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