So if you are using internet and you are matching your temperature reading from the one that is given for your city on a weather forecast site than your reading will not be same like theirs. It can only measure the temperature of the surroundings with in the circle of between 100 to 500 feet. ![]() Note: LM35 is an absolute temperature sensor. It gives a voltage signal that is actually the temperature of the particular place. To Pin#1 of Lm35 apply 5v, make Pin#2 ground, and the third one the middle pin is output pin. The circuit diagram of the project is given below. Arduino analog pin is used to read the analog output signals from the sensor. Lm35 can measure from -50 degree centigrade/Celsius up to 150 degree centigrade/Celsius. 10 mills volt represent one degree centigrade/Celsius. So if Lm35 outputs 100 mills volts the equivalent temperature in centigrade/Celsius will be 100/10 = 10 centigrade/Celsius. Lm35 Celsius/centigrade resolution is 10 mills volt. Lm35 output voltage is proportional to centigrade/Celsius temperature. The temperature which is taken as T in degrees Celsius (C) is equal to the temperature T which is in degrees we see to convert Fahrenheit to celsius (F) minus 32 times 5/9: That is we take T(C) (T(F) - 32) × 5/9 or We can write it as T(C) (T(F) - 32) / (9/5) or We write it as T(C) (T(F) - 32) / 1. Lm35 Pin out, working, temperature measuring formula and internal structure.It will help you in understanding the code below. I suggest you to take that tutorial if you are new and don’t know much about the lm35 temperature sensor. I also derived temperature measuring formula for lm35 temperature sensor. I prepared a nice tutorial on Lm35 pin out its internal structure and working. ![]() Some other old analog temperature sensors like TMP36 is also available in market but they are not popular among students, hobbyist and diy electronics project makers. Lm35 is the oldest analog output temperature sensor still serving and available in the market. For this tutorial we need an arduino board(Uno, Maga, Lenardo etc) and Lm35 temperature sensor. I am going to measure the temperature using low cost and efficient lm35 analog output temperature sensor with arduino. Measuring Temperature of a place through Arduino is very easy by using any of the commercial temperature sensor available in the market.
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