They taught me a lot of things at university. Unfortunately, they neglected to mention the topic of switch bounce. If you are a practicing engineer working with electronic systems, you will almost certainly have run into this problem. If you are new to the field, you can be assured that the delights of switch bounce are lurking out there waiting for an opportunity to bid you a cheery “Hello!” Be afraid; be very afraid.
The way things used to work in the not-so-distant past is that junior engineers were instructed as to the switch-bounce solution(s) favored by their more senior colleagues. In turn, those fonts of knowledge were instructed by their mentors, and so on and so forth deep into the mists of time. As a result, there are now so many solutions scattered around the internet — where most young engineers now go to satiate their craving for knowledge — that it makes your head spin. On the bright side, some of these offerings actually work; on the downside, their working may be due to chance rather than design.
The series of seven articles goes into detail on what debounce is and how it may be done correctly. Start here.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.