[Noisebridge-discuss] arduino dmx receiver

robb sf99er at gmail.com
Tue May 24 04:22:30 UTC 2016


wow
nice timing
i just sat down from running an audio snake & dmx line from the omni stage
to the rear mezzanine along the rafters.
got all our working pars hung too
nothin left to do but make lights
:))


On Mon, May 23, 2016 at 8:07 PM, Robert "Finny" Merrill <
rfmerrill at berkeley.edu> wrote:

> If you want to receive DMX it's pretty easy--it's just 250 kbps
> serial, 8 data bits, 1 stop bit, no parity.
>
> You detect the beginning of a DMX frame by looking for a break
> condition (on an AVR this shows up as the "frame error" bit being set
> in the UART status), then you just read bytes and throw them out until
> you get to the one corresponding to an address you're listening to.
>
> On Mon, May 23, 2016 at 8:04 PM, Robert "Finny" Merrill
> <rfmerrill at berkeley.edu> wrote:
> > If you want one written in raw C (not arduino) I rolled my own a while
> > ago: https://github.com/rfmerrill/venusdmx/blob/master/venusdmx.c
> >
> > It requires you to wire the DMX to the hardware UART (which on an
> > arduino is usually not exposed and is dedicated to the USB-serial
> > interface)
> >
> > On Thu, Apr 7, 2016 at 2:07 AM, robb <sf99er at gmail.com> wrote:
> >> as it turns out, mathertels DmxSerialRecv example works out of the box
> >> w/Arduino 1.6.8 but my connection from DE to RE was loose. jerkey
> looked at
> >> it and squeezed it and it started working!
> >> w/DMXSerialRecv:
> >> DE & RE are connected together & to pin 2.
> >> RO is connected to Rx.
> >>
> >> cheers
> >>
> >>
> >>
> >> On Fri, Apr 1, 2016 at 5:19 PM, robb <sf99er at gmail.com> wrote:
> >>>
> >>>
> >>> //       Turns out that as I'm using an ungrounded power brick, I
> probably
> >>> don't need all of this, but I had all the parts so I made them anyway
> :)
> >>>
> >>> easier to switch power supply, than to add isolation
> >>>
> >>> //       Take a look in HardwareSerial0.cpp; it looks like you'll want
> to
> >>> search for USART_RX_vect and USART0_RX_vect.
> >>>
> >>> thx, found it. after editing file, still couldn't receive tho.
> >>>
> >>> //        This probably changed when the Arduino folks started making
> >>> boards with more than one serial port.
> >>>
> >>> i think your right
> >>>
> >>> //        Nothing so far -- I'm making lighting stuff for my wedding
> in a
> >>> couple of months, and I want a friend who does a lot of DMX lighting
> to be
> >>> able to control my hardware with his controllers!
> >>>
> >>> congrats & i look forward to seeing your implementations!
> >>> i'm hoping to eventually add 7segment leds displays for setting the dmx
> >>> channel w/up & down buttons, if i get it working.
> >>> different modes would be nice, too
> >>>
> >>> cheers,
> >>> ~r
> >>
> >>
> >>
> >> _______________________________________________
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> >> Noisebridge-discuss at lists.noisebridge.net
> >> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >>
>
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