Controlling the LED Brightness #Learn Arduino

Finally I can go up from blink to another basic of Arduino. In this circuit we can control the brightness of LED with potentiometer.LED brightness is determined from the position knob on the potentiometer.

Some material we need:

• Arduino (I am using Arduino UNO)
• LED
• Potentiometer 10K ohm
• 330 Ohm resistor
• PC/laptop
• Breadboard
• 6 jumperwire
• Data cable from Arduino to PC 

 Here is the code that we can simply copying from Arduino IDE example:

	/*
	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);
	}

view raw potentiometer.ino hosted with ❤ by GitHub

the new things we learn in here is "sensorPin =A0". It means that we select the input pin for the potentiometer. To read the value from the sensor we just type "sensorValue = analogRead(sensorPin);"  inside the loop.