Qprox 113
Archiver
Posts: 46,084
I took the great suggestions I received from this list and purchased
the E11x demo board from Quantum, and it works great. But I have
the following problems:
1- I can activate the board by getting my finger close to or on the
sensing area. I can do the same with a piece of metal, certain type
of plastic but not with a piece of wood, a pencil or fork???? I
don't understant why?
2 What is the correct set up for the QT113 for my application which
consist of a rotating drum with rows of pegs sticking out of it. I
am placing a QT113 under each row. The analogy is a jewlery music
box. When there is a peg, the QT113 triggers a relay, when nothing,
nothing happens. The rows are about 1" apart.
Hope you can help.
Al
the E11x demo board from Quantum, and it works great. But I have
the following problems:
1- I can activate the board by getting my finger close to or on the
sensing area. I can do the same with a piece of metal, certain type
of plastic but not with a piece of wood, a pencil or fork???? I
don't understant why?
2 What is the correct set up for the QT113 for my application which
consist of a rotating drum with rows of pegs sticking out of it. I
am placing a QT113 under each row. The analogy is a jewlery music
box. When there is a peg, the QT113 triggers a relay, when nothing,
nothing happens. The rows are about 1" apart.
Hope you can help.
Al
Comments
the E11x demo board from Quantum, and it works great. But I have
the following problems:
1- I can activate the board by getting my finger close to or on the
sensing area. I can do the same with a piece of metal, certain type
of plastic but not with a piece of wood, a pencil or fork???? I
don't understant why?
2 What is the correct set up for the QT113 for my application which
consist of a rotating drum with rows of pegs sticking out of it. I
am placing a QT113 under each row. The analogy is a jewlery music
box. When there is a peg, the QT113 triggers a relay, when nothing,
nothing happens. The rows are about 1" apart.
Hope you can help.
Al
>the following problems:
>
>1- I can activate the board by getting my finger close to or on the
>sensing area. I can do the same with a piece of metal, certain type
>of plastic but not with a piece of wood, a pencil or fork???? I
>don't understant why?
The metal or your finger are relatively good conductors and can act
as the plates of a large capacitor. The certain type of plastic may
also be metalized. But the wood, pencil or fork (plastic fork??) are
not. You can turn a living plant into a touch switch, because it is
as much water as wood. Read the Qprox literature. It has pretty
good explanations.
>
>2 What is the correct set up for the QT113 for my application which
>consist of a rotating drum with rows of pegs sticking out of it. I
>am placing a QT113 under each row. The analogy is a jewlery music
>box. When there is a peg, the QT113 triggers a relay, when nothing,
>nothing happens. The rows are about 1" apart.
What is the wheel made of? The pegs must cause a significant change
in capacitance. Why a QT113 and not an optical or magnetic method?