xyeShelf

A MQTT controlled, FastLED powered Arduino sketch to animate each pocket of a shelf, having multiple WS2812B's. There are multiple animations that can be run:

• sparkling fire animation, inspired by NeoFire.
• blue wave Pacifica animation, inspired by this FastLED example.
• glowing ball, expanding and collapsing periodically.
• growing tree animation.
• a game of pong, where the players are blue, the ball white. When a player hits the ball they light up green. When a player misses, the hemispheres light up green and red to indicate the player that lost or won.
• colorful disco animation, where the beats per minute can be controlled via the parameter.
• two white dots, flowing in circles.

MQTT Control

The xyeShelf_mqtt.py starts a server, through which you an control the xyeShelf. The following MQTT topics are relevant:

• /xyeShelf/reboot to publish a 1 to, to reboot the arduino board.
• /xyeShelf/animation_requested to publish a integer number to, to choose an animation.
• /xyeShelf/parameter_requested to publish a integer number (0 to 255) to, to control a certain aspect of the animation.

	Animation	Parameter
0	fire	Control the liveliness of the animation. The +‰-value indicates, how the mixing ratio of two key frames is increased with each loop. When the ratio is at 100%, the next key frame is calculated.
1	pacifica	no effect
2	ball	no effect
3	tree	no effect
4	pong	At 128, the game is balanced for a tie between the players, so both miss the ball equally often. At 0 or 255, one player never misses, the other double as much, compared to balance.
5	disco	Control the beats per minute (bpm), as p/2=bpm. So when p=255, the bpm is 128.
6	flow	no effect

Further, other mqtt clients can subscribe to the following topics to see, what is going on on the board:

• /xyeShelf/animation_actual to subscribe to, to see the result of requesting an animation.
• /xyeShelf/parameter_actual to subscribe to, to see the result of requesting a parameter.

Both actual topics will contain a json response in the following form:

   {
     "state": "<as accepted by sketch or negative for errors>",
     "description": "<textual description for the state>"
   }

The script needs to be run on the device, that the arduino is connected to via USB. Please adjust the server in the python script to your needs.

Further Reading

• xyeShelf sketch