--- In "naturalwatt" <> wrote:
>
> --- In "osmicadu" <osmicadu@> wrote:
> >
> > Hello,
> >
> > I have a question about AD converter on TS-7250.
> >
> > On my board I don't have a real time clock and the only adc I
have is
> > the 5 channel one that comes originally with the board.
You may not realise that the ADC is not part of the TS board, it is
built into the ARM processor. So you should be extra careful never to
over volt the inputs and to protect against ESD. The inputs are 3.3V
max.
In practice this really means buffering as suggested above. Something
like a op-amp configured as voltage follower.
Make sure it's output range goes as close to zero as you need.
/jacques
> > What I would
> > like to do is to simply connect a sensor to my board which gives
> > values from 0-3V and to convert it on one channel on my TS-7250
so
> > that I can transport it through a network to my PC.
> >
> > Now is this possible whit out the real time clock on my board
because
> > I have to read the sensor same every 5 seconds. Also is it
problematic
> > to set it up on the 5 channel adc that originally comes with the
board.
> >
> > Any comments and recommendations are welcome.
> >
> > thank you all.
> >
>
> The Real Time Clock is available so you don't have to manually set
the time and date every
> time you power it up. There is also ntpclient which can set your
internal clock as long as
> you have network (Internet) access.
>
> There are limitations on using the provided ADC. It is a low
impedance device which pulls
> towards about 2.5V, so you might need a buffer amplifier if your
voltage source is high
> impedance.
>
>
>
> Martin
>
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