Low cost high quality DMX multi-chain interface for RPi
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- Posts: 15
- Joined: Wed Nov 04, 2015 10:29 pm
- Real Name: Phil Smith
This is a picture of the pi with proto hat whilst testing.
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- Posts: 15
- Joined: Wed Nov 04, 2015 10:29 pm
- Real Name: Phil Smith
Oh is that how you're supposed to do it! I'm embarrassed by my effort now..
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- Posts: 86
- Joined: Wed Sep 12, 2018 10:44 am
- Real Name: Richard
Its not been tested yetPhil Smith wrote: ↑Thu Nov 01, 2018 5:04 pm Oh is that how you're supposed to do it! I'm embarrassed by my effort now..
Looking neat is one thing, but actually doing what its supposed to is something altogether different!
And if it wasn’t for the hard work of others I would never have known how to do it at all.
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- Posts: 5
- Joined: Sun Jun 05, 2022 10:31 pm
- Real Name: Tim Liebe
Hi all,
I'm attempting to build one of these myself, following the instructions others have described above. Unfortunately so far I've been unable to output to my lights. I've attached an image of my setup and the datasheet for the IC I'm using. The list below is everything I've tried/checked so far. Hopefully someone else sees the missing piece that I'm overlooking!
Thanks,
Tim
I'm attempting to build one of these myself, following the instructions others have described above. Unfortunately so far I've been unable to output to my lights. I've attached an image of my setup and the datasheet for the IC I'm using. The list below is everything I've tried/checked so far. Hopefully someone else sees the missing piece that I'm overlooking!
- Triple checked all wiring
- Disabled bluetooth output per Massimo's instructions
- Checked pin voltages:
- Pin 4: 4.83V
- Pin 8: 0.01V
- Pin 12: 4.82v
- Pin 16: 4.80V
- Used a second MC348N
- Swapped the +/- outputs (blue and yellow wires)
- Tried multiple cap values, and using no cap at all
- Ensured universe 1 output is set to UART
Thanks,
Tim
- Attachments
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- MC3487P.pdf
- (160.22 KiB) Downloaded 214 times
- GGGss
- Posts: 3145
- Joined: Mon Sep 12, 2016 7:15 pm
- Location: Belgium
- Real Name: Fredje Gallon
Without a scope or a DMX tester, you cannot judge if the DMX timing is respected so your fixtures will accept the DMX payload...
I can't see problems with your circuitry, except for the fact that you have all 4 blocks working, which is unnecessary. You can only use 1 of the 4 blocks.
I don't understand why the capacitance is between V+ and gnd. It will short-circuit high frequency voltage ripples.
I can't see problems with your circuitry, except for the fact that you have all 4 blocks working, which is unnecessary. You can only use 1 of the 4 blocks.
I don't understand why the capacitance is between V+ and gnd. It will short-circuit high frequency voltage ripples.
All electric machines work on smoke... when the smoke escapes... they don't work anymore
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- Posts: 5
- Joined: Sun Jun 05, 2022 10:31 pm
- Real Name: Tim Liebe
I appreciate you taking a look. I had initially wired it up with only one block and without the capacitor, but when it didn't work I figured I'd copy Phil's layout to a T. I may try some more experimenting. I'll post my solution here if I get it to work, otherwise I'll probably just pick up a USB adapter.GGGss wrote: ↑Tue Jun 07, 2022 8:37 am Without a scope or a DMX tester, you cannot judge if the DMX timing is respected so your fixtures will accept the DMX payload...
I can't see problems with your circuitry, except for the fact that you have all 4 blocks working, which is unnecessary. You can only use 1 of the 4 blocks.
I don't understand why the capacitance is between V+ and gnd. It will short-circuit high frequency voltage ripples.
-Tim
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- Posts: 5
- Joined: Sun Jun 05, 2022 10:31 pm
- Real Name: Tim Liebe
Turns out it was just a bad SD card. I clued into the issue when I kept having to re-flash the image after rebooting. Bought a new SD card and everything worked like a charm. I did also have to disable Bluetooth to utilize the UART pin.
I attached some pictures of my build along with the vero layout I came up with. I've also uploaded the files for the case to Thingiverse in case anyone would like to use the design.
Thanks to all!
-Tim
I attached some pictures of my build along with the vero layout I came up with. I've also uploaded the files for the case to Thingiverse in case anyone would like to use the design.
Thanks to all!
-Tim
- Attachments
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- Vero Layout.pdf
- (32.95 KiB) Downloaded 327 times
Last edited by liebetim on Sun Jun 12, 2022 5:41 pm, edited 1 time in total.