Rotary Encoder

Kaluma library for rotary encoder with a push switch (KY-040)

Wiring

Here is a wiring example.

Raspberry Pi Pico	Rotary Encoder
3V3	+
GND	GND
GP0	CLK
GP1	DT
GP2	SW

Install

npm install https://github.com/niklauslee/rotary-encoder

Usage

const {RotaryEncoder} = require('rotary-encoder');

const clkPin = 0;
const dtPin = 1;
const swPin = 2;

pinMode(clkPin, INPUT); // external pull-up.
pinMode(dtPin, INPUT); // external pull-up.
pinMode(swPin, INPUT_PULLUP); // interal pull-up.

const encoder = new RotaryEncoder(clkPin, dtPin, swPin);

encoder.on('rotate', (value) => {
  console.log(value);
});

encoder.on('click', () => {
  console.log('click');
});

API

Class: RotaryEncoder

A class encapulating a rotary encoder.

new RotaryEncoder(clkPin, dtPin[, swPin])

Create an instance of RotaryEncoder class. You have to set pin mode before creating an instance.

• clkPin <number> Pin number of CLK.
• dtPin <number> Pin number of DT.
• swPin <number> Pin number of SW (switch).

encoder.close()

Close the rotary encoder. It closes all watchers and timer for detecting signal changes of the encoder.

Event: 'rotate'

• value 1 when rotates clockwise, -1 when rotates anti-clockwise.

Emitted when the rotary encoder rotates.

Event: 'click'

Emitted when the switch is pressed.