Use when wiring or coding MAX7219 LED matrix chains, WS2812B/NeoPixel addressable strips, or 16x2/20x4 character LCDs with PCF8574 I2C backpacks on Arduino, ESP32, Raspberry Pi Pico, or Raspberry Pi. Provides exact wiring tables, voltage/level-shifting rules, current budgets, timing constraints, wor
Use when wiring or coding MAX7219 LED matrix chains, WS2812B/NeoPixel addressable strips, or 16x2/20x4 character LCDs with PCF8574 I2C backpacks on Arduino, ESP32, Raspberry Pi Pico, or Raspberry Pi. Provides exact wiring tables, voltage/level-shifting rules, current budgets, timing constraints, working MicroPython/Arduino/Python code patterns, and debugging checklists for displays that show nothi