Sporadically no input on channel 2 - PPM problem ? - Discussions

Hi everyone,

after updating my gps to 1.6 - and uploading the latest software to the APM - I am having problems with the radio test:

Sporadically I see no input on channel 2 (counting 1-8) which represents pitch/elevation (or IN1 on my APM 1.0 Board). All other channels seem to work O.K.

(Hardware: APM1.0+Oilpan, Rx-9 Synth IPD, Mediatek 1.6. No external power, just usb to APM .Mx16-s transmitter)

When that happens, the value for channel2 (or IN2 in the radio test output) does not change if I move the elevator stick. If I unplug the connector to the receiver, and plug in a servo, the servo moves.Plugging in the APM - no input (once the I got input after plugging in the APM again - but not reproducable).

Could this be the dreaded ppm problem? I would like to know before I buy the AVR ISP MKII.

TIA

Replies

P D January 20, 2011 at 12:31pm

Problem solved: I reprogrammed my APM like described in the manual "Programming the Atmega328p (PPM encoder/failsafe) the easy way", using W7-64, and the AVR ISP MKII.

Everything seems OK now - the servos run smooth, no more jitter, respond as they should.

Thanks for the help Martin !

PS: just did one test, the servos are behaving normally now. Still have to test the input on channel2 (the problem was just sporadical) some more.

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