![]() ![]() ![]() If there’s a defective device and you have such a ground loop, you can damage all the equipment, including the computer. Two unwanted issues here: this allows for ground loops to exist, so a current path can be established from a DMX slave device through the RS485 transceiver and then through Arduino and the USB cable connected to a computer or a laptop. This is a non-isolated DMX transceiver, so there is no galvanic isolation between the master device and the rest of DMX devices. ![]() The RS-485 click board features a half-duplex SN75176 IC (which is basically an MAX485 clone). The number of DMX channels is up to 512, but due to memory space restrictions you may wish to use a limited set of channels. This project allows up to 32 devices to be connected to the same DMX bus, including the master controller, so up to 31 slave devices can be used. In this project, I will show how to implement a DMX master controller using one Arduino Uno, and one MikroElektronika Uno Click shield hosting one RS-485 click board.
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