Hey all, Ive been having quite a lot of issues trying to setup Ardupilot and the MinimOSD. I did have the minimosd working at one point (after having to get 2 replacements) however, after adding telemetry (which works very well) I no longer have any OSD.... or video. At all times my OSD gets very very hot, im talking too hot to touch here. Im using APM 2.5 with the power module and im getting the 12V for the OSD from a 3S balance plug. All Vtx is receiving the 12V.
In addition to all of this im getting no servo response through the Ardupilot. If I connect the servos directly to the receiver I get movement from the servos just fine, but nothing at from the ardupilot, even though you can see from the mission planner that the ardupilot is receiving the commands from my 8FG.
Im getting pretty sick of this to be honest, my Venturi wing build has stalled as I do not want to continue with any further cutting until I know everything is working reliably. Im almost at the stage of returning everything to BYOD and selling the wing on here along with everything else that I have. Its getting to the point where I am no longer having any fun.
Any help would be appreciated, if I cannot get this up and running before the end of the week there will be a job lot going on classifieds.
What version of minimosd do you have ? early ones had an issue with the regulator.. on later ones you power one side with 12v and the other side with 5V...
If they get too much voltage they heat up.. but you say your using 3S balance plug.. so strange.. how do you have the grounds connected ?
What channels / pins are you connecting the servos to ?
Also I note you have the power module.. but to be honest its not that great for powering servos.. so how are you powering the servos and do you have JP1 removed on the board ?
I have a few APM's on Multi with gimbals.. with MinimOSD installed.. all working fine.. but have yet to fit one to a fixed wing.
This is a manual I put together for Arduopter that also included MinimOSD that you might find useful http://www.multi-rotor.co.uk/index.php?action=dlattach;topic=676.0;attach=2828 (http://www.multi-rotor.co.uk/index.php?action=dlattach;topic=676.0;attach=2828)
Hi jumpy, I've got V1.1 osd connected as indicated in the wiki. I will go through my whole setup and draw it all up and post on here. I'm beginning to think its something I'm doing, but I don't know what. I'm thinking my osd is toast now too. If so then that's me buggered :-(
For the minimosd I would power it via a 6 volt UBEC. even V1.1 (Many UBEC have the option of 5 or 6v via a jumper)
regards
Andy
Here's a drawing of how I have got everything connected. From what I can determine, the heat is being generated from the 5V side of the minimosd. Any help would be much appreciated.
Looks fine to me..
Couple of questions.. do you have the power jumper plug in or out ?
Do you get video.. ie: can you see the camera.. (camera feed ok.. just no OSD ?)
Note: The APM will not send Mavlink data without forcing it or initiating a Telemetry session via the 433mhx radio.
Quote from: ROVguy on May 06, 2013, 12:57:59 PM
Here's a drawing of how I have got everything connected. From what I can determine, the heat is being generated from the 5V side of the minimosd. Any help would be much appreciated.
I think its the 12v in from the lipo to the MAX7456 that is the problem. The little regulator on the MinimOSD is just not up to it, because the MAX7456 uses a lot of current As I said before, where you have the 12V feed from the balance leads, I inserted a 6v ubec so that the linear regulator on the chip only has to drop 1 volt, rather than 7 ( Actually it may even be a 3.3 v reg) As far as I remember I soldered the onboard jumpers so that the whole MinimOSD was powered from the UBEC, so I had no 5v line between the Ardupilot and the MinimOSD. I am assuming the Ardupilot is not powered through that 5v line as it seems you have powered it via the ESC? It may be that the 5v reg is fried and now pulling the Ardupilot 5v line too low.
Will have a look at my setup to see what I have done and get back to you.
If you have a voltmeter you could try measuring voltages and see if they are what you expect, especially between the arduino 5v line and ground.
regrads
Andy
As far as I'm aware and according to the wiki, the minimosd gets 5v from the Ardupilot, not from the 12v supply, which is used to power the VTx. The APM itself is powered from the 3dr power module, which is the preferred method of powering the Ardupilot. Having looked at my drawing again, I'm wondering if the 5/6v supply from the ESC's BEC could be causing an issue as that side of the Ardupilot should be an output not an input?
Does anyone have any idea why I'm not getting any response from the servos when run through the Ardupilot?
Have you checked for 5v on the output rail from the BEC in the ESC ?
Do you have a multimeter to check what voltages you have.. if so check input rail 5v and check output rail 5v...
Your MinimOSD should work.. it was only on V0.1 MinimOSD you had to modify as the voltage reg was crap.. but yours is later one and should be fine..
Happy to check your MinimOSD for you if you get really stuck.
It's been cleared off the kitchen table for the moment. I've contacted BYOD my supplier to see what they have to say, but I will get my meter out and see why readings I get. Thanks for your help so far guys
Sorry cant be more help.. diagram looks fine..
Offer stands can check for you .. but would involve posting to me
Sometimes better to leave and come back to problems like that.
Hope you get it sorted
Craig
http://diydrones.com/forum/topics/minimosd-black-screen-no-image (http://diydrones.com/forum/topics/minimosd-black-screen-no-image)
mainly this reply:
Do you use the same battery for video and APM ?
Sadly I blow out two minimOSD, first one by don't knowing it, second one just accidently. If you use common ground on video and data input (and by using one battery you definitely do that) your minimOSD is dead.
There must be huge red letters in minimOSD wiki not to do this which can looks like normal thing like common ground.
Now I just want to know what exactly blows out, maybe diydrones can give some helpfull hand. I changed max chip, but still no picture, atmega works fine.
Quote from: ROVguy on May 06, 2013, 08:32:07 PM
Does anyone have any idea why I'm not getting any response from the servos when run through the Ardupilot?
To get the Ardupilot working, have you tried disconnecting the MinimOSD and telemetry module? So going back to your original setup?
regards
Andy
Quote from: hase2 on May 07, 2013, 01:22:18 AM
http://diydrones.com/forum/topics/minimosd-black-screen-no-image (http://diydrones.com/forum/topics/minimosd-black-screen-no-image)
mainly this reply:
Do you use the same battery for video and APM ?
Sadly I blow out two minimOSD, first one by don't knowing it, second one just accidently. If you use common ground on video and data input (and by using one battery you definitely do that) your minimOSD is dead.
There must be huge red letters in minimOSD wiki not to do this which can looks like normal thing like common ground.
Now I just want to know what exactly blows out, maybe diydrones can give some helpfull hand. I changed max chip, but still no picture, atmega works fine.
Hase2 you are a star!! Thats exactly what I was doing!! You are indeed correct, they should highlight this! In fact to me its a terrible design flaw, there is no way I can fit another battery to power the OSD/FPV side on its own, so it looks like the whole idea of using Ardupilot has to be scrapped! They should really make people more aware of this.
Skyscraper, I will have a look at trying it without anything connected, but like I mentioned above. The whole thing looks like it could be scrapped.
Thanks all for your help.
Rich.
Maybe I've been lucky, but I have seen lots of posts from the guys having issues wit this too.... definitely something up based on the numbers with issues.
I have 4 copters fitted with Minim OSD. All of them have single battery and common ground. 5v from flight controller to atmega side and 3 or 4s (16.2 fully charged) to the Max side. I mod them only for onboard rssi and volts.
Been running with Miinim since around xmas, but maybe it depends where purchased from?? Mine are either rctimer or hobbyshitking
I'd say the Hobbyshitkings are the ones to go for - cheaper too.
One key thing ... When you upload fonts, you must power the MAX side of the board with 2-4s or it no work!! Many forget this. I also learned the hard way!!
Its for multiwii, but I don't suppose that matters.
I'll have to upload a vid of recent ones, but heres the one testing the last release of Multiwii software. Nothing fancy...
https://www.youtube.com/watch?v=V0RNm7ewEYk (http://www.youtube.com/watch?v=V0RNm7ewEYk#)
Same here can't get it to work, software side on computer works as it should(configured as I wanted and I can recall it back up on a reboot), my problem is it does not overlay any info, I just get the camera view with no info.(minimosd-extra)
Tried as Shikra said powering the vid side with 12v as I updated the Font set, still no overlay.
One question,.....just to make sure,...its firmware first then Font set yes ?
Cheers
It is firmware 1st yes Xup. I get the feeling that these things are very easy to blow and once they go they are gone for good. My most recent started off ok, but as it heated up it got progressively worse, lost overlay but kept video to eventually nothing at all.
I also have the feeling that my telemetry unit has gone now as well. Both the remote and local units 'find' each other, but I cannot connect through mission planner and Ive changed no settings :( this is getting beyond a joke.