Re: [Paparazzi-devel] Airframe BAT section

[David Conger]

Toby,

I just went there...too much info unless you just want to read a lot  
about my build.

I will save you some reading :)

"Well, Update, if you did like me and used the "default" resistors for  
building the Tiny2.11 there is one file to modify to have the  
autopilot correctly report the voltage of the battery.

File is:
$PAPARAZZI_HOME/conf/autopilot/tiny_2_1.h
on my system that is: /home/david/paparazzi3/conf/autopilot/tiny_2_1.h

Go to the bottom of the file and make this change:
#ifndef VoltageOfAdc
/* #define VoltageOfAdc(adc) (0.01787109375*adc) */
#define VoltageOfAdc(adc) (0.0247311828*adc)
#endif

See, I commented the orig. line and simply duplicated it with the new  
multiplier. I used the same one that Michael G. posted (and I reposted  
in this log).

Now in GSC my battery voltage reads 10.7 ... my EXTECH 382200 Current  
Limiting Power Supply says: 10.8 @ 0.12A ...close enough. "

The above is about two more pages into the build.

Hope it helps.

-David

On Jun 24, 2008, at 3:09 PM, TurboTas wrote:

> Hi Guys,
>
> does anyone have a working sample for a 2cell Lipo.  I started with  
> the default section as per th e wiki example and worked from there,  
> but no matter what I tried, I could not get the measured values to  
> match the actual battery voltage.
>
> I'm always under by around 3 volts.
>
> Any hints would be gratefully received.
>
> Toby.
>
>
>
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