My osd from CS8 has an issues. 1. The battery voltage on the OSD constantly reads 12.0V. I run off two 22.2V 10,000mah batteries at a time.. I got the CS8 RTF so I'm not totally up on everything under the hood but nothing jumps out at me. Any ideas? Thanks
Sam: I'm not sure which model of OSD you have -- but you may have to go back to the vendor from whom you got the RTF, I'm afraid. There's not enough information to answer your question, I'm afraid. Andy.
Thanks Andy, What other info would you need? I have a DJI OSD mk2. It's strange cos all the other info is correct like the pitch and roll and height etc.
I'm not familiar with the DJI OSD Mk 2, but based on http://www.dji.com/product/iosd-mark-ii (which shows a voltage of 24.1 on the screen), that would suggest that there may be a wiring problem with the way that it is connected into the system such that it's only seeing 12v. Or you have a faulty unit perhaps? Hope that helps. Andy.
I could try another unit. I have a second one here. Where does the osd actually take its reading from? It's being powered by the 12V outputs I have on the CS8 but it is plugged into the GPS hence why I'm getting the rest of the info..
Sorry...I don't know, Sam. Is there any documentation for the OSD? It seems to me that there should be a point where it is connected directly to the LiPo itself -- if it's connected to the output of a BEC/DC-to-DC converter, then it can only report the output from that converter and never the LiPo voltage. But I'd need to see the documentation that describes how the OSD should be connected up. Andy.
Sam, the DJI OSD should be connected to the DJI CAN HUB unit, which is fed from the flight control, which in turn should be directly connected to the main power source (through a power distribution board or something). This way it can "see" the mains' voltage. I suspect what happened is that whoever wired up the copter put the OSD on the "wrong side" of a BEC or 12V source. It needs to be able to sense the LiPo directly. This is what I do in my 6S DJI quadcopter that uses a DIO iOSD mini. I suspect the Mk II is the same. If this makes little or no sense (if you bought a fully-kitted RTF for example) you probably have to get the folks who built it for you to correct this error. It's not something you want to do if you're not very familiar with these things. I'm not sure which system you're using, but here's how it's done with a NAZA. It's probably similar with the WKM and A2.
Hi guys! Thanks for all the info! If you give me a sec I'll get some photos for you. It was an RTF so I didn't see under the hood myself I'm not totally up on it all but I'm not too bad. Sam
These photos might be more helpful! I think I can see the problem myself. Not sure how to fit it though.
Sam: Just out of curiosity, can you not contact the RTF vendor and ask? The only reason I say that is that it would be a lot more reliable than us trying to look at images and make informed guesses as to how things are wired... Andy.
Yeah. I couldn't get hold of him yesterday and was trying to sort it then. I have his number now thanks. Anything just out at you? Thanks, Sam
The second photo quite clearly shows the OSD's power coming from a 12V tap on the PDB. The power needs to come from the "mains" in order to properly see the main voltage.