10K Breadboard Potentiometer - Revision history

Katherine.d: /* Overview */

2012-12-07T09:32:53Z

‎Overview

Katherine.d at 09:31, 7 December 2012

2012-12-07T09:31:49Z

Katherine.d: /* Overview */

2012-12-05T09:55:27Z

‎Overview

Katherine.d: /* Overview */

2012-12-05T09:44:27Z

‎Overview

Katherine.d: /* Overview */

2012-12-05T09:39:04Z

‎Overview

Katherine.d: /* Overview */

2012-12-05T09:35:47Z

‎Overview

Katherine.d: Created page with "==Overview== A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. In this example, that value co..."

2012-12-05T09:17:50Z

Created page with "==Overview== A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. In this example, that value co..."

New page

==Overview==

A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. In this example, that value controls the rate at which an LED blinks.

We connect three wires to the Arduino board. The first goes to ground from one of the outer pins of the potentiometer. The second goes from 5 volts to the other outer pin of the potentiometer. The third goes from analog input 2 to the middle pin of the potentiometer.

By turning the shaft of the potentiometer, we change the amount of resistence on either side of the wiper which is connected to the center pin of the potentiometer. This changes the relative "closeness" of that pin to 5 volts and ground, giving us a different analog input. When the shaft is turned all the way in one direction, there are 0 volts going to the pin, and we read 0. When the shaft is turned all the way in the other direction, there are 5 volts going to the pin and we read 1023. In between, analogRead() returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.

==Sample Code==

<syntaxhighlight lang="c">

/* Analog Read to LED
* ------------------
*
* turns 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(). In the easiest case we connect
* a potentiometer to analog pin 2.
*
* Created 1 December 2005
* copyleft 2005 DojoDave <http://www.0j0.org>
* http://arduino.berlios.de
*
*/

int potPin = 2; // select the input pin for the potentiometer
int ledPin = 13; // select the pin for the LED
int val = 0; // variable to store the value coming from the sensor

void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}

void loop() {
val = analogRead(potPin); // read the value from the sensor
digitalWrite(ledPin, HIGH); // turn the ledPin on
delay(val); // stop the program for some time
digitalWrite(ledPin, LOW); // turn the ledPin off
delay(val); // stop the program for some time
}

</syntaxhighlight>

@@ Line 1: / Line 1: @@
 == Overview ==
-A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. Shown in Figure 8.1 is a simple 10K breadboard potentiometer.
+A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. Shown in the Figure below is a simple 10K breadboard potentiometer.
 [[File:potentiometer.jpg | 400px]]
 This board works with 5V DC power supply. It has three pins: +5V, GND, and Out, where the Pin Out is the voltage output that varies with resistance.
 == Example Project ==

← Older revision		Revision as of 09:55, 5 December 2012
Line 11:		Line 11:


−	'''10K Breadboard Potentiometer '''	+	*'''10K Breadboard Potentiometer '''

	[[File:potentiometer.jpg \| 400px]]		[[File:potentiometer.jpg \| 400px]]

@@ Line 13: / Line 13: @@
 '''10K Breadboard Potentiometer '''
-[[File:potentiometer.jpg]]
+[[File:potentiometer.jpg | 400px]]
 ==Sample Code==

← Older revision		Revision as of 09:35, 5 December 2012
Line 7:		Line 7:


−	By turning the shaft of the potentiometer, we change the amount of resistence on either side of the wiper which is connected to the center pin of the potentiometer. This changes the relative "closeness" of that pin to 5 volts and ground, giving us a different analog input. When the shaft is turned all the way in one direction, there are 0 volts going to the pin, and we read 0. When the shaft is turned all the way in the other direction, there are 5 volts going to the pin and we read 1023. In between, analogRead() returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.	+	By turning the shaft of the potentiometer, we change the amount of resistence on either side of the wiper which is connected to the center pin of the potentiometer. This changes the relative "closeness" of that pin to 5 volts and ground, giving us a different analog input. When the shaft is turned all the way in one direction, there are 0 volts going to the pin, and we read 0. When the shaft is turned all the way in the other direction, there are 5 volts going to the pin and we read 1023. In between, analogRead() returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.
		+
		+	[[File:potentiometer.jpg]]

	==Sample Code==		==Sample Code==

@@ Line 1: / Line 1: @@
-==Overview==
+== Overview ==
-A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. In this example, that value controls the rate at which an LED blinks.
+A potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value. Shown in Figure 8.1 is a simple 10K breadboard potentiometer.
-We connect three wires to the Arduino board. The first goes to ground from one of the outer pins of the potentiometer. The second goes from 5 volts to the other outer pin of the potentiometer. The third goes from analog input 2 to the middle pin of the potentiometer.
+This board works with 5V DC power supply. It has three pins: +5V, GND, and Out, where the Pin Out is the voltage output that varies with resistance.
-By turning the shaft of the potentiometer, we change the amount of resistence on either side of the wiper which is connected to the center pin of the potentiometer. This changes the relative "closeness" of that pin to 5 volts and ground, giving us a different analog input. When the shaft is turned all the way in one direction, there are 0 volts going to the pin, and we read 0. When the shaft is turned all the way in the other direction, there are 5 volts going to the pin and we read 1023. In between, analogRead() returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.
+By turning the shaft of the potentiometer, we change the amount of resistance on either side of the wiper which is connected to the center pin of the potentiometer.  This changes the relative "closeness" of that pin to +5V and Ground, giving us a different analog input. When the shaft is turned all the way in one direction, there are 0V going to the pin, and we read 0. When the shaft is turned all the way in the other direction, there are 5V going to the pin and we read 1023. In between, the function analogRead( ) returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.
-==Sample Code==
+'''The source code is attached below. '''
 <syntaxhighlight lang="c">