Purchased my first shield half a year ago, just recieved a second one. The shield does exactly what I want it to do: Send dmx signals to my light installations based on sensor signals processed by my arduino.
There wasn't really any documentation at all, and it took some time to get going with the correct arduino library (I'm very new to arduino), but after a week of fiddling it was doing what I wanted it to do.
I needed to use this shield on a DMX LED PAR in master mode. I have tested with conceptic library and many Arduino (nano and mega). No way to make it work: I have tested with all different positions on switches. (I have tested with DMXMaster library too) I had the issue to upload the source code, that I have solved by unswitching UART and/or EN. Code is going to arduino then I reswitch EN, Master and 2 other swith in UART mode and nothing hapened on DMX light. My DMX PAR works well with address 4 at 255 (power) and 5 (RED) from 1 to 255 to light the RED leds. I have programmed this 2 address. On another hand, there is a small red light on the DMX PAR back. When we are speaking in DMX on the line from any source this led is blinking. With the DMX Shield it doesn't blink at all. How could we step by step test this shield, because after 3 days investigation, I think the board isn't working. When it works, I could buy many shield for Sound and Light shows. If I can't run it, I will move to Raspberry with EMTEC USB.
The product seems to be good quality, however i can't make it works in slave mode with the example sketch, led on pin 13 never lights on OR never turns off. it seems to bee no response at all. my DMX signal is OK and i try a 120 ohm resistor on the output XLR with no amelioration. Did someone had the same problem? is it possible that be the result of some electromagnetic perturbation ? if you have any leads contact me on the forum http://discuss.tindie.com/
The order was processed within a day, however the shipping took a long time, as advertised. For this reason the lack of a tracking code was quite a nuisance. The product itself works great and lives up to the expectations.
I have found this product, the DMX Shield, to be in great condition and of good quality.
However, I found getting it setup to be a bit of a challenge. Of course, ordering this product, even finding this website, you probably have a bit of tech skills. But, given I would qualify myself as such I still found it difficult to get the project started. Some of the Arduino sketches would not compile, and the LED blink (simplest of all) would not work. Needless to say I had to abandon the project as the development timeline was tight.
That is not to say it does not work, or you shouldn't get it. You just need to be well versed in electronics and have patience to get it working.
Here is a video explaining such blockages: http://youtu.be/i5IQNTGWybs?list=UUMp5mn-majlSdQEAnNHsuDw
Perhaps it is just a new product, but it would be great to see very clear documentation that was accessible from the site rather than having to chug through it on one's own.
Either way, still a positive rating. I will get it to work one day.