IoT - Modular - Buttons.h

 1 class PushButton {
 2 
 3 public:
 4 
 5 PushButton(uint8_t pin) // Constructor (executes when a PushButton object is created)
 6 
 7 <nowiki>:</nowiki> pin(pin) { // remember the push button pin
 8 
 9 pinMode(pin, INPUT_PULLUP); // enable the internal pull-up resistor
10 
11 };
12 
13 bool isPressed() // read the button state check if the button has been pressed, debounce the button as well
14 
15 {
16 
17 bool pressed = false;
18 
19 bool state = digitalRead(pin);               // read the button's state
20 
21 int8_t stateChange = state - previousState;  // calculate the state change since last time
22 
23 if (stateChange == rising) { // If the button is pressed (went from high to low)
24 
25 if (millis() - previousBounceTime > debounceTime) { // check if the time since the last bounce is higher than the threshold
26 
27 pressed = true; // the button is pressed
28 
29 }
30 
31 }
32 
33 if (stateChange == falling) { // if the button is released or bounces
34 
35 previousBounceTime = millis(); // remember when this happened
36 
37 }
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39 previousState = state; // remember the current state
40 
41 return pressed; // return true if the button was pressed and didn't bounce
42 
43 };
44 
45 private:
46 
47 uint8_t pin;
48 
49 bool previousState = HIGH;
50 
51 unsigned long previousBounceTime = 0;
52 
53 const static unsigned long debounceTime = 1000;
54 
55 const static int8_t rising = HIGH - LOW;
56 
57 const static int8_t falling = LOW - HIGH;
58 
59 };