/*
   Project:       Pull Up/Down Demo
   Description:   Demonstrates button wiring and
                  pin setup for pull up or pull down
   Creation date: 5/1/23
   Author:        AnonEngineering

   License: Beerware
*/

const int PULL_DN_BTN = 4;
const int PULL_UP_BTN = 5;

int oldPullDnState = HIGH; // pin will idle low
int oldPullUpState = LOW;  // pin will idle high

void setup() {
  Serial.begin(9600);
  pinMode(PULL_DN_BTN, INPUT);        // pulldown, needs external resistor
  pinMode(PULL_UP_BTN, INPUT_PULLUP); // pullup, uses internal resistor
  Serial.println("Ready...\n");
}

void loop() {
  int pullUpState = digitalRead(PULL_UP_BTN);
  int pullDnState = digitalRead(PULL_DN_BTN);
  if (pullUpState != oldPullUpState || pullDnState != oldPullDnState)  {
    oldPullUpState = pullUpState;
    oldPullDnState = pullDnState;
    Serial.print("Pull up pin state is:\t");
    //Serial.println(pullUpState);
    Serial.println(pullUpState ? "HIGH" : "LOW");
    Serial.print("Pull down pin state is:\t");
    //Serial.println(pullDownState);
    Serial.println(pullDnState ? "HIGH" : "LOW");
    Serial.println();
  }
  delay(50);  // debounce
}