![]() Rather than a bunch of bounces, we can see a rather smooth curve! Exactly what we’d expect! The capacitor stores and charge, and releases it with each bounce smoothing out the connection process (at least from the perspective of any connected devices, ICs, or micro-controllers).ĭebouncing a switch with hardware comes at a price though. If we pop out the trusty oscilloscope we can actually watch bounce happening on the screen! Many also think that bounce is only a problem with momentary switches, but the truth is that bounce affects all types of momentary and maintained switches, including toggles, latching, and rocker switches. Even two identical switches can bounce differently! And this isn’t as simple of a task as it might at first seem! That’s because different switches have different bounce characteristics. We need to first understand switch bounce and its characteristics. We’re going to walk through both ways of doing it and talk about the differences. ![]() We deal with this by debouncing the circuit!ĭebouncing can be accomplished in hardware or in software and there are pros and cons to each method. This bounce can cause problems with some circuits, which will result in the hardware incorrectly reading multiple switch presses, when in fact only one occurred. In some cases this bounce can also be electrical in nature if arcing occurs due to bad or corroded contacts on the switch. However, in reality as they make contact they mechanically bounce, making brief contact several times before making a solid connection. ![]() It might seem like they make immediate contact and complete a circuit. ![]() When you flip a switch or press a button two metal contacts come together. ![]()
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