rpi-keypad

a simple matrix keypad library for the raspberry pi

installation

npm i rpi-keypad

sample usage

typescript usage

import Keypad from "rpi-keypad";
...

javascript usage

var Keypad = require("rpi-keypad");

var input = new Keypad(
    [
        ["1", "2", "3", "A"],
        ["4", "5", "6", "B"],
        ["7", "8", "9", "C"],
        ["*", "0", "#", "D"],
    ],                  // keypad layout
    [40, 38, 36, 32],   // row GPIO pins
    [37, 35, 33, 31],   // colum GPIO pins
    // additional:
    true,               // use key press events
    100                 // interval in ms to poll for key events
);
    
// using own polling
setInterval(() => {
    var key = keypad.getKey();
    if (key != null){
        console.log("key pressed: " + key);
    } else {
        console.log("no key pressed");
    }
}, 100);

// using events
keypad.on("keypress", (key) => {
    console.log("key pressed: " + key);
})