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Permalink Reply by Michal on February 28, 2009 at 4:49pm

There is some problem when connecting to ATmea168 with AVRISP mkII in AVRStudio:"There seems to be a short circuit on the ISP connector. The SCK line(s) appear to be short-circuited. The peration will be aborted."
I have checked, unsoldered ATmega128 pins and soldered again. The problem is still here. I will check it once more tomorrow.

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ModeratorPermalink Reply by Chris Anderson on February 28, 2009 at 6:48pm

Assuming you've got the connector in the right way, it sounds like you've blown the Atmega chip. When you say "unsoldered the Atmega pins" do you mean you actually unsoldered the chip? If so, my hat's off to you--that's hard.

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Permalink Reply by Michal on March 1, 2009 at 4:02am

Thank you Chris but I meant pin connectors on PCB :). I will try to unsolder ATmega and put the new one. So as far as I understand the prcedure would be:
1. Change ATmega168 with fresh one
2. Reload software via FTDI board
3. Check the fuses via AVRISP
4. Tests, tests, tests...
I will post my experiences here :)

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ModeratorPermalink Reply by Chris Anderson on March 1, 2009 at 8:40am

Michal: to be honest, it's so hard to unsolder a surface-mount chip and resolder another one that it might be easier to just buy another board. That's why we make them so cheap!

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Permalink Reply by Gagarien on March 2, 2009 at 3:47am

Hi Michal I had sort of the same problem when I unchecked DIV8 fuse this weekend. I followed the Attiny programing instructions and could set my mux with a spare channel on my radio as advertised, but the mux LED was flickering with eratic servo movements. I quickly picked-up a problem from my side "Now you can go back to the "Main" tab and change the Settings to 2Mhz" as Chris stated. And Whola! it was working correctly now.

Hope this help.

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Permalink Reply by Michal on March 2, 2009 at 11:20am

Thank you Gagarien. I have to wait a little for a new board. I definately didnt change settings to 2Mhz as you described. This could be the cause but I will never now since I fried the ATmega168.

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Permalink Reply by Michal on March 28, 2009 at 4:35pm

Finally I have the new ArduPilot! At the begginning the new board had the same issues as the previous one. Serious servo glitches (connected to ArduPilot) was so wild that it was obvious for me something is wrong with RF noise around. I have changed RC Rx to Corona RP8D1 and put all devices to a small FPV platform.

Tonight I took a ride in my car with fuselage only. After setting up all equipment and turning it on I can say all glitches gone!. I set ArduPilot (ver1) to RTL mode and rudder movement proves that it will be flying well in autonomous mode. Next report should be from field testing (when weather permit).
The conclusion is that ArduPilot could sometimes amplify RF noise when testing it indoor. This is not a big issue since it is not intended to fly it inside small rooms ;)

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Permalink Reply by Gagarien on March 28, 2009 at 11:34pm

Hi Michal, good luck and let us know about your first flights.

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