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Raspberry Pi & IoT Engineering• 5 min read
Pushbuttons & Edge-Triggered Callbacks
Detect physical button presses using hardware interrupts and edge callbacks without pegging the CPU at 100%.
Interrupts vs. Busy Polling
Never write while True: if pin.value == 1:! That burns 100% CPU thread cycles. Instead, use edge-triggered interrupt callbacks like button.when_pressed = my_function.
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Test Yourself With Exercise
Why are interrupt callbacks preferred over continuous while True polling loops when listening for button presses?