Please could some very kind person out there help me with this revision question.
Q)What problems can be encountered when using switches as inputs to a microcomputer and how can these problems be overcome.
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19 years ago
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- posted
19 years ago
Graham Johnson schrieb:
Search for "contact bouncing", e.g.
HTH
Reinhard
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19 years ago
--- A1. Since an open switch presents a nearly infinite impedance to an input, allowing the input to float (no pullup or pulldown resistor) can/will cause problems.
A2. Switches bounce on make and on break, so unless either hardware or software debouncing is done, problems will occur because of the multiple makes/breaks which will happen when the switch is exercised.
-- John Fields