Microcontroller GPIOs are often used to turn some functionality on or off, so these GPIOs have two states.
When you want to signal this state, your microcontroller can handle this and i.e. use additional GPIOs to drive signal LEDs, or even use displays. This however adds complexity to the microcontroller programming, and requires additional GPIOs.
In this article, I am looking at signal state LED that require no additional programming and no additional GPIOs.
Design Approaches
Here are the design approaches discussed:
- Using two separate LEDs on one GPIO
- Using a bi-polar bi-color LED
- Using a RGB or three-legged bi-color LED
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(content created Aug 11, 2024 - last updated Aug 28, 2024)