LM35 is a Temperature sensor, its output voltage changes, based on the surrounding temperature. It is a small and inexpensive IC that can be used to measure temperature between -55 °C to 150 °C. It can easily connect with any Microcontroller that has AC/DC function or with Arduino.
Lm35 IC by regulates voltage like +5V to the input pin and connected the ground pin to the ground of the circuit to measure the temperate in the form of voltage.
Pin Configuration:
Pin 1 receives a positive DC voltage typically 5 volts. The Pin 3 is the ground that receives the ground or negative current. The Pin 2 is the output of the IC that is used to get output from the temperature sensor.
How Does LM35 Sensor Work
The LM35 sensor is linear i.e. 10mv/°C which means that every degree rise in temperature by 10mv. In this way if the output of LM35 sensor is 220mv/0.22V the temperature will be 22 °C. If room temperature is 32 °C then the output of sensor will be 320mv i.e. 0.32V.
Alternative to LM35 Temperature Sensor
If you want to read the degree Fahrenheit then use LM34 Temperature sensor. It is same as LM35 but its electrical output is proportional to Degree Fahrenheit. LM34 has also same pins configuration and same voltage range same like lm35.
LM35 Temperature Sensor Applications:
- Mostly used to measure the temperature of a particular environment
- Auto shutdown the thermal temperature applications.
- Control the auto temperature of the fan or AC.
- It is also used with computer fan to control the heat of a system
- Temperatures for HVAC applications.
LM35 Regulator Features:
- Minimum volts -2 to 35 volts. Typically, 5V.
- It Can measure temperature between -55 °C to 150 °C
- The output voltage is directly proportional (Linear) to temperature (i.e.) there will be a rise of 10mV (0.01V) for every 1 °C rise in temperature.
- Accuracy is ±0.5 °C
- Drain current is less than 60uA
- Low-cost temperature sensor and easily available.
- Suitable for remote applications
- Available package: TO-92, TO-220, TO-CAN, and SOIC.