Re: interfacing 8051 with adc


madhava.Gadiche...@xxxxxxxxx wrote:
gautham wrote:
mkaras wrote:
gautham wrote:
hi,i am working project where i have interface a microcontroller with
an adc & an rf transceiver.what are the steps that i have to take to
interface the
microcontroller with the adc and the rf transmitter?i am planning to
use an atmel product.what series would be best for my
project?microcontrollers with inbuilt ADC'S are also fine.

You probably need to be a lot more specific as to what your project is
going to be,
what your intending to sample with the ADC, resolution you hope to
attain and the
sample rate that will be required. On the RF side we have no idea what
you think the
RF would be expected to be for. For all we know you hope to have the
microcontroller
enter into communications with your microwave oven.

- mkaras

well,to be more specific,the data input to the microcontroller comes
from a 220v, 50Hz power line,representing the power flow,voltage
etc.this analog data is interfaced with the microcontroller with an
adc.the frequency of the signal being less,any frequency on the upward
of 1MHz would work very fine.the resolution that i want is in the order
of a few hundred millivolt.therefore,i am planning to use a 14 bit
adc.my question is regarding the hardware interfacing of this adc with
the microcontroller. for example,how do i tune the microcontroller to
the frequency of the adc?would the results be accurate?the rf segment
is to connect the microcontrolller wireless to a remote host computer,
where detailed analysis of the data would be done.


Hi Gowtham,

Let me get this correctly. You actually want to connect the 220V 50 Hz
mains (AC) to the ADC and digitize it. Is that what you want to do?(pl
confirm)

Well, I have not come across an application like that. But I dont think
there is a ADC which can directly accept that kind of voltage (220v).

There should be some kind of scaling system in between. If that becomes
the case, I dont see how a 14 bit ADC will help. The margin of error
may be quite large (due to scaling sys).
May be something like a volt to freq converter.


Regards.

.

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