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47 lines
1.1 KiB
47 lines
1.1 KiB
#pragma once
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class Button {
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public:
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Button (uint8_t pin, bool pullup = false, uint16_t debounceDelay = 50)
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: _pin(pin), _state(LOW), _lastState(LOW),
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_lastMillis(0), _debounceDelay(debounceDelay),
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_lastDebounceTime(0) {
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if (pullup == true) {
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pinMode(_pin, INPUT_PULLUP);
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} else {
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pinMode(_pin, INPUT);
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}
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}
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// Debounces the button and returns the state if it was just changed.
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bool check(bool triggerState = LOW) {
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bool reading = digitalRead(_pin);
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// Checks if the buttons has changed state
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if (reading != _lastState) {
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_lastDebounceTime = millis();
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}
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// Checks if the buttons hasn't changed state for '_debounceDelay' milliseconds.
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if ((millis() - _lastDebounceTime) > _debounceDelay) {
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// Checks if the buttons has changed state
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if (reading != _state) {
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_state = reading;
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return _state;
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}
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}
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_lastState = reading;
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// If this code is reached, it returns the normal state of the button.
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if (triggerState == HIGH) {
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return LOW;
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} else {
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return HIGH;
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}
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}
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private:
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const uint8_t _pin;
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bool _state;
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bool _lastState;
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uint32_t _lastMillis;
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uint16_t _debounceDelay;
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uint32_t _lastDebounceTime;
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};
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