hestia/main.js

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// npm module for Raspberri Pi GPIO
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var gpio = require('rpi-gpio');
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// Module for importing environment variables
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var dotenv = require('dotenv').config();
// Module for working with files
var fs = require('fs');
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// Write the current env vars to console
console.log('Environment variables:');
console.log(`ONTIME=${process.env.ONTIME}\nOFFTIME=${process.env.OFFTIME}\nPAUSETIME=${process.env.PAUSETIME}\nDEBUG=${process.env.DEBUG}`);
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// Set up GPIO 4 (pysical pin 7) as output, then call cycleAuger()
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gpio.setup(7, gpio.DIR_OUT, cycleAuger);
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// TODO Move functions to another file for cleaner code
// TODO Add logic for other sensors
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// Turns the auger on (Pin 7 high)
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function augerOn(err) {
if (err) throw err;
gpio.write(7, true, function(err) {
if (err) throw err;
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if (process.env.DEBUG == "true") console.log('Auger turned on.');
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});
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}
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// Turns the auger off (pin 7 low)
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function augerOff(err) {
if (err) throw err;
gpio.write(7, false, function(err) {
if (err) throw err;
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if (process.env.DEBUG == "true") console.log('Auger turned off.');
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});
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}
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// Sleeps for any given milliseconds, call with await
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function sleep(ms) {
return new Promise((resolve) => {
setTimeout(resolve, ms);
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if (process.env.DEBUG == "true") console.log(`Slept for ${ms}ms`);
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});
}
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// Main function, turns the auger on, sleeps for the time given in environment variables, then turns the auger off, sleeps, repeats.
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async function cycleAuger(err) {
if (err) throw err;
// Check for pause file existing, then sleep for preset time, then run the function again.
if (fs.existsSync('./pause')) {
console.log('Paused...');
await sleep(process.env.PAUSETIME);
cycleAuger();
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return;
}
// Check for reload file existing, then reload environment variables, then delete the file.
if (fs.existsSync('./reload')) {
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var dotenv = require('dotenv');
dotenv.config({ override: true })
fs.unlink('./reload', (err) => {
if (err) throw err;
console.log('Deleted reload file.');
});
console.log('Reloaded environment variables.');
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console.log(`ONTIME=${process.env.ONTIME}\nOFFTIME=${process.env.OFFTIME}\nPAUSETIME=${process.env.PAUSETIME}\nDEBUG=${process.env.DEBUG}`);
}
// Check for quit file existing, then delete it, then quit the program
if (fs.existsSync('./quit')) {
fs.unlink('./quit', (err) => {
if (err) throw err;
console.log('Removed quit file.');
});
console.log('Quitting.');
process.exit();
}
// If none of the above checks are true, cycle the auger on and off, then repeat
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augerOn();
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await sleep(process.env.ONTIME);
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augerOff();
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await sleep(process.env.OFFTIME);
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cycleAuger();
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}