The Analog pins on the Arduino or DFR Romeo can be used to adjust the brightness of a LED.
The analog pin takes anything between 0 and 255. 0 means off, 255 means the brightest. Make sure you resist the voltage using a suitable resitor to preserve the LED life.
Connect the long leg of the LED to pin 9, and the short leg to a resistor before connecting it to ground.
Connect the three legs of a potentiometer to 3 pins.
Copy and paste the codes below and try it out.
int ledPin = 9; // LED connected to digital pin 9
int analogPin = 3; // potentiometer connected to analog pin 3
int val = 0; // variable to store the read valuevoid setup()
{
pinMode(ledPin, OUTPUT); // sets the pin as output
}
int analogPin = 3; // potentiometer connected to analog pin 3
int val = 0; // variable to store the read valuevoid setup()
{
pinMode(ledPin, OUTPUT); // sets the pin as output
}
void loop()
{
val = analogRead(analogPin); // read the input pin
analogWrite(ledPin, val / 4); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255
}
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