In this demo, it will show you how does it affects the delay value of LED lights by using the potentiometer in analogRead() function. This means that it will map input voltage between 0 and 5 V into integer values between 0 and 1023. This yields a resolution between readings of: 5 volts / 1024 units or, .0049 volts (4.9 mV) per unit. As you can see, from the video, the value inserted to the delay of LED pin output. So when the potentiometer rotate to the left, the delay is smaller, that’s why the LED is blinking fast. Same as when its turning to the right, the delay is increasing.

Read more: analogRead();

Review:

What is Potentiometer?

A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.

Materials Need:

1  x    gizDuino PLUS ATmega644P Starter kit

1 x    Red LED 5mm

1  x   560 Ohms

1  x   10K Potentiometer

1  x   USB Cable

6 x  1pin Jumper wire (male-male)

Schematic Diagram:

Wiring Connection:

Digital pin 13 —> (+) Anode LED

(-) Cathode —> 560 Ohms —> Ground

Code:

	/*
	"GizDuino Starter kit"
	Potentiometer Sample code
	STEP 1: Construct the circuit of GizDuino Potentiometer.
	STEP 2: Connect the USB Cable to your computer.
	STEP 3: Open the Arduino IDE.
	STEP 4: Open the Potentiometer Sample code from GizDuino Starter kit code.
	STEP 5: Then, click Upload.
	*/
	//potPin is the givenname for analog pin 0;
	int potPin = 0;
	// led is the givenname for digital pin 13.
	int LEDPin = 13;
	// the setting up of pins.
	void setup()
	{
	// initialize the digital pin as an output.
	pinMode(LEDPin, OUTPUT);
	}
	// the loop is where your program runs repeatedly.
	void loop()
	{
	int potValue; // potValue is declared in this scope
	potValue = analogRead(potPin); // read analog pin 0 or potPin
	digitalWrite(LEDPin, LOW); // LED is OFF
	delay(potValue); // it depends on the potValue readings
	digitalWrite(LEDPin, HIGH); // LED is ON
	delay(potValue); //it depends on the potValue readings
	}

view rawPotentiometer.ino hosted with  by GitHub