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

From: Balazs GATI
Subject: Re: [Paparazzi-devel] PPM encoders with non-blinking LED
Date: Thu, 06 Jan 2011 15:58:36 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; hu; rv: Gecko/20101207 Thunderbird/3.1.7


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.)


 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:

How are you powering the ppm encoder and the receiver ? I think this is the 
most likely cause of the problem.


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

Did LED blinking behavior change between v4.2 and 4.3?

Chris Gough

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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
Tel:       +(36)-1-463-1960
Fax:       +(36)-1-463-3080

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