상황
A maker wants to drive an LED matrix from an ATtiny85 with minimal GPIO pins.
이 도면에 담긴 내용
그 이면의 의사결정을 읽어 보세요.
01
Use Charlieplexing to control 12 LEDs with only four pins
02
Add series resistors on each GPIO line for current limiting
Small LED matrix projects where GPIO pins are scarce and a compact display is needed.