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heartbeat2.js
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heartbeat2.js
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'use strict';
/* Exploration to use a sensor object for heartbeat processing. Works when the
* sensor uses an analog pin, but that is a scarce resource. Trying to get to
* work using a digital pin.
*
* The documentation https://github.com/rwaldron/johnny-five/wiki/Sensor for a
* Sensor (object) says the pin can be "Any pin on board", and the sample values
* include (apparently) digital pin numbers, but?
*/
var five = require('johnny-five');
var myBoard = new five.Board();
var heartConfig = {
id: 'Sensor Heartbeat',
// pin: 'A5',
// type: 'analog',
// range: [0, 1023],
pin: 8,
type: 'digital',
range: [0, 1],
freq: 9000 //milliseconds (9 seconds)
};
/***
* Handle heartbeat processing, when a new (timed) value is read from the sensor
*
* @param {Object} err error object
* @param {integer} val The just read sensor value
* @return {undefined}
*/
function heartData(err, val) {
/* jshint validthis:true */
console.log('heartData start');//trace
// console.log('data:', this);//The sensor instance
console.log('err', err);//null//DEBUG
console.log('val', val);//259//DEBUG
console.log('heartData end');//trace
}
/**
* The code for the project, that will be run when the board is ready
*
* This is a 'callback' function that will be run by johnny-five after it has
* finished all the behind the scenes setup.
*
* johnny-five makes the board that this is a callback for available in the
* 'this' parameter / variable. All methods / properties of the specific
* board are available as properties of 'this'.
*/
function boardIsReady() {
/* jshint validthis:true */
var hSensor = new five.Sensor(heartConfig);
console.log('Sensor:', hSensor);
hSensor.on('data', heartData);
console.log('data callback configured');
this.repl.inject({
heart: hSensor
});
console.log('heart injected to repl');
// process.exit();
}// ./function boardIsReady()
// This is where the program actully starts running. It is kept at the end,
// after the callback function boardIsReady has been created, so that the
// jslint program does not complain about using something before it was defined.
// The way javascript works, it is not a technical requirement. Just good
// practice.
myBoard.on('ready', boardIsReady);