How to code a 4x4 keypad module similar to how t9 keyboard works, those old phone keypads
This is for a project and i already found a code that can output the inputs from the keypad to the lcd and i figured that i could modify it but i'm not really a coder and i'm not sure what to add but the general idea is that it works similarly to those keypads on old phones
this is the code:
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#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int i=0;
const char number_of_rows = 4;
const char number_of_columns = 4;
char row_pins[number_of_rows] = {2, 3, 4, 5};
char column_pins[number_of_columns] = {6, 7, 8, 9};
char key_array[number_of_rows][number_of_columns] = {
{'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; Keypad k = Keypad(makeKeymap(key_array),row_pins , column_pins, number_of_rows, number_of_columns); void setup() { Serial.begin(9600); lcd.begin(16,2);
lcd.backlight(); lcd.setBacklight(HIGH); } void loop() { char key_pressed = k.getKey(); if(key_pressed) { Serial.println(key_pressed); lcd.setCursor(i,0); lcd.print(key_pressed); i=i+1; } } kinda desperate
{'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; Keypad k = Keypad(makeKeymap(key_array),row_pins , column_pins, number_of_rows, number_of_columns); void setup() { Serial.begin(9600); lcd.begin(16,2);
lcd.backlight(); lcd.setBacklight(HIGH); } void loop() { char key_pressed = k.getKey(); if(key_pressed) { Serial.println(key_pressed); lcd.setCursor(i,0); lcd.print(key_pressed); i=i+1; } } kinda desperate
1 Reply
the code seems to work, what is your question?