Re: [Paparazzi-devel] PPM encoders with non-blinking LED

[Chris Gough]

I didn't work it out myself, Chris H helped me off-list (thank you).

Short story: LEDs won't blink on ATmega168 hardware when ATmega328
fuse settings are used. See the wiki for details.

http://paparazzi.enac.fr/wiki/ATmega168_PPM_Encoder_Board

Chris Gough


On Mon, Jan 10, 2011 at 7:22 AM, Simon Wilks <address@hidden> wrote:
> Hi Chris G,
>
> Did you work it out? I have one that is the same type as yours and
> experienced the same problem. I tried all kinds of things and could
> not get it going. I ordered a new one from ppzuav (the other one was
> not from them) and it worked perfectly.
>
> --Simon
>
> On Thu, Jan 6, 2011 at 3:58 PM, Balazs GATI <address@hidden> wrote:
>> Chris!
>>
>> I have got two PPM encoders (cant remember the version). None of them
>> blinks. But one of them definitely works for one year. (The other is a spare
>> one: never flown yet.)
>>
>> Balazs
>>
>>  Department of Aircraft and Ships
>>  Budapest University of Technology and Economics
>>  Twog + EasyGlider + 10 hours flightime in total
>>
>>
>>
>> 2011.01.06. 14:34 keltezéssel, Chris Gough írta:
>>>
>>> Another observation - the "wild jitter" on adjacent servo when JP1
>>> removed (PPM encoder unpowered) is actually a regular repeating
>>> pattern.. .
>>>
>>> On Fri, Jan 7, 2011 at 12:14 AM, Chris Gough
>>> <address@hidden>  wrote:
>>>>
>>>> PPM encoder is powered from from the reciever (JP1 present). I tried
>>>> different recievers powered by different BECs (all 5v). Same behavior
>>>> with a 5A capable BEC, Multiplex IPD receiver and only one 9g servo.
>>>>
>>>> I just tried two 5v BECs and JP1 removed. Still no blinking.
>>>>
>>>>
>>>>
>>>> On Thu, Jan 6, 2011 at 11:55 PM, Eric Parsonage<address@hidden>
>>>>  wrote:
>>>>>
>>>>> Chris
>>>>>
>>>>> How are you powering the ppm encoder and the receiver ? I think this is
>>>>> the most likely cause of the problem.
>>>>>
>>>>> Eric
>>>>>
>>>>>
>>>>> On 06/01/2011, at 11:18 PM, Chris Gough wrote:
>>>>>
>>>>>> I have a bunch of PPM encoders (ATMega types, v4.3 hardware and
>>>>>> firmware) that do not behave as expected (from v4.2 manual). The LED
>>>>>> won't blink, stays solid when powered with PWM input (expected 3Hz
>>>>>> blink) and stays solid when PWM removed (expected1Hz blink).
>>>>>>
>>>>>> The PWM input to the PPM encoder seems OK because it moves a servo
>>>>>> (and I've tried multiple reciever/servo combinations). I don't have
>>>>>> ability to test if PPM is coming out at the moment. Reloading the
>>>>>> firmware doesn't change the situation.
>>>>>>
>>>>>> I don't know if it's relevant, but if I install a servo on a Y-lead
>>>>>> (ajacent to the PPM encoder, i.e. both getting same PWM), then
>>>>>> removing JP1 on the PPM encoder makes the servo jitter wildly, and the
>>>>>> servos on other channels of the same reciever jitter a little bit. All
>>>>>> servos return to normal when the unpowered PPM encoder is
>>>>>> disconnected.
>>>>>>
>>>>>> Did LED blinking behavior change between v4.2 and 4.3?
>>>>>>
>>>>>> Chris Gough
>>>>>> --
>>>>>> .
>>>>>>
>>>>>> _______________________________________________
>>>>>> Paparazzi-devel mailing list
>>>>>> address@hidden
>>>>>> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Paparazzi-devel mailing list
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> .
>>>>
>>>
>>>
>>>
>>
>> --
>> Balazs GATI, PhD
>>     Department of Aircraft and Ships
>>     Budapest University of Technology and Economics
>>
>> Address:   Budapest
>>          Stoczek u 6. J. ép. 423
>>          1111
>> Tel:       +(36)-1-463-1960
>> Fax:       +(36)-1-463-3080
>> Homepage: http://rht.bme.hu/~gatib/
>>
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