Playing music and tones using a piezo buzzer - library for AVR microcontrollers using timer interrupt | ATmega328

Colorspace conversion between RGB and HSL library code for AVR microcontrollers | ATmega328P

How to control RGB leds | RGB fader library for AVR ATmega328P

Multi-channel software PWM library for AVR microcontrollers | ATmega328P

Binary Code Modulation (BCM) aka Bit Angle Modulation (BAM) library for fading leds for AVR microcontrollers

7 segment display library for AVR microcontrollers | ATmega328P

Read and debounce multiple buttons using interrupt on AVR microcontrollers

millis and micros library for AVR microcontrollers - milliseconds and microseconds time tracking

ISP programming rig for microcontrollers

Constant current LED driver using ATtiny13 - Headlamp flashlight

Capacitive transformerless power supply schematic for PIR motion sensor NV-1111.35

How an outdoor motion PIR sensor switch works with schematic