Michael (and anyone interested), there are some news. I tried my app with Mica2 mote and it works correctly:
ADC 321, Voltage 372
ADC 331, Voltage 372
ADC 339, Voltage 372
ADC 345, Voltage 372
ADC 293, Voltage 372
ADC 309, Voltage 372
ADC 324, Voltage 373
ADC 328, Voltage 372
ADC 333, Voltage 372
ADC 336, Voltage 372
ADC 378, Voltage 373
ADC 366, Voltage 372
ADC 357, Voltage 372
ADC 356, Voltage 372
So, there is a problem in the IRIS mote or in its driver. After I check
its datasheet.
Greetings,
--
Francesco Ficarola <francesco.ficarola_at_gmail_dot_com>
[GPG KeyID: 0xDBA99D92]
Francesco Ficarola ha scritto:
> Michael Schippling ha scritto:
>> Okokok, I'll stop impugning your BOB soldering...
>> sounds like it's "something else".
>>
>> There is apparently no public schematic for the IRIS
>> so we can't check what "they" though they were doing
>> hardware wise. The ADC channels should be independent
>> and just enabling one for reading shouldn't affect
>> the others, however if they are open maybe there's
>> some bleed through. Once you get your connector, try
>> just grounding the new ADC input and see what you read.
>
> If I connect ADC1 channel to the GND I read:
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
>
> Those readings are the same that I get by connecting the potentiometer
> to the break-out board and turning to one side ("2" in the following
> example):
> ADC1 1023, Voltage 733 <--- axle on side "1"
> ADC1 1023, Voltage 733
> ADC1 1023, Voltage 733
> ADC1 921, Voltage 705 <--- rotation
> ADC1 767, Voltage 602
> ADC1 607, Voltage 496
> ADC1 222, Voltage 330
> ADC1 0, Voltage 307 <--- axle on side "2"
> ADC1 0, Voltage 307
> ADC1 0, Voltage 307
>
>> What version of TOS are you using? It's possible, but
>> somewhat hard to believe, that the ADC code isn't switching
>> channels correctly. Or that the Voltage sensing is not
>> correct.
>
> Now I have TinyOS 2.1.0. After I can try with TinyOS 2.1.1 and see what
> happens.
>
>> On the mica's one needs to turn on an external
>> voltage ref in order to get a good reading (on mica2
>> at least, I forget about the micaz). If the VoltageC
>> code isn't doing that, then maybe everything you read
>> is noise.
>>
>> I only know mica2 under TOS1.x. I use 6 of the ADC channels,
>> including battery and RSSI, sampled at TOS_ADCSample240us
>> (the second slowest pre-scale setting). I have not noticed
>> (nor looked seriously) any cross-channel interference.
>> The mica's use a slightly different ATMEGA chip, but
>> it "should" work about the same.
>
> Yes... ATMega 1281 for IRIS, but, as you say, it should work about the same.
>
>> I guess you're on your own here. If you can characterize
>> the problem maybe you can get the suppliers, whomever they
>> are now, interested in fixing it...
>>
>> sorry...
>> MS
>
> I also found another topic with my problem:
> http://tinyurl.com/4e7dd9k
>
> Ok Michael... if I find anything interesting I will inform you and thank
> you very much for your help and your patience.
>
> Greetings,
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