Outputs & Displays
PWM dimming, seven-segment displays, shift registers and sound.
- PWM: Dimming an LED
Use analogWrite() and a potentiometer to set LED brightness, and see what PWM really does.BeginnerLEDResistorPotentiometer - Seven-Segment Displays: Common Anode vs Common Cathode
Identify your display's polarity and drive digits 0–9 with one switch for either type.IntermediateSeven-segmentResistor - More Outputs with a 74HC595 Shift Register
Drive eight LEDs from three Uno pins with a 74HC595 and shiftOut().Intermediate74HC595LEDResistor - Playing Tones with a Buzzer
Play notes on a passive piezo buzzer with tone(), and know when you need an active buzzer instead.BeginnerBuzzer