this is interesting... I would also be interested in such a
device...



>I only used the 1uf to 1mf as an example.  I want to
measure a broad
>range of capacitors, but I only need to know the
approximate value rather
>than the exact value down to the nth picofarad.  I want to
build a small
>device that measures the capacitor value and displays it on
a small LCD.
>And being cheap I would rather build something with a PIC
than purchase a
>multi-meter with capacitance measurement or even go to Tech
America and
>buy a capacitance adapter for my multimeter for $13 bucks.
:-)
>
>Adam Bryant (age 0x23)
>abryant@peaktech.com
>Parker, CO, USA
>Robotics, RC Airplanes, anything using a PIC
>
>On Mon, 1 Mar 1999 14:48:47 -0800 Lynx {Glenn Jones}
<jones_gl@EFN.ORG>
>writes:
>>well, if its just between 1uF and 1mF (which im guessing
its not :)
>>then
>>you can just build a simle audio oscilator out of a 555
and plug in
>>the
>>caps as timing caps. then you will have one tone for 1uF
and another
>>for
>>1mF
>>
>>----------------------------------------------------------
--------------------
>>A member of the PI-100 Club:
>>3.1415926535897932384626433832795028841971693993751
>>058209749445923078164062862089986280348253421170679
>>
>>On Mon, 1 Mar 1999, Adam Bryant wrote:
>>
>>> Dear PIClister's,
>>> Does anyone else out there have a drawer full of
anonymous
>>capacitors?  I
>>> was wondering about the feasibility of modifying the
Microchip app
>>note
>>> that does A/D conversion using a resistor and capacitor
and using it
>>to
>>> measure the capacitor instead.  Using the PIC as a timer
it should
>>be
>>> possible to get a semi-close measurement of the
capacitance and you
>>could
>>> even do auto-ranging and select different resistance
values
>>depending on
>>> the measurements you get.  I really don't need too exact
of a
>>> measurement, just something to tell me if a capacitor is
1uf or 1mf.
>> So
>>> I think it should be possible to build something fairly
low cost
>>using a
>>> PIC.
>>>
>>> Ideas? Thoughts? Suggestions?  Anyone done this?
>>>
>>> Adam Bryant (age 0x23)
>>> abryant@peaktech.com (work)
>>> adamdb@juno.com (home)
>>> Parker, CO, USA
>>> Robotics, RC Airplanes, anything using a PIC
>>>
>>>
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>
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