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I actually just remembered I had a 9XR in a corner, can see if I can scope the signal...
I took it out, plugged one of my DFHTs to the JR port, and... it's been running happily for 10 minutes now, so nothing to see. Note the 9XR is an early one (January, still with an atmega64). No idea if they've changed something that could be related. |
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Curious. This is a newer one with the 128 (I believe that is what openTX said). Are you running openTX or the default firmware? Is this just the arduino and sensor board or is this one of the fatshark compatible ones?
The JR Port (internally) is the one I could get a signal into (but only for a limited time). Hmm I don't think they would change the coupling between versions. That seems odd. The thing that really gets me is that it needs a "cool down" between the short working times before it will function again. I need to leave everything off for a few minutes before attempting to get it working again. Using the JR port did you connect just signal or signal and ground? What power source did you use? I can try and replicate your setup as close as possible and see if that helps any Perhaps I should try a different arduino board (Maybe there is something off on this one??) Thanks for the help I really want this to work |
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I'm using an arduino pro mini, powered by an independent 2s lipo.
The "cool down" thing is what suggests the AC coupling (when the tracker is giving a signal a capacitor in the signal path would slowly charge, and end up clipping the signal, when you power down it takes some time to discharge, then it's good again for a moment). Do you have the PPM wire soldered directly to the arduino MCU's pin, or is there a resistor in line? That could make a difference. |
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I have the PPM wire direct but as near as I can tell (several minutes now) it is fixed! The "cool down" thing would make sense the way you describe it for the AC coupling (out of my depth there if it wasn't already obvious lol) but it also suggested to me something overheating or overflowing etc so I tried a new arduino ... with perfect results! Thank you so much for the help! Without knowing that another 9XR worked I would have still suspected the radio or the circuit going to it rather than an issue at the source! I should have tried swapping the arduino earlier but it behaved perfectly in the gui so I didn't think that was it.
Back to the resistor.. should I have one there? If so what value would be best (or does it depend on other factors like the tx etc?). |
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Ok Great Thanks again for the help. This new arduino also responds a LOT faster (the graphs are not delayed at all in the radio where as even when the old one was working it was much slower. I can't wait to get this setup on my truck/planes now
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That sound great. What board is it and where did you get it from?
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Spoke too soon... The tracker started acting *funny* connected to the radio (panning by itself, not centering, freezing when centered until the button was pushed again sometimes etc. I thought maybe it was a calibration issue but when hooked up to the computer the graph wouldn't start at all. I think another IMU just bit it This is the 3'rd from DX I think that have failed now so I've got some coming from ebay (and a few more arduinos just in case and for other things). Another month... yay.
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Funny you would mention that given that after trying on the radio the tracker still worked (after a fashion) so I had to rule out the imu as welll. After much testing and rewiring everything it turned out that my recenter button (recycled from the old electronics graveyard) was shorting out frequently causing all sorts of issues. I swapped it out for another (also from the graveyard) and it is once again working flawlessly. The upshot of rewiring everything is now I've got the sensor board mounted on the arduino instead of using wires which makes it more compact Good call on it being on the arduino side.
I took out my truck for a spin with the tracker and it was almost spew inducing (I need to reduce the gain a lot). Super responsive. Having the recenter/pause switch on the radio is fantastic! I've still had no luck calibrating with the rotation method but the axis method has worked great (using 1.0.2 firmware/gui). Sorry for the misdirect on the imu. I'm used to those not working right Hopefully this may help someone else if they experience similar issues (not likely I know). |
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Finally got around to using my HT today. Wow, it was great. Been too busy with the young fellow and his soccer on weekends. Soccer season is over and now I have more of the weekends to myself (hopefully). I had the centering set on my work bench to what seemed correct, but now that I am flying with it, it needs a slight tweeking for correct centre. Other than that, no problems.
Oh, problems. I did mention a few pages back about my transmitter blanking out while testing the HT on the workbench. One theory was a faulty/ dirty power switch. Another from my friend was a dry joint on one of the control pots. This blanking out has happened to me about 6 times. Each time is only when the HT is connected. I have a Chainlink LRS fitted to the 9X. I have been suspicious that RF is getting into the HT's lead (even though it is a shielded lead) and into the 9X causing havoc with the PPM stream, hence the blanking out. Before flying today, I fitted a very small torroid with 3 turns (salvaged this from some old circuit board) of wire in series with the PPM wire inside the 9X. I did not have one glitch what so ever, neither on the work bench or at the flying field. So, moral of the story, those running this HT with a UHF LRS and a Turnigy 9X, you may need a small inductor in series with the PPM wire. |
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Success!
An update from me..
I bought an IMU from DX and like a lot of other frustrated builders - it didn't work. I'm please to say that I've now got another IMU from this place:- http://www.ebay.co.uk/itm/3105137938...84.m1497.l2649 and it works!! Can't wait to try this out later! Happy building. |
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Quote:
I am using dragon link with the 9x and the ht .. never noticed any problems with rssi ... i did not go more then 4 km though ... so it may come one day .. but you may have a bad soldering or something ... ?? |
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It is not an rssi or distance associated problem. As I said it happened each time while I had the plane next to me (work bench and at the field). Last weekend it happened at the field while I was setting things up. When this happened, I disabled the HT and went back to manual knob twiddling. This weekend with the choke coil in series it never happened at all. Maybe we have different quality connecting cable. I used an old USB lead to connect the HT to rear socket I fitted to the 9X.
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Quote:
All I have to do now is modify a servo for 180 degree rotation and we are rockin' . |
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