Re: Soil moisture sensors

["Keith Rathband" <notreal@xxxxxxxxxxx>]

I have some more questions about the interface circuit given,

The circuit shows an LT1761 IES-33 3.3V regulator - this seems to obsolete
with my suppliers, can anyone suggest an alternative.

Also - the circuit shows two 4.7uF ceramic caps, to isolate the sensor from
the circuit. I'm having difficulties finding suitable ceramic cap of this
value - can anyone one suggest an alternative ?

Thanks,

Keith.
"Keith Rathband" <notreal@xxxxxxxxxxx> wrote in message
news:d8kacc$oo0$1@xxxxxxxxxxxxxxxxxxxxx
> I'm trying to use a Watermark soil moisture sensor in the my home
automation
> project. I believe this sensor cannot be read as a standard resistive
sensor
> using a DC voltage across the sensor, the voltage across the sensor must
be
> A/C.
>
> Also, Irrometer who make the sensor don't seem to want to giveout details
of
> the sensor's response curve, and temperature correction details.
>
> So,
>
> Does anyone have, or know where i can get an interface circuit schematic
> diagram for the Watermark sensor.
>
> Does anyone have, or know where i can get details of the response curve,
and
> temperature compensation details.
>
> Thanks in advance
>
> Keith.
>
>