MPCMeter - indication of the progress of video viewing. Arduino + JavaScript

Instead of introducing

Thanks to my anonymous habradumorosis for a present ( pro mini ). Long hesitated what to do with it. He waved his hand and ordered in addition a Chinese parcel ...
After a month, it’s my time to “flash the LED”;).

Idea

While the parcel was traveling, I thought that this would be done. As a result, it was decided to do something a little more than to flash with a LED.
The idea is the following - to display the progress of viewing the video using some indicator.

Task

1. pull out statistics on the film launched;
2. process and transfer data to arduino;
3. show progress on the indicator.

For impatient immediately result

Implementation

1. MPC

How many can remember, on my PC, I always installed Media PLayer Classic . It turns out MPC is able to give statistics on, let's say, the current session in the form of an html-page with the following content:

To achieve such functionality from it, you need to put a tick " Listen to the port " in the settings

All the most important is contained in the tags

 <p id=""></p> 

It remains only to disassemble them and select the right.

2. NodeJS

We will analyze the page with the help of NodeJS. By the way, the page is available at localhost : 13580 / variables.html (port from settings).
All logic can be divided into 3 blocks:

• MPC web server module;
• data processing module;
• module working with arduino.

Further highlights. The whole project, along with the code, you can look at github

3. Arduino

Now iron. We have prepared data for arduino, now we will decide on that very indication. To display progress, I chose such a very cheap voltmeter module and tweaked it a bit


In arduino, we send data about the progress of the film and proportionally change the voltage on one of the legs of the microcontroller. Schematic diagram (the presence of the LED to blink at the end of the session;))

Now let's program our microcontroller.
In the inByte variable, we will read the data received on the com port. We hang on the 3rd pin LED, and on the 9th pin - a voltmeter. We set the exact same speed as before. loop is our endless loop. Every 100ms we send abstract data Serial.print ('A') to the port. We are waiting for the response Serial.available ()> 0. If MPC and a nodeJS application that returns progress are running on the PC, then we’ll lightly highlight the LED on the 3rd analogWrite pin (3, 5) and transmit the analogWrite progress value (9, inByte). The analogWrite function transmits values ​​from 0 to 255, which in our case corresponds to 0V to 5V. Here you need to read about PWM (PWM) - it's all thanks to him.
When we watched half of the movie, at this moment 255/2 = analogWrite (9, 127) will be transmitted to the 9th pin, which corresponds to 2.5V on the voltmeter. As soon as the film is finished - we blink vigorously with a LED;)

 int inByte = 0; void setup() { pinMode(9, OUTPUT); pinMode(3, OUTPUT); analogWrite(3, 0); analogWrite(9, 0); Serial.begin(57600); } void loop() { Serial.print('A'); delay(100); if (Serial.available() > 0) { analogWrite(3, 5); inByte = Serial.parseInt(); analogWrite(9, inByte); if (inByte==255) analogWrite(3, 255); } } 

That's how it all looks live on a breadboard

Yes, and on the video;)

By the way, this project used just a present from the very same habromedamorosis.
Ps.
Next is Attiny13, as time will be - I will try to transfer everything to it.
References:

• present from habradedamoroza ;
• Media PLayer Classic ;
• All project on github ;
• module for working with the node-serialport com port ;
• about PWM (PWM) ;
• fresh NodeJS ;
• Arduino IDE .

If somewhere you have written complete nonsense or you are mistaken - prompt, correct;). Thanks for attention.