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Temperature Sensor (LM35) 3 Steps

Temperature Sensor (LM35) :

The LM35 series area unit exactness integrated-circuit temperature devices with AN output voltage linearly proportional to the Centigrade temperature. LM35 could be a 3 terminal linear temperature detector from National Semiconductors. It will live temperature from -55 degree Celsius to +150 degree Celsius. The voltage output of the LM35 will increase 10mV per degree Celsius rise in temperature. LM35 will be operated from a 5V offer and therefore the stand by current is a smaller amount than 60uA.


How it is Work :

LM35 Temperature detector. This detector generates a high output voltage than thermocouples and will not like that the output voltage is amplified. The LM35 has AN output voltage that’s proportional to the Anders Celsius temperature. the dimensions issue is .01V/°C. The LM35 temperature detector provides AN output of 10mV per degree Celsius, with AN accuracy of zero.5°C at 25°C. It will be battery-powered by any DC voltage within the very four – 30v. The operational vary is –55°C to +150°c. The output of the luminous flux unit thirty-five is ten mV (0.01 volts) per degree Celsius.


The LM35 series area unit exactness integrated-circuit temperature devices with AN output voltage linearly proportional to the Centigrade temperature. … The low-output ohmic resistance, linear output, and precise inherent standardization of the LM35 device create interfacing to readout or management electronic equipment particularly simple. An example of a temperature detector is LM35. The LM35 series area unit exactness integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Anders Celsius temperature. The LM35 is working at -55° to +120°C.

Features :

Calibrated Directly in Celsius (Centigrade)

• Linear + 10-mV/°C Scale Factor

• 0.5°C Ensured Accuracy (at 25°C)

• Rated for Full -55°C to 150°C Range

• Suitable for Remote Applications

• Low-Cost Due to Wafer-Level Trimming

• Operates from 4 V to 30 V

• Less than 60-µA Current Drain

• Low Self-Heating, 0.08°C in Still Air

• Non-Linearity Only ±¼°C Typical

• Low-Impedance Output, 0.1 O for 1-mA Load


Requires Parts for Project :


Purchase link

  • Arduino Uno Board            [Purchase Links]             Ali-Express        Amazon
  • Project Board                                                               Ali-Express        Amazon
  • Connecting Cable                                                        Ali-Express        Amazon
  • LM35 (Temperature Sensor)                                        Ali-Express        Amazon
  • Variable Resistor (10k)                                                 Ali-Express        Amazon
  • Soldering Iron ( for hitting )                                          Ali-Express        Amazon


Connection Diagram :

The output of this device changes describes the one-dimensionality. The o/p voltage of this IC device is linearly comparative to the uranologist temperature. The operational voltage varies of this LM35 ranges from-55° to +150°C and it’s low-self heating. this can be operated beneath four to thirty volts. the foremost extensively used electronic devices are operational amplifiers, that are exact reasonably differential amplifiers. Temperature device circuit has terminals like 2 inputs like non-inverting (+) and inverting (-) and just one output pin.


This unstable voltage is provided to a comparator IC 741. OP electronic equipment is that the most usually used electronic devices these days. The IC 741 op-amp is one variety of differential electronic equipment. we’ve got used IC741 as a piece of non-inverting electronic equipment which implies pin-3 is that the input and therefore the output isn’t inverted. This LM35 temperature device circuit amplifies the distinction between its input terminals. the benefits of temperature device embrace it’s no result on the medium, additional correct, it’s Associate in Nursing simply conditioned output and It responds instantly.

Code Source 

You can watch the following video the written tutorial below