[Tinyos-help] Reading voltage levels

Alaios alaios at yahoo.com
Wed Dec 4 22:25:27 PST 2013


Hi 
as manual I guess you mean this one
http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=slas368g
at page 42. It would be easier for me to apprehend it if there was more text there. I still luck all this low level understanding but somehow I will make it.

Regards
A





On Wednesday, December 4, 2013 10:40 AM, Eric Decker <cire831 at gmail.com> wrote:
 





On Tue, Dec 3, 2013 at 10:05 PM, Alaios <alaios at yahoo.com> wrote:

Hi all,
>I am using telosb with msp430 processor. If I understood it right the ADC channels can be set to work with either 1.5 or 2.5Volts maximum. 
>

Like I said you need to read the user manual.

The 1611 provides an internal voltage reference of 1.5V or 2.5V.  But you can also use an external reference voltage.

If you need 3.3 or 3.0 voltages as input then you need to provide an external voltage reference and then need to program the ADC
h/w appropriately.  The ADC inputs can be driven from 0-AVCC which typically is the same as the digital VCC and they get tied together.

If you can work with 2.5 volts then you can use the internal reference.   


Seriously, read the manual.

  

>ADC is 12 bits so any voltage between 0 and maximum voltage would be mapped to these 12bits. I will need later to do the maths and see if that can give me mV resolution that the sensor needs.
>
>Regards
>Alex
>
>
>
>
>
>
>On Wednesday, December 4, 2013 4:49 AM, Eric Decker <cire831 at gmail.com> wrote:
> 
>
>
>The MDA300CA that Bipin mentions in its data sheet that the ADC inputs are 0-2.5 V so don't know if that works for your application.
>
>
>The telosb has a few ADC ports brought out to the expansion connector at U2.   I beleive you can use those for 0-3V.
>
>
>you should look at the manual for the msp430f1611 mcu.
>
>
>
>
>
>On Tue, Dec 3, 2013 at 12:04 AM, Alaios <alaios at yahoo.com> wrote:
>
>Dear all,
>>I am practicing on connecting external sensors on a telosb or micaz sensors and I need a bit of your experience.
>>
>>One of the sensors  I found on the market, that I would like to try, can work with 3Vdc (which I think is supported by telosb).
>>
>>The pressure reading would be returned of voltage values ranging from 0 to 3 Volts.
>>Which are the interfaces that can "understand" voltage values?
>>
>>I would like to thank you in advance for your reply
>>
>>Regards
>>Alex
>>
>>
>>
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>
>
>
>-- 
>Eric B. Decker
>Senior (over 50 :-) Researcher
>
>
>
>
>
>_______________________________________________
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>



-- 
Eric B. Decker
Senior (over 50 :-) Researcher



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