[Rupam]

The objective of this project is to develop a product
counter that can efficiently count the products and display in LCD. The project
is based on the mechanism of variation of voltage across a LDR when a product
or opaque body is placed between LDR and an IR transmitter. ATMEG 368
microcontroller based Arduino board keeps monitoring the change of voltage and
whenever there is a change above threshold( i.e. a product is placed in
between) the system increases the count and displays in LCD. Also the display
can be seen in PC through Serial Communication.

[Jordan Malan1]

I'm very new to this, but from what I see (and my failure to get your code to compile in Arduino 1.0.1) I don't have the Header files you reference in your code?
( #include <LiquidCrystal.h> and #include "Timer.h")

where can I find this code?

other than it doesn't work for me, I like the idea and your explanation of theory and practice is good, thanks!

[Rupam]

    C Programming

#include <LiquidCrystal.h>
 
const int BACK_LIGHT = 13;          // Pin 13 will control the backlight
const char* MESSAGE = "Grasshopper";
char str[16]="Count=%d";
char data[16]="Analog Value:";
const int MESSAGE_LENGTH = 11;
const int DISPLAY_WIDTH = 16;
int count=0;
 
Timer t;
int pin = 13;
int val=0;
int STATE=-1;  //1 means ready for count 
 
int irEvent=-1;
// Connections:
// RS (LCD pin 4) to Arduino pin 12
// RW (LCD pin 5) to Arduino pin 11
// Enable (LCD pin 6) to Arduino pin 10
// LCD pin 15 to Arduino pin 13
// LCD pins d4, d5, d6, d7 to Arduino pins 5, 4, 3, 2
LiquidCrystal g_lcd(12, 11, 10, 6,5, 4, 3);
 
void setup()
{
    pinMode(BACK_LIGHT, OUTPUT);
    digitalWrite(BACK_LIGHT, HIGH); 	// Turn backlight on. 
			        	// Replace 'HIGH' with 'LOW' to turn it off.
    g_lcd.begin(16,2);                  	// Start with a blank screen
 
    Serial.begin(9600);
    g_lcd.clear();
    delay(10000);
}
 
void loop()
{
    //  g_lcd.clear();
    g_lcd.home();
 
      g_lcd.setCursor(0, 0);
      sprintf(str,"Count=%d",count);
      g_lcd.print(str);
 
 
 
      val=analogRead(0);
      if(val>900)
      {
        count++;
        delay(1000);
      }
      sprintf(data,"%s%d","Value=",val);
      g_lcd.setCursor(0, 1);
      g_lcd.print(data);
            /*
         for(i=0; i<5; i++)
        {
            g_lcd.setCursor(i, 0);
            g_lcd.print(str[s_nPosition + i]);
 
        }*/
        Serial.println("Here");
 
 
    delay(500);
}

[Rupam]

Hello Timer is an external library we build and by default it was added. You can compile without Timer.h. LiquidCrystal.h comes with arduino itself. I think the above code should run now.

In case it does not work, kindly post the exact compiler error. ( I hope that would not be required though )