APM dancing servos mux issue?

Hey guys,I've just finished building my APM and have been going through the manual step by step. I seem to have hit an issue with the servo output for the dancing servo test. Ch1-4 are really jittery but 5-8 work fine. I guess it has something to do with the mux chip but dont really know what is going on.-No servos plugged, in power on (+5v to the pwr pin), everything looks happy, all leds on no flashing-power off-If I put a servo on ch5, pwr on, the servo sounds good no jitter just dancing! and the mux led flashes slowly, looks to have some relation to the dancing pattern-power off-move the servo to ch2, pwr on, the servo sounds like its stalled moving jittery only now and again, mux led flickers like crazy (pwr off nice and quick before something goes!)Any ideas?I did note this in the manual:"Also note that some of the early boards had the fuses in the Atmega 328 chip (PPM encoder) misprogrammed. If so, your board will not read all channels and will show glitchy servo output. If this is the case, please return it to Sparkfun for reprogramming."Sounds likely but I really don't want to return the board as I just got it and it would be like giving an xmas presents back to Santa! :(

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Dani Saez November 12, 2010 at 5:46am

Hi All,

I'm having the EXACT same problem, 0-3 outputs, go mad with dancing servos, 4-7 are OK. I've ust received the AVRISPmkII programmer, the thing is that I want to try first changing the brown out. Can please someone give me hint or a couple of lines on hout to proceed, I've just installed the AVR Studio and the WinAVR, but now I'm stuck, how can I check the value of the Brown Out, how can I get the JTAGICE mkII program runing in windows mode as in the pics Scott show?

Thanks in advance, I've got my quad ready to fly, only need to correct this.

Dani
3D Robotics

Chris Anderson October 7, 2010 at 7:52pm

If that is indeed your problem, you can reload the firmware yourself. Tutorials are here.

Before you do that, however, load the full APM software and test the RC inputs with the Command Line test programs. I'd be interested in seeing the data--if Sparkfun still has QA problems with their firmware loading, we'll need to inform them.

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APM dancing servos mux issue?

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