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- /* The LCD circuit:
- * LCD pin 1 to ground
- * LCD pin 2 to 5V
- * LCD RS pin 4 to digital pin 12
- * LCD R/W pin 5 to ground
- * LCD Enable pin 6 to digital pin 11
- * LCD D4 pin 11 to digital pin 5
- * LCD D5 pin 12 to digital pin 4
- * LCD D6 pin 13 to digital pin 3
- * LCD D7 pin 14 to digital pin 2
- * LCD pin 15 to 5v with 220ohm resistor
- * LCD pin 16 to ground
- *
- * 10K pot:
- * one end to +5V and the other to ground
- * wiper (middle pin) to LCD pin 3
- */
- // include the library code:
- #include <LiquidCrystal.h>
- // include the keypad code:
- #include <Keypad.h>
- const byte ROWS = 4; //four rows
- const byte COLS = 3; //three columns
- char keys[ROWS][COLS] = {
- {'1','2','3'},
- {'4','5','6'},
- {'7','8','9'},
- {'*','0','#'}
- };
- // keypad1 > pin13
- // keypad2 > pin10
- // keypad3 > pin9
- // keypad4 > pin8
- // keypad5 > pin7
- // keypad6 > pin6
- // keypad7 > pin0
- byte rowPins[ROWS] = {10, 0, 6, 8}; //connect to the row pinouts of the keypad
- byte colPins[COLS] = {9, 13, 7}; //connect to the column pinouts of the keypad
- Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
- // initialize the library with the numbers of the interface pins
- LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
- void setup() {
- // set up the LCD's number of columns and rows:
- lcd.begin(16, 2);
- // Print a message to the LCD.
- lcd.print("Enter code:");
- }
- void loop() {
- // set the cursor to column 0, line 1
- // line 0 is the first row, line 1 is the second row
- lcd.setCursor(0, 1);
- char key = keypad.getKey();
- if (key != NO_KEY){
- lcd.print(key); // print keypress to LCD
- }
- }
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