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This example shows how to control the brightness of an LED using the analogWrite() function on the Franzininho DIY.

Materials

  • Franzininho board
  • Breadboard
  • 3mm LED
  • 330 Ohm resistor
  • Male/female jumper wires

Circuit​

On the breadboard you can assemble the LED driving circuit as follows:

Circuit

Sketch​

/*
  Franzininho
  Example: LED Brightness Control - PWM
  This example shows how to control the brightness of an LED using PWM
*/

const int LED = 1; // pin for the LED
int i = 0;         // we will use this variable for auxiliary counting

void setup() {
  pinMode(LED, OUTPUT); // configure the LED pin as an output
}

void loop() {
  // loop from 0 to 255 (gradually turns on)
  for (i = 0; i < 255; i++) {
    analogWrite(LED, i);  // set LED brightness
    delay(10); // wait 10ms, since analogWrite is instantaneous and we wouldn't see any change
  }

  delay(1000);

  // loop from 255 to 1 (gradually turns off)
  for (i = 255; i > 0; i--) {
    analogWrite(LED, i); // set LED brightness
    delay(10);           // wait 10ms
  }

  delay(1000);
}
PWM Outputs

Check the Franzininho DIY pinout to see which pins have PWM output functionality.

Simulation​

Working Video​