The Bhack PiWall project is a 5 by 5 videowall build with Raspberry Pi.
It is based on piwall which uses a patched version of omxplayer.
This videowall will be build for and is sponsored by ICT kringloop Zwolle
Goals and tasks
A growing list of goals and tasks
- Proof, display video on a 4x4 grid and basic controller
- Controlller Webinterface for grid configuration
- Node basic grid info information (OSD)
- Frame and Vesa mounts
- Gather idea's about displaying vector images on the grid
- Figure out how to encode and stream a windows desktop to omxplayer
- Figure out how to blank and write the console tty (from python)
- Design and print VESA mount protoype
Proof, displaying video on a 4x4 grid
The first challenge is to build a working example with a 4x4 grid using desktop software and 4 raspberry pi's with http://elinux.org/Omxplayer.
Challenge almost complete and the first results are promising. Lets see how this scales.
Designing controller and node
Controller and node two way communication about grid data, start&stop and per node OSD messages.
Design choice PubSub (mqtt) and zeroconf will be used tot establish controller node communication
When a node starts it will query the controller for it's id and OSD message. If not available it will set a default OSD and then enter wait and retry.
The controller will build a list of available nodes and ask the user to order them in correspondence to their physical layout. Changed id's will be send to the nodes.
A per node OSD can be set on the controller.
TIP: This way even node spanning ascii art is possible ?
- Startup controller
- Startup Node
- Calibrate grid
- Select movie
- Play movie
- Stop movie
- Scan nodes
- Set node id
- Set node OSD message
- Get node info
- Angular / REST
- node.py (Python mqtt omxplayer wrapper)
Frame and Vesa mounts
Design choice: All displays need to be mounted on a frame together with the raspberry pi's and ethernet switch(es).
Design choice: A wireless AP will be added for streaming, uploading and control
TIP: Maybe "steigerbuis" can be used to build a super solid frame and foundation.
TIP: VESA mounts for displays and mounts for other components can be 3D printed.