#include <Wire.h>
#include <LiquidCrystal.h>

// Initialize the library by creating an instance
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int timedata = A0; // analog pin0 , a Potentiometer is connected with A0 pin of Arduino.
int timerawdata = 1; // stores the value coming from the Potentiometer.
int settime = 0; // time duration in milliseconds (initial value)
int startb = 0;  // button to start the welding
int relay = 6;   // the output relay
int ReadyLed = 1; // when this LED is turned ON, it means you can start the welding
int Sflag = 0;   // stops the unnecessary repetition of code.
int spotcount = 0; // counts the amount of spot welds
int refresh = HIGH; // refresh the display


void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  pinMode(startb, INPUT_PULLUP);
  digitalWrite(startb, HIGH);
  pinMode(timedata, INPUT); // POTENTIOMETER CONNECTED
  pinMode(relay, OUTPUT);
  digitalWrite(relay, LOW);
  pinMode(ReadyLed, OUTPUT);
  delay(100);
  digitalWrite(ReadyLed, HIGH);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SPOT WELDER");
  lcd.setCursor(0, 1);
  lcd.print("VERSION 1.0");
  Serial.println("VERSION 1.0");
  delay (3000);
  lcd.clear();
}

void loop() {
  if (timerawdata != analogRead(timedata)){
  timerawdata = analogRead(timedata);
  settime = map(timerawdata, 0, 1023, 1, 1000); // 0.1 to 1000 milliseconds
  refresh = HIGH;
  }

  if (digitalRead(startb) == LOW){
    digitalWrite(ReadyLed, LOW);
    digitalWrite(relay, HIGH);
    delay(settime);
    digitalWrite(relay, LOW);
    digitalWrite(ReadyLed, HIGH);
    spotcount = spotcount + 1;
    refresh = HIGH;
  }

  if (refresh == HIGH){
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("ON Time:");
    lcd.print(settime);
    lcd.print("ms");
    lcd.setCursor(0, 1);
    lcd.print("Pulses:");
    lcd.print(spotcount);
      if (spotcount > 0 && settime < 1000){
      delay (1000 - settime);
    }
    Serial.println(settime);
    refresh = LOW;
  }

  if (digitalRead(startb) == HIGH && spotcount != 0) {
  spotcount = 0;
  }

}