Re: [Paparazzi-devel] Incorrect Battery Reading - TWOG

[Mohit Mundhra]

Thanks david, I was using the makefile from funjet only. I will change
that and check it tomorrow morning.

--
Mohit Mundhra

On Tue, Jun 9, 2009 at 7:57 PM, David Conger<address@hidden> wrote:
> Hello,
>
> The first line in the makefile section is the autopilot header file. Be sure
> you have the correct one.
>
> From the given funjet1.xml:
> <makefile>
> CONFIG = \"tiny_2_1.h\"
>
> If you have a Tiny2.1 this is appropriate. If you have a TWOG or Tiny2.11 it
> is not. You will have incorrect voltages reported. There is no flaw in the
> board or design and is simple to correct.
>
> I think the easiest is use this instead in the makefile:
> <makefile>
> CONFIG = \"tiny_2_1_1.h\"
>
> Then re-run GCS and check the voltages reported.
>
> HINT:
> This comes up very often and likely a search of the list archives would
> return several email much like this one.  :)
>
> -David Conger
>
> On Jun 9, 2009, at 6:27 AM, Mohit Mundhra wrote:
>
>> When I connected a 3S battery measuring 12.5 V, TWOG was showing 8.9
>> V; while when a 7.9 V battery was connected it showed 5.7 V. I just
>> now realized that it could be a problem of some resistor since the
>> ratio coming out is same in both case (12.5/8.9 = 7.9/5.7 = 1.4
>> approx). Are there any other reasons that may be there for this
>> incorrect reading?
>>
>> --
>> Mohit Mundhra
>>
>>> On Tue, Jun 9, 2009 at 2:24 PM, Mohit Mundhra<address@hidden> wrote:
>>> I connected a 2S Lipo battery to TWOG Board, but it keeps on showing
>>> 5.7 V on the GCS. I checked using a multimeter and found that the
>>> voltage actually is 7.9 V. I tried changing few battery configuration
>>> values but nothing actually worked out. Below mentioned is the battery
>>> section from my configuration file.
>>>
>>>  <section name="BAT">
>>>   <define name="MILLIAMP_PER_PERCENT" value="0.86"/>
>>>   <define name="VOLTAGE_ADC_A" value="0.0177531"/>
>>>   <define name="VOLTAGE_ADC_B" value="0.173626"/>
>>>   <define name="VoltageOfAdc(adc)" value ="(VOLTAGE_ADC_A * adc +
>>> VOLTAGE_ADC_B)"/>
>>>   <define name="CATASTROPHIC_BAT_LEVEL" value="6.0" unit="V"/>
>>>   <define name="CRITIC_BAT_LEVEL" value="6.5" unit="V"/>
>>>   <define name="LOW_BAT_LEVEL" value="7.0" unit="V"/>
>>>   <define name="MAX_BAT_LEVEL" value="8.4" unit="V"/>
>>>  </section>
>>>
>>> --
>>> Mohit Mundhra
>>>
>>
>>
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>
>
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