Python script that captures data from serial port, coming from Arduino Nano and re-exports its as Prometheus metrics

by josevnz 2 years ago

GNU/Linux ◆ xterm-256color ◆ bash 912 views

This is for my YAFD (Yet Another Food Dispenser) project:

(YetAnotherFoodDispenser) [josevnz@dmaf5 YetAnotherFoodDispenser]$ scripts/prometheus_yafd_exporter.py –help usage: Script to expose Arduino serial port readings using Prometheus client code. Author: Jose Vicente Nunez (kodegeek.com@protonmail.com)

   [-h] [--serial_port SERIAL_PORT] [--baud BAUD] [--prom_port PROM_PORT] [--verbose]

optional arguments: -h, –help show this help message and exit –serial_port SERIAL_PORT

                    Serial port name /dev/ttyUSB0

–baud BAUD Serial port speed 9600 –prom_port PROM_PORT

                    Prometheus 8000

–verbose Print captured reading to screen

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You can download this recording in asciicast v2 format, as a .cast file.

Download

Replay in terminal

You can replay the downloaded recording in your terminal using the asciinema play command:

asciinema play 534507.cast

If you don't have asciinema CLI installed then see installation instructions.

Use with stand-alone player on your website

Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/534507.cast',
      document.getElementById('player'),
      { cols: 181, rows: 24 }
    );
  </script>
</body>
</html>

See asciinema player quick-start guide for full usage instructions.

While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/534507 demo.gif

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.