LCD Keypad Shield V2.0 SKU: DFR0374
Contents
1 Introduction
2 Specification
3 Layout
4 Tutorial
4.1 Requirements
4.2 How to Operate
4.2.1 Libraries
4.2.2 Sample Code
Introduction
Our LCD Keypad Shield V2.0 is a 2 line, 16 character Arduino LCD display expansion shield, based
on V1.0. We have simplified the APC interface and the other GPIO pins and retained 5 input buttons:
1 menu select button and 4 control buttons. We have provided a simple Arduino library that makes
screen driving easier and means you do not have to learn complicated LCD working principles to get
it functioning. It is compatible with most Arduino boards, such as UNO and Leonardo.
IOREF pin
for Version 2:
The board's IOREF pin is connected with pin 5V! So when adding the DFR0374 to the stack
of board( controller), the controller's supply voltage would changed to 5V! So it only can be
compatible with the controller working at 5V. If you need to use controller working at other
voltage, e.g. 3.3V, you need
CUT OFF
the IOREF pin of DRI0009.
We are deeply sorry about the mistake! We will revise the design in the next version.
Specification
Operating Voltage: 5V
5 input buttons
Drive Pin: D4~D10
Module size: 54*84mm
1602 blue background liquid crystal display (16 lines, 2 bytes)
Layout
Pin
ANALOG
A0
DIGITAL 4
DIGITAL 5
DIGITAL 6
DIGITAL 7
DIGITAL 8
DIGITAL 9
DIGITAL
10
Function
BUTTON (SELECT, UP, RIGHT,
DOWN，LEFT)
DB4
DB5
DB6
DB7
RS (DATA OR SELECT)
ENABLE
Backlight Control
Tutorial
Requirements
Hardware
UNO x1
LCD Keypad Shield V2.0 x1
Software
Arduino IDE V1.6.5
Click to Download Arduino IDE
https://www.arduino.cc/en/Main/Software
How to Operate
Libraries
Download and install the LiquidCrystal Library: Click here to download library files (Arduino
Library Installation Tutorial)
https://github.com/CainZ/LiquidCrystal/raw/master/LiquidCrystal.zip
https://www.arduino.cc/en/Guide/Libraries#.UxU8mdzF9H0
Next, open the Arduino IDE and copy the following code to the IDE window.
Select the correct serial port (the serial port varies depending on your machine) and board (Arduino
UNO).
When the code has successfully uploaded, try pressing buttons on the shield observe what happens
with the LCD.
Sample Code
#include <LiquidCrystal.h>
/*******************************************************
This program is used to test the LCD module display and 5 buttons.
********************************************************/
// Select the pin used on LCD
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
// define the button
int lcd_key
= 0;
int adc_key_in = 0;
#define
#define
#define
#define
#define
#define
btnRIGHT
btnUP
btnDOWN
btnLEFT
btnSELECT
btnNONE
0
1
2
3
4
5
//read the button value
int read_LCD_buttons()
{
adc_key_in = analogRead(0);
// read analog A0 value
// when read the 5 key values in the vicinity of the following：
0,144,329,504,741
// By setting different threshold, you can read the one button
if (adc_key_in > 1000) return btnNONE;
if (adc_key_in < 50)
return btnRIGHT;
if (adc_key_in < 250) return btnUP;
if (adc_key_in < 450) return btnDOWN;
if (adc_key_in < 650) return btnLEFT;
if (adc_key_in < 850) return btnSELECT;
//
/*
if
if
if
if
if
*/
V1.0 Use the following version threshold：
(adc_key_in
(adc_key_in
(adc_key_in
(adc_key_in
(adc_key_in
<
<
<
<
<
50)
195)
380)
555)
790)
return
return
return
return
return
btnRIGHT;
btnUP;
btnDOWN;
btnLEFT;
btnSELECT;
return btnNONE;
}
void setup()
{
lcd.begin(16, 2);
// star
lcd.setCursor(0,0);
lcd.print("Push the buttons"); // display“Push the buttons”
}
void loop()
{
lcd.setCursor(9,1);
spaces
lcd.print(millis()/1000);
lcd.setCursor(0,1);
second line.
lcd_key = read_LCD_buttons();
switch (lcd_key)
{
case btnRIGHT:
{
lcd.print("RIGHT ");
break;
}
case btnLEFT:
{
lcd.print("LEFT
");
break;
}
// The cursor is set at second. and have 9
// Output waiting time
// The cursor moves to the beginning of the
// read key
// display key
case btnUP:
{
lcd.print("UP
");
break;
}
case btnDOWN:
{
lcd.print("DOWN ");
break;
}
case btnSELECT:
{
lcd.print("SELECT");
break;
}
case btnNONE:
{
lcd.print("NONE ");
break;
}
}
}
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