# pitrix

## What is pitrix?

pitrix is a software to run on an ESP8266 microncontroller connected
to a LED matrix. It will display the time and a few other nice effects
and stuff.

pitrix fetches the current time via NTP, is controllable via MQTT and
can be flashed over-the-air, so you don't need to disassemble your
nice-looking LED matrix everytime you want to update the software.

### Effects


| Name | Description | Image |
| --------------- | ---------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| bell            | An example for a blinking sprite. Can be used for home automation, for example.                                                    | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/bell.gif" /> |
| big_clock       | A big clock. Seconds are moving around the edge.                                                                                   | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/big_clock.gif" /> |
| big_dynamic     | Big squares appearing in sequential colors.                                                                                        | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/big_dynamic.gif" /> |
| clock           | The small clock at the bottom. Usually used by other effects to integrate a clock.                                                 | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/clock.gif" /> |
| cycle           | Meta effect: Cycles through some of the other effects.                                                                             | - |
| confetti        | Random pixels lighting up in sequential colors and fading out again.                                                               | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/confetti.gif" /> |
| dvd             | The bouncing-around dvd logo we all know and love. High chance of hitting cordners because of the low resolution of the LED panel. | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/dvd.gif" /> |
| fire            | Fireplace-like effect. Needs more tweaking.                                                                                        | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/fire.gif" /> |
| firework        | Firework-like effect. Needs more work.                                                                                             | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/firework.gif" /> |
| gol             | Conway's Game of Life.                                                                                                             | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/gol.gif" /> |
| matrix          | That green effect from The Matrix.                                                                                                 | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/matrix.gif" /> |
| multi_dynamic   | Space is divided in 2x2 squares which are changing their color random-sequentially.                                                | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/multi_dynamic.gif" /> |
| pixel_clock     | A clock using single pixels to display the current time.                                                                           | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/pixel_clock.gif" /> |
| rainbow_matrix  | Like matrix, but not just green but displaying a rainbow across the columns.                                                       | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/rainbow_matrix.gif" /> |
| random_matrix   | Like matrix, but with random colors and random directions.                                                                         | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/random_matrix.gif" /> |
| sinematrix3     | Colorful pastel images, slowly moving about.                                                                                       | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/sinematrix3.gif" /> |
| single_dynamic  | 2x2 squares random-sequentially changing their color one after another.                                                            | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/single_dynamic.gif" /> |
| snake           | Snake. Without self-collision detection or AI.                                                                                     | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/snake.gif" /> |
| twirl           | A colorful twirl.                                                                                                                  | <img width="128" height="128" src="https://git.schle.nz/fabian/pitrix/raw/branch/master/docs/effects/twirl.gif" /> |





## How to use

Checkout the code, rename `include/config.sample.h` to `include/config.h`
and edit it to match your preferences / environment.

Then compile and flash it, preferably using PlatformIO.

## Control it

Currently, control is possible via MQTT and / or HTTP REST API.
To use MQTT, you have to define `MQTT_ENABLE` and configure your MQTT sever's credentials. MQTT_TOPIC` is set in `include/config.h` and defaults to `pitrix`.

To use the HTTP REST API, you have to define HTTP_SERVER_ENABLE and set a port number
to listen on (80 is set by default).

Possible commands / topics are:

* `MQTT_TOPIC/mode` / `POST /mode` lets you select an effect to show. See `src/effects.cpp`
  for a list. Default effect is `cycle`, which will cycle through some of
  the available effects. Another effect is `off`, which will just display
  black, effectively turning the display off. (pitrix stays running, so you
  can turn it on again by simply selecting another mode.)
* `MQTT_TOPIC/brightness` / `POST /brightness` sets the brightness of the display. Valid values
  are between 1 (darkest possible setting) and 255 (maximum brightness).
* `MQTT_TOPIC/reboot` / `POST /reboot` reboots pitrix. Send any value.

You can set retained values to have pitrix read them at startup, effectively
setting a default effect or brightness. (Do NOT set a retained value for
`MQTT_TOPIC/reboot` unless you want pitrix to reboot all the time.)

## Monitor it

The current status ("ONLINE" or "OFFLINE") of pitrix will be set at
`MQTT_TOPIC/status`.

If you enabled `MQTT_REPORT_METRICS`, metrics are sent via MQTT every 15
seconds:

* `MQTT_TOPIC/free_heap` contains the free heap memory in Bytes.
* `MQTT_TOPIC/uptime` contains the uptime of pitrix in seconds.
* `MQTT_TOPIC/fps` contains the currently reached frames per second.

If you enabled HTTP server, you can always make GET requests to `/free_heap`, `/uptime` or `/fps` to get those values.

If you enabled `DEBUG`, log messages will be sent to `MQTT_TOPIC/log`.

## Aknowledgements

### Libraries

| Library | Author | Link |
| ------- | ------ | ---- |
| PubSubClient | knolleary | https://pubsubclient.knolleary.net/
| FastLED (with small modifications) | Daniel Garcia & Mark Kriegsman | https://fastled.io
| NTPClient (with modifications) | | https://github.com/arduino-libraries/NTPClient
| ESP8266WebServer | | https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266WebServer
| ESPAsyncTCP | me-no-dev | https://github.com/me-no-dev/ESPAsyncTCP

### Inspirations and stuff
* This whole project was inspired by
  https://github.com/orithena/Arduino-LED-experiments/tree/master/Ribba16x16_v2_ESP32.
  The sinematrix3 effect was also taken from there.
* The firework effect was heavily inspired (aka copied) from
  https://gist.github.com/kriegsman/68929cbd1d6de4535b20
* The sines effect is based upon
  https://github.com/atuline/FastLED-Demos/blob/master/sinelon/sinelon.ino