Pages: [1]   Go Down
Author Topic: What kind of light dimmer is this?  (Read 568 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Sr. Member
****
Karma: 1
Posts: 462
I am a amateur.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello!
In my bedroom, I have a light dimmer / switch (100_0016.JPG). What kind of dimmer is it? Is it a...
a) Capacitive Sensor
b) Pressure Sensor
c) Something else (specify)

How do capacitive sensors work?

Thanks!


* 100_0016.JPG (880.32 KB, 2592x1944 - viewed 24 times.)
Logged


Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 639
Posts: 34726
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
What kind of dimmer is it?
No idea from that blurry photo.

 
Quote
a) Capacitive Sensor
b) Pressure Sensor
c) Something else (specify)
How do you interact with it.
If you can control it with out actually touching it then it is capacitive. If you see some deformation before it changes then it is pressure.

Quote
How do capacitive sensors work
By sensing capacitance between the plate and ground as your body affects it.
Logged

Offline Offline
Sr. Member
****
Karma: 1
Posts: 462
I am a amateur.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote from: Grumpy_Mike
No idea from that blurry photo.
How much more detail is there to see? If you don't maximize the photo, it will be easier to see (my camera takes 5.0 Mega pixels).

Quote from: Grumpy_Mike
How do you interact with it.
You touch it with your finger. The pad seems to be made of metal, but I have a similar dimmer with a plastic coating.

Quote from: Grumpy_Mike
By sensing capacitance between the plate and ground as your body affects it.
Would the "ground" be "the Earth" in this case?

In Arduino, capacitive sensing only works when you connect it to the Earth somehow (e.g. desktop, USB adapter). Why can't Arduino use the battery's negative terminal as a ground?
« Last Edit: June 15, 2012, 05:09:26 pm by dkl65 » Logged


Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 639
Posts: 34726
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
If you don't maximize the photo, it will be easier to see
There is no choice with this forum.
Quote
Would the "ground" be "the Earth" in this case?
Yes

Quote
In Arduino, capacitive sensing only works when you connect it to the Earth somehow
No you can get capacitance between any two connections.
The arduino capacitance sensor method is not very good, it is only a sort of demo.
To do it properly you need a controlled layout and an oscillator that changes with capacitance then you measure the frequency.

Quote
The pad seems to be made of metal
So that could be an inductive injection. Or it could be capacitive.

Quote
I have a similar dimmer with a plastic coating.
So that would be capacitive.

It is extremely hard, if not impossible, to tell what a circuit is doing by just looking at the outside case.


Logged

Pages: [1]   Go Up
Jump to: