Hi there,
I am trying to measure ambient temperature with a LM35 sensor. As shown on the datasheet and on many tutorials around the internet, I connect the Vcc pin to 5 volts, the Gnd pin to ground and the Out pin to A0.
I previously uploaded the basic analog input program to make the D13 led blink.
This assembly burned out my arduino nano in seconds.
Then, I have tried with caution with my arduino uno, and the power led goes off the moment I connect Vcc and Gnd. I disconnect it immediately to not burn out my second and last available arduino board. I have tried with the 3.3v instead of the 5v. It does not burn the arduino, but both the voltage regulator on the board and the LM35 sensor start to heat up. Has anyone an idea on what is going on ?
/*
Analog Input
Demonstrates analog input by reading an analog sensor on analog pin 0 and
turning on and off a light emitting diode(LED) connected to digital pin 13.
The amount of time the LED will be on and off depends on
the value obtained by analogRead().
The circuit:
* Potentiometer attached to analog input 0
* center pin of the potentiometer to the analog pin
* one side pin (either one) to ground
* the other side pin to +5V
* LED anode (long leg) attached to digital output 13
* LED cathode (short leg) attached to ground
* Note: because most Arduinos have a built-in LED attached
to pin 13 on the board, the LED is optional.
Created by David Cuartielles
modified 30 Aug 2011
By Tom Igoe
This example code is in the public domain.
http://arduino.cc/en/Tutorial/AnalogInput
*/
int sensorPin = A0; // select the input pin for the potentiometer
int ledPin = 13; // select the pin for the LED
int sensorValue = 0; // variable to store the value coming from the sensor
void setup() {
// declare the ledPin as an OUTPUT:
pinMode(ledPin, OUTPUT);
}
void loop() {
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
// turn the ledPin on
digitalWrite(ledPin, HIGH);
// stop the program for <sensorValue> milliseconds:
delay(sensorValue);
// turn the ledPin off:
digitalWrite(ledPin, LOW);
// stop the program for for <sensorValue> milliseconds:
delay(sensorValue);
}