In this project, we know about Touch Screen Keypad using Arduino

Required Component

1.Arduino 2. Resistors 3. Nintendo DS touch screen 4. Touch screen breakout 5. connecting wire 6. Breadboard 7. 6×2 LCD Display Module

This book will help you to gain more knowledge about Arduino

Beginning Arduino

Circuit diagram Touch Screen Keypad  Arduino

The other difference is that you will create and print out a keypad to place underneath the touch screen. The standard DS touch screen is 70mm × 55mm (2.75” × 2.16”) so you will need to create a template of this size using an art or word-processing package, and then place a set of evenly spaced keys on the rectangle so it resembles a phone keypad. Figure 12-3 shows the keypad I created. Feel free to use it.

Code Touch Screen Keypad– Arduino:

#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7); // create an lcd object and
assign the pins
// Power connections
#define Left 8 // Left (X1) to digital pin 8
#define Bottom 9 // Bottom (Y2) to digital pin
9
#define Right 10 // Right (X2) to digital pin
10
#define Top 11 // Top (Y1) to digital pin 11
// Analog connections
#define topInput 0 // Top (Y1) to analog pin 0
#define rightInput 1 // Right (X2) to analog pin 1
int coordX = 0, coordY = 0;
char buffer[16];
void setup()
{
lcd.begin(16, 2); // Set the display to 16
columns and 2 rows
lcd.clear();
}
void loop()
{
if (touch())
{
if ((coordX>110 && coordX<300) && (coordY>170 && coordY<360))
{lcd.print("3");}
if ((coordX>110 && coordX<300) && (coordY>410 && coordY<610))
{lcd.print("2");}
if ((coordX>110 && coordX<300) && (coordY>640 && coordY<860))
{lcd.print("1");}
if ((coordX>330 && coordX<470) && (coordY>170 && coordY<360))
{lcd.print("6");}
if ((coordX>330 && coordX<470) && (coordY>410 && coordY<610))
{lcd.print("5");}
if ((coordX>330 && coordX<470) && (coordY>640 && coordY<860))
{lcd.print("4");}
if ((coordX>490 && coordX<710) && (coordY>170 && coordY<360))
{lcd.print("9");}
if ((coordX>490 && coordX<710) && (coordY>410 && coordY<610))
{lcd.print("8");}
if ((coordX>490 && coordX<710) && (coordY>640 && coordY<860))
{lcd.print("7");}
if ((coordX>760 && coordX<940) && (coordY>170 && coordY<360))
{scrollLCD();}
if ((coordX>760 && coordX<940) && (coordY>410 && coordY<610))
{lcd.print("0");}
if ((coordX>760 && coordX<940) && (coordY>640 && coordY<860))
{lcd.clear();}
delay(250);
}
}
// return TRUE if touched, and set coordinates to touchX and
touchY
boolean touch()
{
boolean touch = false;
// get horizontal co-ordinates
pinMode(Top, INPUT); // Top and Bottom to high
impedance
pinMode(Bottom, INPUT);
pinMode(Left, OUTPUT);
digitalWrite(Left, LOW); // Set Left to low
pinMode(Right, OUTPUT); // Set right to +5v
digitalWrite(Right, HIGH);
delay(3);
coordX = analogRead(topInput);
// get vertical co-ordinates
pinMode(Right, INPUT); // left and right to high
impedance
pinMode(Left, INPUT);
pinMode(Bottom, OUTPUT); // set Bottom to Gnd
digitalWrite(Bottom, LOW);
pinMode(Top, OUTPUT); // set Top to +5v
digitalWrite(Top, HIGH);
delay(3);
coordY = analogRead(rightInput);
// if co-ordinates read are less
than 1000 and greater than 24
// then the screen has been touched
if(coordX < 1000 && coordX > 24 && coordY < 1000 && coordY >
24) {touch = true;}
return touch;
}
void scrollLCD() {
for (int scrollNum=0; scrollNum<16; scrollNum++) {
lcd.scrollDisplayLeft();
delay(100);
}
lcd.clear();
}

Enter the code and upload it to your Arduino. Slide the keypad template underneath the keypad with the ribbon cable at the bottom right (next to the E). You can now press the keys on the touch screen and what you press is displayed on the LCD. When you press the C (for Clear) button, the display will clear. When you press the E (for Enter) key, the numbers displayed will scroll to the left until they disappear.

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