Pixel protocol (controller-to-pixel): Here a scope can come in handy. At the rates at which Ethernet runs, a scope is the wrong tool for the job. If not replace the Ethernet cable if it does, your problem is elsewhere. Testing Ethernet connectivity usually revolves around "Does ping work and does the controller web page come up. To debug this, you need Ethernet connectivity testing gear, not a scope. Lets start with E1.31Į1.31 is a data protocol that runs on top of Ethernet/IP. There are two different things that you are mentioning. So, what problem are you trying to solve? If you are trying to develop a new WS2811 driver, then you might want to invest in a 50Mhz or faster scope. If you are trying to determine how cable length is degrading your signal then a 10MHz scope should get you the data you need. You will see when data is being transmitted. Going back to the WS2811: if all you are trying to determine is whether the signal on the data line is present, then the noise you get on a cheap 1Hz scope is good enough. So, you need to tell us what type of pixel are you trying to debug? The ws2801 pixels can run at higher speeds and I suspect there are some pixels out there that can run in excess of 1MHz. A 10MHz scope will begin to tell you what you need to know at that speed. For example the ws2811 / ws2812 have two speeds 800mhz and 400mhz. The pixel data rate changes for different types of pixels.
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Lastly, do you have any recommendations on where I can see or learn about how to diagnose WS2811 using the oscope? My plan was that if I could not find any resources I would just start by baselining with an optimal setup and then introducing problems to see what it does to the square wave but it would be a lot easier if I did not have to learn that way. I am willing to invest up to $1000 to get something that is really good and gives me room to grow regardless as my knowledge of how to use the scope grows. Please look at the scope I just linked to in my previous post. I want to be able to check for issues related to wiring, distance, and the optimal resistor network values to put in the outputs. I want to be empowered with enough knowledge to know what I am looking at to see if there is a problem. I am trying to use it to troubleshoot communications between a controller like the e682 and WS2811 pixels. I have spent so much time reading online buying guides that all sum up with the same thing "What are you using it for?" and unfortunately I have been unable to find any resources that talk about oscope requirements specific to pixels. Thank you Martin, these are the kind of leading questions that I need to be asked. Hopefully that clarifies things, perhaps you can give me some guidance based on what I have said.Ģ014 Contestant on ABC's "The Great Christmas Light Fight" Lastly, once I have the thing in hand how do I learn what I am looking for specifically with pixel communication? I have never seen a tutorial or anything on using an oscope to troubleshoot for our hobby and I do not want to waste time reading or watching videos on using an oscope in a totally different application that does not at all apply to how I am using it.Īnyway, I was looking at this one, what do you think of it? W
One buying guide said to buy at least 2x the speed you need (so if e1.31 is running at 100Mhz do I need an Oscope that can do 200Mhz?) Our pixel speeds are running at 40ms and up (not sure how to convert this to necessary Mhz)Ģ. Here is what I know but not sure how to apply to product selection:ġ. Well the problem is that I do not know anyone in this hobby who uses an oscope so I do not know what specifications are necessary for what we do. However I am not sure when looking at these what the probes support because they do not say or they just say '1x - 10x' which I am not sure what that means.Īnyway, the real issue is applying all the knowledge out there to on oscope selection to what my application is (troubleshooting e1.31 or DMX or whatever) Almost all the buying guides say to start first with identifying what you need it for.
I read an article on purchasing one and it said to beware of the speed being advertised at 100Mhz if the probes can only support a fraction of that. Now after being asked that question I want to get one just for my own personal education. I am working with a company doing some troubleshooting at a major entertainment park and they asked me if I had one that I could take on-site to troubleshoot some communication issues. I want to learn though how to troubleshoot signal issues between the controller and the pixels. I do not know what I am looking at with the o-scope.
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