Skip to content

Temperature Sensor with Arduino and LM35 (Arduino + LM35)

Published by Matheus (X-warrior) Bratfisch on September 23, 2012

Hello,

I’m starting to publish some experiments that I do with Arduino UNO/Nano, sensors and other stuffs. Today I created a thermometer with LM35 sensor.

The LM35 sensor is a temperature sensor, it will variate 10mV/Celsius. It pins can be seen on image (pay attention, it is a bottom look)

LM35 Pins

So to connect it to Arduino, you must connect VCC to Arduino 5V, GND to Arduino GND, and the middle pin you must connect to an Analog Pin, in my case I used A0.

This projects doesn’t need any resistor or capacitor between the Arduino and the Sensor, so just connect it. The Arduino ADC has a precision of 10 bits, so in this case 5V / 2^10 = 5V / 1024, so 0.0049 is our factor. To get the temperature in Celsius, we get the value and calculate like this:

Temperature = (pin * 0.0049)*100

But why multiply by 100? PIN * 0.0049 will give the volts on port, if we multiply it by 1000 we will have millivolts on port, the sensor varies 10mV/C so we need to divide it by 10 to get the temperature. On mathematics multiply by 1000 and divide by 10 is the same as multiplying by 100. Understand? [Add on 12/12]

And to have it on Fahrenheit, we need to make a conversion

TemperatureF = (Temperature * 1.8) + 32.

The arduino code that I used is:

[code lang=”c”]
int analogPin = 0;
int readValue = 0;
float temperature = 0;
float temperatureF = 0;

void setup() {
Serial.begin(9600);
}

void loop() {
readValue = analogRead(analogPin);
//Serial.println(readValue);
temperature = (readValue * 0.0049);
temperature = temperature * 100;
temperatureF = (temperature * 1.8) + 32;
Serial.print(“Temperature: “);
Serial.print(temperature);
Serial.print(“C “);
Serial.print(temperatureF);
Serial.println(“F”);
delay(1000);
}
[/code]

Hope you like it,
Matheus

References:
LM35 Datasheet
Arduino analog Read

Published inArduino

1,398 Comments

  19. site site

    Milf hunters monique fuentesNanaimo assCan host families
    spank foreign exchange studentsFree non nude young girlsXxx hardcore fucking picutres positions coed fuckingBlack amateur bbwBig dick anal asianSexual massage la paz
    mexico xnxx Female bodybuilders big clitAmish vintage
    toasterBrittney spears nude pantyless photosBest
    porn picture databaseHardcore asian pon picsSex potter twinsScenes of a sexual nature klaxxonHand massage orgasm release
    https://xxxxvideos.cc Asian milf soapy massage
    tgpExtreme anal dvdBdsm puppy girlsPorn tube u-pornPorn housewives need cashFishnet stockings sexy modelsTeen boob blondeHilarious
    sex sceneMale on male butt sexTrazodone and breast feeding xnxx Sexy bare feet linksNude celebrirtyAmerican american asian experience found incarceration japanese lost reclaimingMicrodots kick ass netHow to get the best
    orgasmNaked women in belleville ilGay hercules cartoon gay sexBursting for peeSmall dicks datesDiva femdomThe womans sex
    trackElisha cuthebert naked

    # October 1, 2026

Leave a Reply

Your email address will not be published. Required fields are marked *