Temperature sensor
Schematic
Please note, that generally you do not connect the 3.3V VCC to the Aref pin, but doing so makes the reading better. I also want to take your attention to the fact that I use 3.3V instead of the 5V as VCC, as the 3.3V regulator has a better filtering. For more information about this, please continue reading here.
Photo
Sample code
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// the reference voltage double REF_VOLTAGE = 3.3; // the pin where the temperature is to be mesured int tempPin = 5; void setup() { // open te serial output with 115200 baud Serial.begin(115200); // tell the Arduino that the reference voltage is // provided by an external source analogReference(EXTERNAL); // wait for the external source to be switched delay(100); } void loop() { // read the tempetarue int tempReading = analogRead(tempPin); // converting that reading to voltage float voltage = tempReading * REF_VOLTAGE / 1024.0; // convert the voltage to a temperature float celsius = (voltage - 0.5) * 100 ; // print it on the serial output Serial.println(celsius); // wait a second delay(1000); }
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