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doc: add intended use

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King Kévin 2023-09-30 04:26:18 +02:00
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README.md
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@ -126,10 +126,41 @@ Thus interface with is will be very easy and there is a lot of software support.
The limitation is that it supports only one universe of 512 channels, or 170 RGB LEDs.
A solution would be to control modes instead of individual LEDs.
intended use case
-----------------
The purpose is to provide a simple board able to control LEDs strips.
It should be better than general purpose development boards.
A built-in voltage converter allows driving an LED strip.
It is intended for small installations, not requiring more than 5 meters of LED strings.
This keeps the power supply small.
The board is not intended for large LED installation requiring a lot of power.
The board should be cheap enough to be a default choice when creating a small LED installation.
the goal is at 5 to 10€ per board.
This prevents me for using Ethernet, since the PHY and magnetics are expensive (~ 3€).
It should not require a complex installation.
Something like a LAN requiring a permanent switch or router is already too much.
The board should be able to work on its own.
It should be make it easy to create multi-device installations.
This is provided by the chaining capability.
You can connect one device to another, and the job is done.
This single link provides power.
This allows using a single power supply for the whole installation, just connected to the first device in the chain.
It should use cheap and common cable for the chain link, such as Ethernet cables.
It should accept common off the shelves power supplies, such as 12-24V 2-4A bricks.
The chain link should also allow synchronising the devices.
Ideally it should also provide an interface to reliably remotely control them.
Thus the DMX512 protocol.
features
--------
Here a wish list of features I began with, in decreasing order:
Here a wish list of features I began with, in decreasing order of importance:
- daisy chain capability (providing data and power)
- built-in power 5V power supply (input up to 30V)