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notify.js
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notify.js
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'use strict'
var series = require('async/series')
var tessel = require('tessel')
var gpio = tessel.port['GPIO']
var FREQUENCY = 500
var CYCLE = 0.7
module.exports = notify
function notify (speaker) {
series([
beep(70),
wait(60),
beep(70),
wait(60),
beep(70),
wait(120),
beep(180),
wait(60),
beep(180),
wait(60),
beep(180),
wait(120),
beep(70),
wait(60),
beep(70),
wait(60),
beep(70)
])
function beep (delay) {
return function (cb) {
gpio.pwmFrequency(FREQUENCY)
speaker.pwmDutyCycle(CYCLE)
setTimeout(function () {
speaker.pwmDutyCycle(0)
cb()
}, delay)
}
}
function wait (delay) {
return function (cb) {
setTimeout(cb, delay)
}
}
}