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

From: Mohit Mundhra
Subject: Re: [Paparazzi-devel] Incorrect Battery Reading - TWOG
Date: Tue, 9 Jun 2009 18:57:34 +0530

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 +
>    <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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