touchkey v1.0.1

Touch Key

NodeJS Touch Keypad lib for QT1070.

Turns the QT1070 into a small keypad with key events.

Just subscribe to any of the events:

• keydown: to get notified when a key is pressed
• keyup: to get notified when a key is released
• keychange: to get notified when a key is pressed or released

The event object contains both the key (0 to 6) and state ('pressed' or 'released'). For example:

{
  key: 1,
  state: 'pressed'
}

You can also read the current state of the keys using the method key_states() which returns an array of all keys in the format shown above.

Dependencies

This library makes use of:

• qt1070 a driver library to interact with the QT1070
• i2c-bus to communicate with i2c devices
• onoff to detect the interrupts coming from the QT1070 chip

Example

The i2c object needs to be injected via the constructor.

A basic example:

const TouchKey = require('touchkey');
const i2c = require('i2c-bus');

const i2c1 = i2c.open(1, (err) => {
  if (err) throw err;
  console.log("Opened i2c bus successfully");

  let keypad = new TouchKey(i2c1);

  keypad.on('keychange', (event) => {
    console.log("Getting keychange event " + JSON.stringify(event));
  });

  keypad.on('keydown', (event) => {
    console.log("Getting keydown event " + JSON.stringify(event));
  });

  keypad.on('keyup', (event) => {
    console.log("Getting keyup event " + JSON.stringify(event));
  });

});