

Arduino UNO Based Temperature Monitoring System

This circuit is designed to measure temperature using an LM35 temperature sensor interfaced with an Arduino UNO microcontroller. The sensor's output voltage, which is proportional to the temperature, is fed into the Arduino's analog input A1 for processing. The Arduino is powered by 5V and shares a common ground with the sensor, setting up the basic framework for temperature data acquisition.

Open Project in Cirkit Designer

Image of : A project utilizing Temperature Sensor (LM35) in a practical application

Arduino UNO and LM35 Temperature Sensor with Serial Monitoring

This circuit uses an Arduino UNO to read temperature data from an LM35 temperature sensor. The sensor's output is connected to the Arduino's analog input pin A0, and the Arduino processes this data to calculate and display the temperature in Celsius on the Serial Monitor.

Open Project in Cirkit Designer

Technical Specifications

Key Technical Details

Temperature Range: -55°C to +150°C
Output Voltage Range: 10 mV/°C scale factor (0.01 V/°C)
Accuracy: ±0.5°C at +25°C
Operating Voltage: 4 V to 30 V
Current Consumption: ~60 μA

Pin Configuration and Descriptions

Pin Number	Name	Description
1	VCC	Power supply input (4 V to 30 V)
2	OUT	Analog output voltage
3	GND	Ground

Usage Instructions

Connecting the LM35 to a Circuit

Connect the VCC pin to a positive power supply (4 V to 30 V).
Connect the GND pin to the ground of the power supply.
The OUT pin provides an analog output voltage that can be connected to an analog-to-digital converter (ADC) input on a microcontroller.

Important Considerations and Best Practices

Avoid exposing the sensor to conditions beyond its operating range.
Ensure that the power supply voltage is stable and within the specified range.
Use decoupling capacitors close to the sensor's power supply pins to filter out noise.
Keep the sensor away from heat-generating components to prevent false readings.
Use shielded cables for the output if the sensor is placed in a noisy environment.

Example Code for Arduino UNO

// Define the LM35 sensor analog pin
const int lm35Pin = A0;

void setup() {
  // Start the serial communication
  Serial.begin(9600);
}

void loop() {
  // Read the sensor voltage
  int sensorValue = analogRead(lm35Pin);
  // Convert the sensor reading to temperature in Celsius
  float temperatureC = sensorValue * (5.0 / 1023.0) * 100.0;
  
  // Print the temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" C");
  
  // Wait for a second before reading again
  delay(1000);
}

Troubleshooting and FAQs

Common Issues

Inaccurate Temperature Readings: Ensure that the sensor is not placed near heat sources and that the power supply is stable.
No Output Voltage: Check the connections and ensure that the sensor is powered correctly.
Fluctuating Readings: Use decoupling capacitors and shielded cables to minimize noise.

FAQs

Q: Can the LM35 be used to measure negative temperatures? A: Yes, but you will need to provide a negative supply voltage to the GND pin for temperatures below 0°C.

Q: How can I improve the accuracy of the sensor? A: Use a stable power supply, place the sensor away from heat sources, and calibrate the sensor if necessary.

Q: Is it necessary to calibrate the LM35 sensor? A: The LM35 is factory-calibrated but can be fine-tuned for critical applications.

Q: Can I connect multiple LM35 sensors to a single microcontroller? A: Yes, you can connect multiple sensors to different analog pins on a microcontroller and read them separately.

For further assistance, consult the LM35 datasheet or contact technical support.