//SN 220 Simplified version random number delay and Input Pullup
//Arc welder simple with button configured with PULLUP
//Paul and David Bradt modification
/*
  Input Pull-up Serial

  This example demonstrates the use of pinMode(INPUT_PULLUP). It reads a digital
  input on pin 2 and prints the results to the Serial Monitor.

  The circuit:
  - On-Off Toggle switch attached from pin 2 to ground
  - LED-Resistor connected to Port 7

  Unlike pinMode(INPUT), there is no pull-down resistor necessary. An internal
  20K-ohm resistor is pulled to 5V. This configuration causes the input to read
  HIGH when the switch is open, and LOW when it is closed.
 Oringial INPUT serial developed:
  created 14 Mar 2012
  by Scott Fitzgerald

  This example code is in the public domain.

  https://docs.arduino.cc/built-in-examples/digital/InputPullupSerial/
*/

void setup() {
  //start serial connection
  Serial.begin(9600);
  //configure pin 2 as an input and enable the internal pull-up resistor
  pinMode(2, INPUT_PULLUP);
  pinMode(7, OUTPUT);
}

void loop() {
  //read the pushbutton value into a variable
  int sensorVal = digitalRead(2);
  //print out the value of the pushbutton
  Serial.println(sensorVal);

  // Keep in mind the pull-up means the pushbutton's logic is inverted. It goes
  // HIGH when it's open, and LOW when it's pressed. Turn on pin 13 when the
  // button's pressed, and off when it's not:
  if (sensorVal == HIGH) {
    digitalWrite(7, LOW);
    delay(random(30, 150));
    digitalWrite(7, HIGH);
    delay(random(30, 50));
    
  } else {
    digitalWrite(7, LOW);
  }
}