proximity detector
Walter Harley (
[email protected]) wrote:
: : > I am looking for an electronic component and I am having trouble
: > articulating exactly what it is I want.
: >
: >
: > ** ----------- **
: > .
: > `- if any "matter" occupies the space between the **'s,
: > I get output of some sort.
: >
: > what are the options?
:
: Difficulty articulating a concept can sometimes be helped by redundancy.
: Can you tell us a bit more about what you're trying to achieve?
:
: One idea is to treat the **'s as a capacitor, use the capacitor in an
: oscillator circuit, and then detect the frequency. Because different sorts
: of matter generally have different dielectric constants than air, they will
: cause the capacitance to change, thus changing the oscillator's frequency.
:
: