LM35

 LM35 IC Temperature Sensor

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 LM35 IC Temperature Sensor – Temperature is a quantitative measure of heat and cold measured by a thermometer. One sensor that can measure temperature is LM35.

LM35

The features of IC LM 35 are:

  • Calibration in units of degrees Celsius.
  • Linear +10 mV / o C.
  • Accuracy of 0.5 ˚C at room temperature.
  • Range +2 o C – 150 ˚C.
  • Operated on 4 V – 30 V. power supply
  • Flow that flows less than 60 μ A

 

 LM35 Temperature Sensor Datasheet

 

 

How the LM35 Sensor works

In practice the LM35 sensor interface process can be said to be very easy. In the LM35 sensor IC there are three pin pins, Vs, Vout and ground pin. In operation, pin Vs is connected to the source voltage of between 4-20 volts while the Ground pin is connected to the ground and the Vout pin is the output that will drain the voltage whose amount will be in accordance with the temperature received from around.

The working principle of this temperature sensor, is that the temperature sensor is used to convert the temperature to voltage, in other words the heat captured by the LM35 as a temperature sensor will be converted into voltage. While the process of changing heat into a voltage is because in LM35 there is a type of PTC (Positive Temperature Coefisient) thermistor, which is the thermistor that captures the change in heat. The working principle of PTC is that the resistance value will increase with increasing temperature. The greater the resistance will cause stress
the output produced is getting bigger.

 

Advantages and disadvantages of Sensors LM35

Advantages:

  1. Far temperature range, between -55 to + 150 ˚C
  2. Low self-heating, at 0.08 ˚C
  3. Operates at voltages 4 to 30 V
  4. The circuit is not complicated
  5. Does not require signal conditioning

Disadvantages

  1. Requires a voltage source to operate.

 

Do testing:

This sensor can detect temperatures from 0-100 degrees Celsius with the characteristics of 10mV at the output representing 1 degree Celsius. If the voltage of 300mV means that the temperature is 30 degrees Celsius, if the voltage of 230mV means the temperature is 23 degrees Celsius. In this experiment, I prepared a digital Multitester, a 5 Vdc voltage source, and an LM35 temperature sensor. The use of digital AVO is here to make it easier to read the voltage output on the sensor. For the experiment, the tip of the left foot (+ 5vdc) is connected with a clamp plus a red cable on the power supply, the middle leg is connected with a pin plus a red cable on the AVO meter (this is the output votase on the sensor), then the right foot is connected with ground, namely black pins and clasps on the AVO and power supply. The result is as follows:

LM35 Work Principle

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