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Re: [Paparazzi-devel] Strange Surging Behavior

From: John Burt
Subject: Re: [Paparazzi-devel] Strange Surging Behavior
Date: Mon, 12 Jul 2010 13:56:47 -0700
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20100227 Thunderbird/3.0.3

For Cularis and other efficient powered gliders I don't recommend using the motor battery (ESC) for powering the AP and other components. Doing so you risk running down the battery in the air and not having enough power to operate the plane for the considerable time it takes to land. That's why RC electric-glider pilots usually power RX and servos with a separate battery and BEC. For my Cularis Paparazzi project I power AP, modem, and servos using a separate 5V BEC and battery. The 5V line to the motor ESC is cut. I have had several flights where the motor battery cut out and I was glad to have this configuration.

Another advantage of a separate power supply is that you can power up the AP first, letting you set up the ground station link, and allowing the GPS to fix, before plugging in the ESC and activating the motor (which is always slightly unnerving with a 12x6 prop).

On 7/12/2010 1:06 PM, address@hidden wrote:
Thanks Felix,

For testing purposes, I disconnected my throttle so that I didn't destroy my table / limbs if the motor started (yes, I should always just take the prop off). I didn't even think that I was removing a 5 volt power source that gets hooked up to the TWOG! So while testing, the TWOG was trying to power everything on its own and overloading??

So am i correct to say that the 5V from the ESC (throttle input) actually powers the whole servo rail on the TWOG? ...When I remove my prop and connect the throttle input to the TWOG everything works great!


Quoting "Felix Ruess" <address@hidden>:

Hi Jeff,

BEC is an abbreviation for Battery Elimination Circuit, meaning you
eliminate the extra battery for the servos. It is basically just a
voltage regulator that produces 5V from your battery. As Maik said you
can just use the 5V provided by the BEC of your speed controller.

Cheers, Felix

On Mon, Jul 12, 2010 at 9:37 PM, Maik Höpfel <address@hidden> wrote:
Yes, especially digital servos can get very high peak currents. Just hook
them up to the BEC from your speed controller.

- Maik

Am 12.07.2010 20:15 schrieb "Felix Ruess" <address@hidden>:

Hi Jeff,

to me that sounds like your servos are drawing too much power with the
more rapid corrections of the AUTO modes. Especially since it works if
you have one or two disconnected.
If the servos draw too much current the voltage will break down and
the twog probably resets.
I would recommend to check that and maybe use an extra power source
for your servos.

Cheers, Felix

On Mon, Jul 12, 2010 at 7:07 PM, <address@hidden> wrote:
Hello All,

I am experiencing ...

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