| Pin | Function |
|---|---|
| Analog 0 | Button (select, up, right, down and left) |
| Digital 4 | DB4 |
| Digital 5 | DB5 |
| Digital 6 | DB6 |
| Digital 7 | DB7 |
| Digital 8 | RS (Data or Signal Display Selection) |
| Digital 9 | Enable |
| Digital 10 | Backlit Control |
Example Code
//Sample using LiquidCrystal library #include <LiquidCrystal.h>/******************************************************* This program will test the LCD panel and the buttons Mark Bramwell, July 2010 Josep Crehuet, 20.01.2015 ********************************************************/ // 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 // Serial.println(adc_key_in); // See the button values // if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result // if (adc_key_in < 50) return btnRIGHT; if (adc_key_in < 150) return btnUP; if (adc_key_in < 350) return btnDOWN; if (adc_key_in < 550) return btnLEFT; if (adc_key_in < 750) return btnSELECT; return btnNONE; // when all others fail, return this... } void setup() { Serial.begin(9600); lcd.begin(16, 2); // start the library lcd.setCursor(0,0); lcd.print("Push any button"); // 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; } } }
