POT_BTN_EXAMPLE_Gist

//
// Copyright (c) 2019 Conplug (https://conplug.com.tw)
// Author: Hartman Hsieh
//
// Description :
//   None
//
// Connections :
//   Plug "POT_BTN V1.0" module at "JA6D4".
//
// Required Library :
//   None
//

int PinVal = 0;

unsigned long PreviousTriggerTime = 0;

void PciSetup(byte pin)
{
    *digitalPinToPCMSK(pin) |= bit (digitalPinToPCMSKbit(pin));  // enable pin
    PCIFR  |= bit (digitalPinToPCICRbit(pin)); // clear any outstanding interrupt
    PCICR  |= bit (digitalPinToPCICRbit(pin)); // enable interrupt for the group
}

//
// Handle pin change interrupt for D0 to D7 here
//
ISR (PCINT2_vect)
{
  PinVal = digitalRead(4);

  if (PinVal == 1) { // Key Down
    if ((millis() - PreviousTriggerTime) > 300) { // Prevent trigger many times at one key pressing.
      Serial.println("Key Down");
      PreviousTriggerTime = millis();
    }
  }
}  

void setup() {  
  
  Serial.begin(9600);

  //
  // Enable interrupt for D4
  //
  PciSetup(4);

}
 
 
void loop() {

  //
  // Print the value of analog input.
  //
  Serial.println(analogRead(A6));

  delay (500);
}