September 2011
Beginner
272 pages
7h 38m
English
Content preview from Beginning Arduino ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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State Changes
Because there are only two conditions possible when reading or writing digital inputs and outputs—high and low—we can use this predictability to detect a state change, where a pin changes from high to low or low to high, or even to count these changes. To detect a state change on a digital input, we don’t actually need to know the precise state that the pin is in. Rather, we only need to know when a pin has changed from one state to another.
To do this, we need a way to compare the pin’s current state with the state of the pin the last time we read it. If we check an input and it’s high but the last time we checked it was low, then the button has been pressed. On the other hand, if we check an input and it’s low but last time we ...
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