| /* | |
| 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 | |
| center pin of the potentiometer to the analog input 0 | |
| one side pin (either one) to ground | |
| the other side pin to +5V | |
| - LED | |
| anode (long leg) attached to digital output 13 through 220 ohm resistor | |
| 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. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/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); | |
| } | |