/*Battery Spot Welder Timer
   This sketch will use an arduino to send a pulse through an SSR or SSC to weld tabs onto a battery
   A push button switch, LED Display, SSC or SSR, 5V source, Potentiometer, arduino type board will be needed
   Even Though this or similiar sketch is probably available online, I want to create it myself so I learn and
   get practice using it.

   The Potentiometer will be used to set the pulse length.  The LED will be used to display the length of pulse


   Ryan C. Lash modified by zeph with an i2c lc
   25 June 2018
   [email protected]
   Melbourne, Florida

*/

/*First part of code sets up potentiometer.  Pot needs to be hooked up to 5V and ground board. and middle pin
   goes to A0 as code is written.

   The next part of the code is for the LED readout to show how long the pulse will be.  I will probably skip this part
   until I physically begin to install the arduino onto the welder, and use the serial log to test the code as best I can

   The last part of the code is to send a timed pulse to the SSR to send the welding current to do the weld.


*/


const int trigger = 2;
//The button or trigger to fire the welder will be hooked up to digital pin number 2
//The pin number 2 will have a 10k Ohm resistor that pulls pin high when trigger is pressed
//Need to double check trigger wiring
const int SSC = 8;
const int SSCLED = 13;
//This is the digital pin that the Solid State Relay will be conected to.
//High is true or Fire and Low is false or off
#include <LCD_I2C.h>

LCD_I2C lcd(0x27);
void setup() {
  lcd.begin(); // If you are using more I2C devices using the Wire library use lcd.begin(false)
  // this stop the library(LCD_I2C) from calling Wire.begin()
  lcd.backlight();

  pinMode(trigger, INPUT);
  pinMode(SSC, OUTPUT);


  //boot sequence
  lcd.setCursor(0, 0);
  lcd.print("  THE NERDLING");
  lcd.setCursor(0, 1);
  lcd.print("  SPOT  WELDER");


  //test status led
  digitalWrite(SSCLED, HIGH);
  delay(2000);
  digitalWrite(SSCLED, LOW);
}

void loop() {

  int potValue = analogRead(A2);       //reads value of analog pin0, 0 is low 1023 is fullt
  float pulseTime = float(potValue) / 1023;

  //this calculates pulse time in terms of fraction of a second
  //need to verify no problems with variable types int and float
  //This range is way shorter and way longer than it needs to be will edit code during testing

  //Read the input pin:
  int fireTrigger = digitalRead(trigger);
  if (fireTrigger == 1) {
    digitalWrite(SSC, HIGH);
    digitalWrite(SSCLED, HIGH);


    //shows status on screen
    lcd.setCursor(0, 1);
    lcd.print("Triggered       ");

    delay(pulseTime * 1000); //Edited on forum (06/28/2018) fixed mistake:  Multiply rather than divide

    digitalWrite(SSC, LOW);
    digitalWrite(SSCLED, LOW);

    delay(2000);
    //This puts a delay to prevent a second pulse and gives time for wires to cool
  }
  else {
    digitalWrite(SSC, LOW);
  }

  // print out the value you read:
  lcd.setCursor(0, 0);
  lcd.print("Pulse Time=");
  lcd.print(pulseTime);
  lcd.print("S");
  //lcd.println(potValue);

  lcd.setCursor(0, 1);
  lcd.print("Ready           ");

  delay(150);        // delay in between reads for stability
}