#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C  lcd(0x27,2,1,0,4,5,6,7); // 0x27 is the I2C bus address for an unmodified module

#define READY_BUTTON 12
#define READY_LED 7 //GREEN
#define FLASH_TRIGGER_PIN 2
#define SENSOR_PIN 11
#define FIRE_LED 4 //BLUE
#define POT_PIN A2
#define STANDBY 0
#define ACTIVE 1
int mode = STANDBY;
int flashDelayMS = 0; 
int NOISE;

void setup() 
{
lcd.setBacklightPin(3,POSITIVE);
lcd.setBacklight(HIGH); 
lcd.begin(16, 2);
lcd.clear();

pinMode(SENSOR_PIN, INPUT);
digitalWrite(SENSOR_PIN, LOW);
pinMode(READY_BUTTON, INPUT_PULLUP);
pinMode(READY_LED, OUTPUT);
digitalWrite(READY_LED, LOW);
pinMode(FLASH_TRIGGER_PIN, OUTPUT);
pinMode(FIRE_LED, OUTPUT);
digitalWrite(FIRE_LED, LOW); 
Serial.begin(9600);
delay(250);
}

void loop() 
{
lcd.setCursor(0,0);
lcd.print("Delay");
flashDelayMS = analogRead(POT_PIN)/4.092; // 0-250 ms
lcd.setCursor(7,0);
lcd.print("    ");
lcd.setCursor(7,0);
lcd.print(flashDelayMS);

if(digitalRead(READY_BUTTON)==LOW)
{
mode = ACTIVE;
}
        if(mode == ACTIVE){
        digitalWrite(READY_LED, HIGH);
        lcd.setCursor(4,1);
        lcd.print("            ");
        lcd.setCursor(4,1);
        lcd.print("READY");
}
NOISE = digitalRead(SENSOR_PIN);
if((mode == ACTIVE)&&(NOISE == 1))
{
delay(flashDelayMS);
//Serial.println(flashDelayMS);
digitalWrite(FLASH_TRIGGER_PIN, HIGH); // fire flash
delay(50);
digitalWrite(FLASH_TRIGGER_PIN, LOW);
digitalWrite(FIRE_LED, HIGH);
delay(2000);
digitalWrite(FIRE_LED, LOW); 
digitalWrite(READY_LED, LOW);
lcd.clear();
mode = STANDBY;

}}