Lola Feeder Script

lola_feeder.js

const RaspiCam = require('raspicam');
const axios = require('axios');
const schedule = require('node-schedule');
const fs = require('fs');
const moment = require('moment');
const rfDevice = require('./RF_Thing');
const tweeter = require('./tweets');

// Set times to turn lamp on and off
const LAMP_ON_CRONTAB = "0 5,20 * * *";
const LAMP_OFF_CRONTAB = "0 8,23 * * *";

// Use 'node-schedule' library to turn lamp ON at specified times.
let lampOn = schedule.scheduleJob(LAMP_ON_CRONTAB, function() {
	rfDevice.rfCommand(rfDevice.LAMP, 'on');
});

// Use 'node-schedule' library to turn lamp OFF at specified times.
let lampOff = schedule.scheduleJob(LAMP_OFF_CRONTAB, function() {
	rfDevice.rfCommand(rfDevice.LAMP, 'off');	
});

// Instantiate a Raspberry Pi camera lib instance
const cam = RaspiCam({
	mode: 'photo',
	output: 'rpicam.jpg',
	width: 600,
	height: 600,
	quality: 80,
	timeout: 2000
});

// Log when a photo is taken
cam.on('start', function(err, ts) {

  console.log('Photo snapped at ' + ts);

});


// When a photo capture is complete...
cam.on('stop', function(err, ts) {

  if (err) {
		console.log(err);
		return;
	}

  // Send a GET request to the Lola_Detector.py service  
	axios.get('http://127.0.0.1:5000/lola')
		.then(function(response){

			let data = response.data;
      
      // Check the lola probability in the result.
			if ( response.data.lola > 0.993 ) {

				console.log('Lola FOUND!! Activating Feeder.')
				
        // Turn ON the Feeder
				rfDevice.rfCommand(rfDevice.FEEDER, 'on');

        // Send a request to IFTTT Maker rule that sends me a push notification
				axios.get('https://maker.ifttt.com/trigger/lola_feeder_triggered/with/key/<mysecrectkey>');

				let now = moment().format('YYYY-MM-DD_HHmm');

        // Copy the image to a separate folder for archival purposes.
				fs.createReadStream('rpicam.jpg').pipe(fs.createWriteStream(`./snaps/${now}.jpg`));
				
        // Wait 60 seconds to do more stuff.
				setTimeout(function() {

          // Tweet the picture
					tweeter('./rpicam.jpg');
					
					console.log('Turning off Feeder.')
					
          // Turn off the Feeder
					rfDevice.rfCommand(rfDevice.FEEDER, 'off');

          // Set the wait time to 1.5 hours.
					let hours = 1000 * 60 * 60 * 1.5;
					
          // Prepare the whole thing to start over in 1.5 hours.
					camRestart(hours);

				}, 60000);
				
			} else {
			
				console.log(' No Lola ');

        // If no lola, wait a couple seconds and try again.
				camRestart(2000);

        // TODO: instead of constantly snapping photos every 2 seconds, use a PIR motion sensor to kick of a photo snapping session.
			}

		})
		.catch(function(err){
    
			console.log(err.message);
		
    });
	
});

// Stop the camera
cam.on('exit', function(ts) {
  
	cam.stop();	

});

// This function kicks off the photo snap & analyze cycle after <timeout> ms
function camRestart(timeout) {
  
	console.log('camRestart. Timeout: ' + timeout/1000 + ' seconds.');

	setTimeout( function() {
    
		cam.start();

  }, timeout)
  
}

// Start the app when the script loads for the first time.
camRestart(1000);