DebounceSwitch

A c++ class for de-bouncing a mechanical switch.

The required parameters are:
- the GPIO input pin #
- a flag that's true if using an internal pullup resistor, or false otherwise
- a pair of callback functions that get called when the input pin goes either low or high
- a debounce delay in milliseconds
The initPin() member function must be called first. It configures the input pin, and returns the inital state of the switch.
The readPin(debounceDelay) member function returns the current state (de-bounced), and calls the appropriate callback function whenever the pin's state changes.

#include "DebounceSwitch.h"

#define swPin 12                
#define intPullup true          // ! use internal pullup resistor?

void loCallback(), hiCallback();
DebounceSwitch mySwitch(swPin, intPullup, loCallback, hiCallback);

void setup() {
.
.
. 
  bool swStateInit = mySwitch.initPin();  // initialize switch
}

void loop() {
  int debounceDelay = 50;       // (ms)
  bool swState = mySwitch.readPin(debounceDelay); 
}

void loCallback() {
  Serial.println("Input just went LOW.");
}

void hiCallback() {
  Serial.println("Input just went HIGH.");
}

Included is an example Platform IO project. You can choose between platforms using a single pre-processor statement. Be sure to select the correct environment before compiling - see the screenshots below.

[env:nano_every]
platform = atmelmegaavr
board = nano_every
framework = arduino
monitor_speed = 115200

[env:esp12e]
platform = espressif8266
board = esp12e
framework = arduino
monitor_speed = 115200