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)
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
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