LM35 Temperature Sensor

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The LM35 temperature sensor

The LM35 temperature sensor is an analog temperature sensor .This integrated circuit has 3 pins and generates an output voltage in linear relation with the temperature expressed in degrees Celsius

The LM35 sensor is able to measure temperatures ranging from (-55 ° C to + 150 ° C) in its most precise version and with the right mounting, enough to measure any temperature.

The analog output of the sensor is proportional to the temperature. It suffices to measure the voltage at the output of the sensor to deduce the temperature. Each degree Celsius corresponds to a voltage of + 10mV.

LM35 Temperature Sensor pinout

The LM35 does not require any external calibration or size and maintains an accuracy of (+ / -0.4 ° C) at room temperature and (+ / - 0.8 ° C) over a range of 0-100° C.

The temperature measured by the sensor is given by the relation:

T = Vout / 10

with:

T: Temperature [° C]

Vout: Output voltage [mV]

 

DHT22 sensor

DHT22 sensor


The DHT22  temperature and humidity sensor communicates with a microcontroller through a serial port. The sensor is calibrated and does not require additional components to be able to be used.

DHT22 and DHT11 are both 3.3 volts and 5 volts compatible (5 volts recommended for accurate measurements). They also have the same wiring and the same communication protocol.

 








Note 

The DHT11 cannot measure minus temperatures or temperatures above 50 ° C. So be careful when using outdoors.



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