This is an inexpensive USB to DMX interface constructed from a modded USBasp programmer. I am also providing the hex files for both with a starting address of one and a pixel length of 50. There is an assembly file that is good to use with either version. One for 2801 pixels and another for 6803 pixels. I am providing two versions of the main uDMX.c code. You can normally power up to eight 60ma pixels with just the USB voltage on pin 2 or otherwise use an external 5 volt power supply. Pin 1 (MOSI) is connected to Data In on the pixels. The pixel string is controlled through the 10 pin ISP connector on the interface. The resulting uDMX.hex file can be transfered into the interface by using any of the programming software listed on the USBasb site. This can be done by installing WinAVR and using the make command in the uDMX_1.4\sources\firmware directory. If you wish to change the pixel starting address, the pixel length, or the USB serial number, you will need to compile the source code. The uDMX firmware source code that this is based on can be found on this page: OLA can receive several different DMX-over-Ethernet protocols and output uDMX. This site has the Vixen plugin, the ArtNet app, and the Windows USB driver:Ī third way to use the interface is with OLA and another computer running Linux, such as a Raspberry Pi. The app can be set to output different universes. If the control software can be set to output ArtNet it can talk to the uDMX interface through the app on the same computer. Another way to get this to work is by using the Windows ArtNet app for uDMX.
Lighting control software with plugins for uDMX are not too common. General information on these programmers is found on the USBasp site here: You need a USB driver to get this to work with Windows. If you have two programmers, then one can program the other by connecting the ribbon cable between the two with one being set to reprogram. Some cannot be reprogrammed (to be avoided). They come in different flavors with most having the ability to be reprogrammed by setting a jumper or shorting two solder pads. It can control a single string of either 2801 or 6803 pixels.
It is a USBasp AVR programmer that has been MacGyvered with modified uDMX code to control pixels. My next project is a pixel controller that is small and cheap.
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