48 lines
2.3 KiB
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48 lines
2.3 KiB
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================
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Tallies Overview
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================
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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:
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.. drawio-image:: overview.drawio
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Hardware
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========
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The hardware for the tallies is an ``esp8266`` microcontroller, as they can be found `on Amazon <https://www.amazon.nl/Diymore-ESP8266-WiFi-ontwikkelingskaart-NodeMCU-ESP-12E-module/dp/B09Z6T2XS4/ref=sr_1_2_sspa?__mk_nl_NL=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=3DHTKU7SQKET9&keywords=esp8266&qid=1674509572&sprefix=esp8266%2Caps%2C135&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1>`_.
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These microcontrollers are very cheap but are capable of using the ``802.11 b/g/n`` wifi standard(``IEEE``).
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A quick overview of the hardware:
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+-------------------------+--------------------------------------+
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| Type | Value |
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+=========================+======================================+
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| CPU | 32Bit RISC based on ``Xtensa lx106`` |
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+-------------------------+--------------------------------------+
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| Instruction RAM | 32 KiB |
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+-------------------------+--------------------------------------+
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| Instruction Cache | 32 KiB |
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+-------------------------+--------------------------------------+
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| User Data RAM | 80 KiB |
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+-------------------------+--------------------------------------+
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| System Data RAM | 16 KiB |
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+-------------------------+--------------------------------------+
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| Flash Memory (External) | 4 MiB |
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+-------------------------+--------------------------------------+
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Of the 17 GPIO pins available, only 3 are used for the RGB colouring.
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Wifi is used for communication between the tallies and a server that will tell the tally to turn on the lights.
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Software
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========
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On the Host a ``NodeJS`` server is run that opens a websocket on port ``7411``.
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This websockets waits for tallies to connect and sends data to them when connected.
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The server also connects to the streamer, in our case a ``Black Magic ATEM`` that controls the camera's.
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The streamer gives information about which camera is active which is passed to the tallies.
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