Re: [Paparazzi-devel] Battery Measurement Problem

[David Conger]

I have familiarity with Apogee, I've never had the board tell me the
same value I see on my current limited power supply. It's close but
never the same value. Usually lower reported from the board. LPC2148
autopilots are more accurate and nearly exactly the same as the power
supply.

Just FWIW,
-David

On Tue, Jan 28, 2014 at 10:15 AM, Michal Podhradsky
<address@hidden> wrote:
> I barely remember seeing 9.4V on Lisa board when I powered it with USB only.
> Once it got "real" battery voltage it worked just fine, but I don't know
> what might be the reason.
> M
>
>
> On Tue, Jan 28, 2014 at 6:43 AM, Chris <address@hidden> wrote:
>>
>> Forget about my answer i was wrong the order has changed to a more logical
>> one so the code is looking fine.
>> Chris
>>
>>
>>
>> On 01/28/2014 04:14 PM, Kadir ÇİMENCİ wrote:
>>
>> Hi Chris,
>>
>> Thanks for the answers, as i see from the source code i m only using the
>> ADC14/PC4 on STM32F105 for battery measurement. After your answer i tried to
>> bind this channel as hard coded, at the end of the map like, but no change
>> still reading wrong ADC values from MCU. I guess i am missing something
>> about this ADC mapping..
>>
>> #if USE_AD1
>> #ifdef AD1_1_CHANNEL
>>   adc_channel_map[AD1_1] = AD1_1_CHANNEL;
>> #endif
>> #ifdef AD1_2_CHANNEL
>>   adc_channel_map[AD1_2] = AD1_2_CHANNEL;
>> #endif
>> #ifdef AD1_3_CHANNEL
>>   adc_channel_map[AD1_3] = AD1_3_CHANNEL;
>> #endif
>> #ifdef AD1_4_CHANNEL
>>   adc_channel_map[3] = AD1_4_CHANNEL;  // --> change in here
>> #endif
>>
>>
>> Thanks again..
>>
>> Kadir
>>
>>
>> 2014-01-28 Chris <address@hidden>
>>>
>>> I haven't checked (but if this is the case then i stand corrected, you
>>> are right.
>>> Chris
>>>
>>>
>>> On 01/28/2014 02:31 PM, Gautier Hattenberger wrote:
>>>
>>> Hi Chris,
>>>
>>> Do you have any issue while reading the ADC channels ? Because with the
>>> update version of libopencm3 the initialization order have been changed:
>>> https://github.com/libopencm3/libopencm3/commit/6570f6e
>>>
>>> Gautier
>>>
>>> Le 28/01/2014 13:26, Chris a écrit :
>>>
>>> If you have a stm32 board i think there is some errors in the adc_arch.c
>>> file
>>>
>>>   nb_adc1_channels = NB_ADC1_CHANNELS;
>>> #if USE_AD1
>>> #ifdef AD1_1_CHANNEL
>>>   adc_channel_map[AD1_1] = AD1_1_CHANNEL;
>>> #endif
>>> #ifdef AD1_2_CHANNEL
>>>   adc_channel_map[AD1_2] = AD1_2_CHANNEL;
>>> #endif
>>> #ifdef AD1_3_CHANNEL
>>>   adc_channel_map[AD1_3] = AD1_3_CHANNEL;
>>> #endif
>>> #ifdef AD1_4_CHANNEL
>>>   adc_channel_map[AD1_4] = AD1_4_CHANNEL;
>>> #endif
>>>   // initialize buffer pointers with 0 (not set). Buffer null pointers
>>> will be ignored in interrupt
>>>   // handler, which is important as there are no buffers registered at
>>> the time the ADC trigger
>>>   // interrupt is enabled.
>>>   for (x = 0; x < 4; x++) { adc1_buffers[x] = NULL; }
>>>   adc_init_single(ADC1, nb_adc1_channels, adc_channel_map);
>>> #endif // USE_AD1
>>>
>>> Here is what i think but i may be wrong as my daughter want me to play
>>> with her now and i can't think straight :-)
>>> This will load the adc_channel_map the wrong way.
>>> Suppose we use 2 channels then the first channel (AD1_1) should be loaded
>>> in "adc_channel_map[2]"
>>> and the second channel (AD1_2) in adc_channel_map[3] but here
>>> adc_channel_map[0]=AD1_1
>>> and adc_channel_map[1]= AD1_2.
>>> With this order those channels will not get converted because only
>>> adc_channel_map[2]
>>> and adc_channel_map[3] will be converted which contain the wrong adc
>>> input number.
>>> Chris
>>>
>>> On 01/28/2014 01:39 PM, Kadir ÇİMENCİ wrote:
>>>
>>> Hello everyone
>>> Today i have noticed that there is a problem with battery indicator at
>>> the GCS. I have fed a regulated 5v to the V_batt pin and i see the indicator
>>> shows 9.4 V. It is working regularly at the v5.0.3  release, but when i try
>>> to use master there is a problem with battery state like this. I don't
>>> change the voltage divider resistors (10k and 2.2k) and i have also tried to
>>> define the line
>>>
>>> <define name="VoltageOfAdc(adc)" value ="(0.0045 * adc)"/>
>>> which also the default value for Lisa m v2.0
>>>
>>>  Anyone who have encountered with this problem?
>>>
>>> Thanks
>>>
>>> Kadir
>>>
>>> Board : Lisa mv2.0
>>> Version : master
>>> Frame : Quadrotor
>>>
>>>
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