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Add R0 notice to README.md

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@ -12,6 +12,8 @@ All print files (STL, STEP, X_T) can be found in [assets/case](/assets/case/). A
![Circuit diagram](/assets/circuit/diagram.svg) ![Circuit diagram](/assets/circuit/diagram.svg)
You have to short-circuit R0 on the RS485 boards to enable the termination resistor required for DMX before the first and after the last device in line.
## Pin usage ## Pin usage
| GPIO | Usage | | GPIO | Usage |