Hardware & IoTLesson 102Free preview

RasPi Flowing LEDs

This lesson is part of Node.js · All levels

Summary

This lesson developed the LED project into a flowing effect that wipes out several LEDs in a row. You'll learn the setup of many pins through arrays, string repetitions, and precise timing. This project trains the organization of the code to control multiple outputs at once.

Key points

List some LEDs (e.g. GPIO 17, 27, 22, 5, 6) in the array of Gpio objects.
The back and forth is done with two repetitions: from start to finish and vice versa.
Adjust the interval (e.g. 150 ms) for a good viewable spinning speed.
Turn off all LEDs before turning on the next LED to keep the effect clean.
Export all pins at the end of the program; use the util function to turn them all off at once.

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