Some thing neat to try ADC to read EMF with a wire

be80be

Well-Known Member

• Dec 18, 2012

• #1

You place a 10 inch wire on the AN0 pin of a pic with a LCD on it send the reading out about every 200mS if you hold the wire with your hand the reading drops lower then in the open.

place it by a motor the reading change hold it to a wall outlet and you'll get a big change so it's reading something I got the idea from here https://blog.makezine.com/2009/05/15/making-the-arduino-emf-detector/

I put a 3.3Mohm from gnd to the wire on AN0 and have fun

 

dr pepper

Well-Known Member

Most Helpful Member

• Dec 18, 2012

• #2

You could use a fet or opamp to increase the sensitivity

 

be80be

Well-Known Member

• Dec 18, 2012

• #3

Hey it was real cool i been thinking about this. See I made a small wave table that used cds as you blocked the light leds would come on but playing with this you could change value by where my hand was over the wire so there may be a way to use this with my wave table.

 

dr pepper

Well-Known Member

Most Helpful Member

• Dec 18, 2012

• #4

You talking about a pic theramine?, my mrs wants me to build one of those.

 

be80be

Well-Known Member

• Dec 19, 2012

• #5

dr pepper said:

You talking about a pic theramine?, my mrs wants me to build one of those.

Click to expand...

That's doable too I don't have the time to play with this right now but a theramin would be easy to make
I can see this working now I see a way to do this with a wire

This is what I want to make
[video=youtube_share;IkmpIXd9Q90]http://youtu.be/IkmpIXd9Q90[/video]

 

dr pepper

Well-Known Member

Most Helpful Member

• Dec 19, 2012

• #6

Too trendy for me, but theres probably money in that kind of thing.

 

be80be

Well-Known Member

• Jan 15, 2013

• #7

Well the idea is looking like it will work here a video I'm controlling the leds without touching sensor and it works in light or dark. I'm waving my hand over a bare copper wire.
[video=youtube_share;UKUYqt5rycY]http://youtu.be/UKUYqt5rycY[/video]

 

dr pepper

Well-Known Member

Most Helpful Member

• Jan 16, 2013

• #8

Now you need some clever sequencing code to flash the leds with

 

be80be

Well-Known Member

• Jan 16, 2013

• #9

See I made a small wave table that used cds as you blocked the light

Click to expand...

Can't use that in the dark mine you can and in the light to.

 

dr pepper

Well-Known Member

Most Helpful Member

• Jan 17, 2013

• #10

If you allways had an led on, a photocell would work, you'd get better resolution with your circuit as light from its own leds are not gonna mess things up.

 

be80be

Well-Known Member

• Jan 17, 2013

• #11

What's the lights in the room going to do ?

 

dr pepper

Well-Known Member

Most Helpful Member

• Jan 17, 2013

• #12

Lights in the room would be fairly constant, unless you walked past and created a shadow which would have a desired effect anyways.

 

be80be

Well-Known Member

• Jan 17, 2013

• #13

I did one with photocell it work ok for one light level but dark but when I use it with the lights on it changed the whole setup I want it to work every time the same.