Arduino LCD Keypad Shield features an on board 16X2 LCD and a keypad consisting of six keys. The keys are-Select,Left,Right,Up,Down and Reset. The shield features all necessery pinouts with which you can interface any other device with the shield even when it is already connected to Arduino.
Diagram
Example use of LiquidCrystal library
//Sample using LiquidCrystal library #include <LiquidCrystal.h> /******************************************************* This program will test the LCD panel and the buttons Mark Bramwell, July 2010 ********************************************************/ // select the pins used on the LCD panel LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // define some values used by the panel and buttons int lcd_key = 0; int adc_key_in = 0; #define btnRIGHT 0 #define btnUP 1 #define btnDOWN 2 #define btnLEFT 3 #define btnSELECT 4 #define btnNONE 5 // read the buttons int read_LCD_buttons() { adc_key_in = analogRead(0); // read the value from the sensor // my buttons when read are centered at these valies: 0, 144, 329, 504, 741 // we add approx 50 to those values and check to see if we are close if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result // For V1.1 us this threshold 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; // For V1.0 comment the other threshold and use the one below: /* if (adc_key_in < 50) return btnRIGHT; if (adc_key_in < 195) return btnUP; if (adc_key_in < 380) return btnDOWN; if (adc_key_in < 555) return btnLEFT; if (adc_key_in < 790) return btnSELECT; */ return btnNONE; // when all others fail, return this... } void setup() { lcd.begin(16, 2); // start the library lcd.setCursor(0,0); lcd.print("Push the buttons"); // print a simple message } void loop() { lcd.setCursor(9,1); // move cursor to second line "1" and 9 spaces over lcd.print(millis()/1000); // display seconds elapsed since power-up lcd.setCursor(0,1); // move to the begining of the second line lcd_key = read_LCD_buttons(); // read the buttons switch (lcd_key) // depending on which button was pushed, we perform an action { case btnRIGHT: { lcd.print("RIGHT "); break; } case btnLEFT: { lcd.print("LEFT "); break; } case btnUP: { lcd.print("UP "); break; } case btnDOWN: { lcd.print("DOWN "); break; } case btnSELECT: { lcd.print("SELECT"); break; } case btnNONE: { lcd.print("NONE "); break; } } }
Example use of Enhanced LiquidCrystal_I2C library(Not updated)
This library inherits LiquidCrystal and adds another method: button – to read button pushed on a keypad. This works on the Old version of the board V1.0
/* DFRobot LCD Shield for Arduino Key Grab v0.2 Written by Glendon Klassen gjklassen@gmail.com http://www.sourceforge.net/users/ecefixer http://ecefixer.tumblr.com Displays the currently pressed key on the LCD screen. Key Codes (in left-to-right order): None - 0 Select - 1 Left - 2 Up - 3 Down - 4 Right - 5 */ #include <LiquidCrystal.h> #include <DFR_Key.h> //Pin assignments for DFRobot LCD Keypad Shield LiquidCrystal lcd(8, 9, 4, 5, 6, 7); //--------------------------------------------- DFR_Key keypad; int localKey = 0; String keyString = ""; void setup() { lcd.begin(16, 2); lcd.clear(); lcd.setCursor(0, 0); lcd.print("Key Grab v0.2"); delay(2500); /* OPTIONAL keypad.setRate(x); Sets the sample rate at once every x milliseconds. Default: 10ms */ keypad.setRate(10); } void loop() { /* keypad.getKey(); Grabs the current key. Returns a non-zero integer corresponding to the pressed key, OR Returns 0 for no keys pressed, OR Returns -1 (sample wait) when no key is available to be sampled. */ localKey = keypad.getKey(); if (localKey != SAMPLE_WAIT) { lcd.clear(); lcd.setCursor(0, 0); lcd.print("Current Key:"); lcd.setCursor(0, 1); lcd.print(localKey); } }
Old libraries for V1:
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