https://github.com/mcollina/tessel-pulse

Pulse your LEDs with tessel
https://github.com/mcollina/tessel-pulse

Last synced: 13 days ago
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Pulse your LEDs with tessel

• Host: GitHub
• URL: https://github.com/mcollina/tessel-pulse
• Owner: mcollina
• License: isc
• Created: 2014-11-20T10:48:07.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2014-11-20T14:09:45.000Z (about 10 years ago)
• Last Synced: 2024-12-17T15:42:34.763Z (23 days ago)
• Language: JavaScript
• Size: 129 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
tessel-pulse

============

Pulse your LEDs with tessel. This module works only on [PWM

pins](https://tessel.io/docs/hardwareAPI#pins)

Example

-------

```js

var tessel = require('tessel');

var mqtt = require('mqtt');

var port = tessel.port['GPIO'];

var pulse = require('tessel-pulse');

var pin = port.pwm[0]; // G4

var stop = pulse(pin, {

  type: 'pulse', // or 'blink'

  steps: 200, // the number of increments of the intesity of the led's light

  changeFrequency: 500 // ms after the step is incremented/decremented

});

setTimeout(stop, 10000); // blink for 10s

```

Example with MQTT

-----------------

First, install [MQTT.js](http://npm.im/mqtt) with:

```bash

npm install mqtt --save

```

Then:

```js

var tessel = require('tessel');

var mqtt = require('mqtt');

var port = tessel.port['GPIO'];

var pulse = require('tessel-pulse');

var pin = port.pwm[0]; // G4

var stop = null;

var client = mqtt.connect('mqtt://test.mosca.io');

port.pwmFrequency(10000) // set the PWM frequncy to 10kHz

client.publish('leds/matteo/hello', 'I\'m online!')

client.subscribe('leds/matteo/+')

client.on('message', function(topic, payload) {

  var command = topic.replace('leds/matteo/', '');

  console.log(payload)

  if (!payload)

    payload = {}

  else

    try {

      payload = JSON.parse(payload)

    } catch(err) {

      console.log('wrong json', err)

    }

  if (stop) stop()

  switch(command) {

    case 'start':

      stop = pulse(pin, payload)

      console.log('pulser started');

      break;

    case 'stop':

      console.log('pulser stopped');

      stop = null

      break;

  }

})

console.log('hello from my led!')

```

License

-------

ISC