#include <Wire.h>
#include <Adafruit_RGBLCDShield.h>
#include <utility/Adafruit_MCP23017.h>

Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();

int qty = 0; // quantity of parts counted
int del = 50; // global debounce duration for buttons
int set = 0; // user input number of parts to be counted
uint8_t i = 0; // reads button input
const int signalPin = A0; // set up a constant for the photointerrupt signal pin
int switchState = 0; // variable to hold the value of the switchPin
int prevSwitchState = 0; // variable to hold previous value of the switchpin
int pwr = 13; // power pin to vibration on/off relay

void setup()
{
pinMode(signalPin, INPUT); // set up the switch pin as an input
pinMode(pwr, OUTPUT); // set pwr pin to output
lcd.begin(16, 2); // set up the LCD's number of columns and rows
lcd.setCursor(0, 0);
lcd.print("SET QTY"); // print LCD column headers
}

void loop()
{
lcd.setCursor(0, 1);
lcd.print(set); // print "set" to LCD
lcd.setCursor(13, 1);
lcd.print(qty); // print "qty" to LCD

uint8_t buttons = lcd.readButtons();

if (buttons) // if any button is pressed
{
lcd.setCursor(0, 1);
lcd.print(" "); //clear LCD bottom row for new values

if (buttons & BUTTON_UP && set <= 998) // if "UP" button is pressed
{
set = set + 1; // increase "set" value by one
delay(del); // debounce
}

if (buttons & BUTTON_DOWN && set >= 1) // if "DOWN" button is pressed
{
set = set - 1; // decrease "set value by one
delay(del); //debounce
}

if (buttons & BUTTON_RIGHT && set <= 989) // if "RIGHT" button is pressed
{
set = set + 10; // increase "set" value by ten
delay(del); // debounce
}

if (buttons & BUTTON_LEFT && set >= 10) // if "LEFT" button is pressed
{
set = set - 10; // increase "set" value by ten
delay(del); // debounce
}

if (buttons & BUTTON_SELECT) // if "SELECT" button is pressed
{
digitalWrite(pwr, HIGH); // start vibration
delay(del); // debounce
}
}

 

switchState = analogRead(signalPin); // check the status of the photointerrupt

if (switchState != prevSwitchState) // compare the switchState to its previous state
{
if (switchState == LOW) // if photointerrupt detects a part
{
qty = qty + 1; // increment part count by one
delay(20); // debounce
}
}

{
if (qty == set)
{
delay(400); // delay to clear ramp of counted pieces before stopping vibration.
digitalWrite(pwr, LOW); // stop vibration
qty -= qty; // reset counted part quantity
lcd.setCursor(14, 1);
lcd.print(" "); // write LCD qty zero
}
prevSwitchState = switchState; // reset photointerrupt's state
}
}