Replies to This Discussion

ModeratorPermalink Reply by Chris Anderson on February 27, 2009 at 11:52am

Michal, I think you've got some problems you need to sort out before you turn to PID gains. Nobody else has reported that servo rotation issue, so if you're using the latest version of the code I think there's something wrong with your board. Can you check the voltage on the board and confirm that you're running ~5v?

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Permalink Reply by Michal on February 27, 2009 at 12:58pm

Chris, yes I can confirm that all out-pins (vcc-ground and servo pins) have 5.09V. Maybe there shoud be some other points to measure? Forgive my ignorance...

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ModeratorPermalink Reply by Chris Anderson on February 27, 2009 at 1:12pm

Do the servos work properly in manual mode? (MUX off)

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Permalink Reply by Michal on February 27, 2009 at 4:53pm

I got back to initial PID settings. Theres something wrong. There are two servos - one connected to Rx another to OUT2 Ardu. Here is the video what has happened during tests.



As you can see the first time both servos were working properly. After fist MUX switch second (Ardu) servo got mad...

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ModeratorPermalink Reply by Chris Anderson on February 27, 2009 at 5:18pm

It looks like the servo connect to the Rx is also moving sometimes after you switched the MUX. Is that correct, or were you moving that manually?

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Permalink Reply by Michal on February 27, 2009 at 5:34pm

Yes I switched to/from MUX in 13,16,24,30,55,59,1:32,1:39,1:51 second. Every other switch was due to some strange behaviour/interference. The first servo stayed normal at that time.

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Permalink Reply by 13brv3 on February 27, 2009 at 7:17pm

Do I see the mux led flickering when it should be on or off solid?
Rusty

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ModeratorPermalink Reply by Chris Anderson on February 27, 2009 at 7:22pm

Yes, his LEDs suggest that he's got something wired wrong or hasn't cleared the Attiny fuse correctly. The above video shows what the correct behavior should be. (if you turn the volume up you can hear the narration)

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Permalink Reply by Michal on February 28, 2009 at 1:10pm

I am trying to verify that I have propery flashed Attiny45. One error occurs inside AVRStudio while trying to flash Attiny45:
"ISP frequency must be 5 kHz or above when programming EEPROM or FLASH!". I folowed this tutorial. What have I done wrong?

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ModeratorPermalink Reply by Chris Anderson on February 28, 2009 at 1:12pm

What frequency have you set it at? 250khz is a good starting point.

Please read this tutorial for more.

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Permalink Reply by Michal on February 28, 2009 at 3:29pm

OK I reflashed with Jan 26, 2009 Fail_Safe_v15.zip (hex file created from the code in AVRStudio). Tripple checked for the fuses. Nothing changed - at the beginning manual mode works fine, after the first switch to auto OUT2 servo gets mad and looks like MUX diode is switched on and off with high frequency.
Here is my setup:

I dont have any clue now...

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ModeratorPermalink Reply by Chris Anderson on February 28, 2009 at 3:52pm

Please confirm the following:

--CKDIV8 fuses are unchecked in both Attiny and Atmega
--Board is running at >4.7v when measured at the servo ports and the VCC and GND next to the FTDI port.
--Atmega is running the current ArduPilot code
--This behavior is also seen when the GPS is connected and locked (blue led on)

If all that is true, I'd then like to know if the MUX light flashes even when there are no servos attached.

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