Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [dmx]

16 questions
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UART Synchronization After Break

With the assumption that not all UART are create equal and that documentation in general is not sufficient to answer this question, I have to ask how can I tell which UARTs (or generally asynchronous serial receivers) properly handle the Break…
bscloutier
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1 answer

How can I reuse a crowdled bracelet?

I have been to an event last night, where I some wristbands produced by the Crowdled company (see links at the end). Material of one band: 3 colored leds (2 in total) and a button. Runs on battery. For the pictures I opened the bands (2 screws). In…
Daniel Herold
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Infineon DAVE v4.2.2. XMC1200 Boot Kit 4-Channel DMX Issue

I am using Infineon Dave v4.2.2. to program the XMC1200 boot kit with colour LED card to read a DMX input signal using a rotary dial. For those that don' know, Dave uses a simple UI with "apps" that will auto-generate code for you. I have…
Euan Clapworthy
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1 answer

How to make a circuit for DMX splitter notification LEDs?

I am trying to make a DMX splitter. Everything works now, but it would be somewhat useful to have notification LEDs, like in the example below. For the input I could use one LED, which I either connect to the RS485 + or -. Which one does not…
Michel Keijzers
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MAX487CPA/SN75176BP RS485 IC gets too warm (in DMX Splitter circuit)

Brief I built part of the scheme below (input K2/IC5, optocoupler IC9 and output IC6/K3). IC9 is overheating when I connect LED pars to K3, because voltage is flowing back into pin 6/7. If I connect pin 6 OR 7 all is ok, when I connect both, after a…
Michel Keijzers
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Problem with chaining many small DMX cables

In DMX cables (used for lights), all cables are daisy-chained. In my band we are normally on small stages, but occasionally on bigger. To prevent buying very long cables, I wonder if it is a good idea to buy multiple 5 m (or yard) cables and just…
Michel Keijzers
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MAX485 DMX connection polarity/pinout

Im working on an Arduino project that involves receiving DMX with a MAX485 chip. The pinout of the chip has the 2 dmx pins labeled as A and B, but all the DMX pinouts have them labeled as + and -. What connects to what? Looking around, I have seen…
Randomaker
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Wireless Artnet Node

I wanted to ask for help in researching appropriate Microcontrollers to create a Wireless Artnet/sACN Node for DMX communications with film and stage lighting Fixtures. The ultimate goal for the system is to have a mesh network of Nodes that are…
Connor N
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TVS diode identification

I'm trying to ID diodes on a board - the markings on the diodes are "BK 9EJ3D". I understand this is a TVS diode and it's being used to clamp RS485 differential pair to ground with a termination circuit into a MAX 485 driver (485 to ttl). They…
matt
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Isolating DC from DMX signal

I have a DMX controller using a 3-pin connector (gnd, data+ and data-). I need to connect it to some cheap chinese DMX lights. The problem is that the lights are powered over the same 3 lines using a 24 VDC power supply. When I did, it burned out my…
illu
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AVR DMX Transmitter outputs constant squarewave, not the form of a DMX packet

I'm using an ATMEGA328, with an external 20MHz crystal and fuses set by avrdude as -U lfuse:w:0x46:m -U hfuse:w:0xdf:m. I want to send DMX with it. Using the code from Radig…
Rando Hinn
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DMX Control - 50W COB LED

I have a DIY project, with the aim of building an (LED-based) stage/theatre light from scratch. One of the challenges I've hit with this is getting DMX control to dim the LED. I spent some time looking for an 'out of the box' solution, but to no…
BaseThree
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DMX receiver 40V signal

I am creating a DMX receiver circuit. The dmx that is received from a controller (USB DMX dongle) is converted via a transceiver (SN75176BP) to a signal which can be understood by an ATMEGA328P. I now have the problem that it is not recognized.…
Arthur Timmermans
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DMX chassis(?) pin?

I want to recreate this circuit (only show a small relevant portion): And my XLR plug for input (K2) looks like this: I found a reference how to connect K2, +, - and GND to the correct pins of the XLR plug, but what about the 4th pin (with the…
Michel Keijzers
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12V DC DMX LED Controller needs to be reduced to 5V

I need a bit of help for a lighting project I am undertaking. I have a couple of 12 volt DMX LED controllers driving various zones in a bathroom with LED strip. I want to replace the controlbox for the LEDs in the bath and drive it via my DMX…
Olly Thomas
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