Tallies Overview
This page gives a short overview of how the tallies work in relation to the camera’s. A simple overview of the tallies in correlation between the server and the streamer is shown below:
Hardware
The hardware for the tallies is an esp8266 microcontroller, as they can be found on Amazon.
These microcontrollers are very cheap but are capable of using the 802.11 b/g/n wifi standard(IEEE).
A quick overview of the hardware:
Type |
Value |
|---|---|
CPU |
32Bit RISC based on |
Instruction RAM |
32 KiB |
Instruction Cache |
32 KiB |
User Data RAM |
80 KiB |
System Data RAM |
16 KiB |
Flash Memory (External) |
4 MiB |
Of the 17 GPIO pins available, only 3 are used for the RGB colouring. Wifi is used for communication between the tallies and a server that will tell the tally to turn on the lights.
Software
On the Host a NodeJS server is run that opens a websocket on port 7411.
This websockets waits for tallies to connect and sends data to them when connected.
The server also connects to the streamer, in our case a Black Magic ATEM that controls the camera’s.
The streamer gives information about which camera is active which is passed to the tallies.