You can use the circuit in Figure 1 to drive a bicolor LEDwith only two leads. This circuit detectsthe correct closed condition of theleft and right side bags in a motorcyclecompanion. The bag has two ...

But [Martin Held] built a super simple LED Christmas tree ornament using the ATSAME51 series micro-controller, which he regularly works with and had on hand, and lots of bi-color LEDs. He already ...