![]() ![]() Alternatively, contact circuits can be low-pass filtered to reduce or eliminate multiple pulses. The effects of contact bounce can be eliminated (debounced) by use of mercury-wetted contacts, but these are now infrequently used because of the hazard of mercury release. ![]() The effect of bouncing is usually unimportant in power circuits but causes problems in some analog and digital circuits that respond fast enough to misinterpret the on‑off pulses as a data stream and as such even though bouncing occurs within a millisecond time frame, the microcontroller often works at a faster speed and may fail or succeed to register the press of the switch due to the state of the bounce. This result in a rapidly pulsed electric current instead of a clean transition from zero to full current as shown in the graph below. Switch and relay contacts are usually made of springy metals so when a switch is pressed, its essentially two metal parts coming together and even though the connection may seem already made to the user, it may not happen immediately, as a matter of fact, it may make contact on one side – then both – and then the other side –, technically bouncing between in-contact and not-in-contact until it finally settles down. This occurrence is due to a property of switches known as bounciness which is as a result of the physical property of the switches.Ĭontact bounce (also called chatter) is a common problem with mechanical switches and relays. When we press a button once it may register twice and when we press it four times, in a row, for instance, it may register just twice. One of the major problems encountered when using push buttons and switches in digital electronics project is the problem of bouncing.
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