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Tut10 Ten Arduino Projects For Absolute Beginners
P6 Analog In Out Serial
Project 6: Use a Potentiometer to Dim a LED (AnalogInOutSerial)
Created on: 2 August 2012
An analog value on the Arduino pin A0 is changed using a potentiometer. The value read on this pin is used to change the brightness of an LED connected to Arduino pin 9.
Parts Needed
- 1 × LED (e.g. 3mm or 5mm red or green LED)
- 1 × 220 ohm resistor (1/4W 5%)
- 1 × 10k potentiometer
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Arduino Website Page
In the Arduino IDE
File → Examples → 3.Analog → AnalogInOutSerial
Building the Circuit
Find the circuit diagram on the AnalogInOutSerial page of the Arduino website.
The LED is connected as was done in project 3 above and the potentiometer is connected as was done in project 1.
Programming and Operating the Circuit
In the Arduino IDE, select File → Examples → 3.Analog → AnalogInOutSerial to open the sketch for this project. Upload the sketch to the Arduino board.
Turn the potentiometer shaft in one direction to see the LED get brighter. Turn the potentiometer shaft in the other direction to see the LED get dimmer.
Leave the potentiometer connected for the next project.
Project 6 Video
Can't see the video? View on YouTube →
