Create dmx-input.md

docs/interfaces/dmx-input.md

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+---
+title: DMX Input
+hide:
+  # - navigation
+  # - toc
+---
+
+### DMX Input
+
+!!! info "Version Info"
+    As of version v0.14.0-b25 MM-WLED supports DMX input via MAX485. This is great when ArtNet or e1.31/sACN over WIFI is not suitable 
+
+#### features and limitations
+
+* one universe (512 channels)
+
+#### software setup
+
+For the DMX feature to work, you'll need to use the V4 build varients.
+
+#### hardware setup
+
+The DMX output required the use of a MAX485 transceiver connected to the pins defined in setup of the ESP in order to produce DMX input.
+
+For information about the use of DMX with ESP8266, you might like to read [this](https://robertoostenveld.nl/art-net-to-dmx512-with-esp8266/) tutorial by [Robert Oostenveld](https://robertoostenveld.nl/). Note this is just background information about the hardware and you do not need any of the code listed here when using WLED output.
+
+#### questions
+
+If you have further questions about this feature, you can reach me via github (@netmindz) or via WLED Discord (netmindz).