Hi all
I have a comms board for DMX that uses a Max481/485 for the comms between the Arduino and the DMX light fixtures. All works fine.
I have a wireless DMX light and it would be nice to be able to talk wirelessly to that fitting.
Is it a simple (within reason) case of finding an RS-485 transmitter and using that instead?
Not that I have found one yet. Ideally, I would find the component/IC and design it into my next PCB.
Anyone know of a wireless RS-485 IC? Drawn a blank so far...
Thanks
RS-485 is a hard-wired connection.
I don't know anything about wireless DMX. I don't know if it's a "standard". Can you buy a wireless DMX light? (That would have to meet some standard.) Or do they always need an adapter where the transmitter & receiver are mated together and come from the same company?
But you can plug wireless DMX transmitters/receivers into your Arduino RS-485 board.
Or "theoretically" you could build your own wireless transmitters/receivers (to any standard that can transmit data) and you wouldn't need RS-485 on the Arduino-end. You'd only need RS-485 for the lights or other DMX equipment with the standard connections.
No such IC exists.
You can build your own DMX device based on an Arduino (ESP...) with wireless capabilities (BT, WiFi...) and a DMX module. Then you can use a master Arduino to talk wireless to that slave Arduino.
I was looking for the base circuitry for the transmission part of the RS-485.
My home-made PCB has optically isolated RX and TX DMX through a male and female XLR socket.
I can plug-in an 'off the shelf' DMX transmitter module and that converts the wired DMX signal to wireless. That is then received by my wireless DMX light.
Seeing as I am designing a new DMX pcb, I thought it would have been nice to include the transmitter circuitry on the new PCB and remove the unsightly huge DMX transmitter.
The DMX signal itself must be industry standard, as these wireless transmitter 'converters' seem to work with all wireless DMX devices. It must be simply converting the RS-485 signal somehow.
Maybe I will buy a cheap DMX TX module and open it up for a browse
My new PCB design will be based around an ESP32s.
You don't seem to be considering that RS-485 is a CONTINUOUS voltage of one polarity or the opposite. There is NEVER any point where there is NOT one voltage or the other. How do you resolve that with some wireless protocol that is message based?
I have no idea. I need to identify how the wireless system I have (plug in) works.
I am going to strip down the transmitter and see what it's made of. I have no doubt it's not something I can copy.
RS485 was designed to convey serial data from one device to another by wires, more reliably than RS232, as well as to allow multidrop networking.
Any other means of conveying those same serial data, including wireless, will work. That would include using an RS-485 to TTL serial adapter to drive a TTL to wireless serial adapter.
Wireless adapters usually require a special network protocol.
Not the wireless UART serial adapters I'm thinking of.
But the OP appears to have no knowledge of the wireless protocol used by the DMX light, so any further discussion is probably a waste of time until that is resolved.
The term "wireless RS485" makes no sense, physically.
It ahese TX/RX pairs are on 2.4Ghz. I image they convert to their own comms protocol and then convert the data back.
The ones I have here are re-chargeable and have an internal battery
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