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Capsense library and arduino

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pyrohaz:
Hey guys,

So i've got my arduino and i've been using the capsense library quite a lot to detect human movement. I've found that it can be quite unreliable at times, depending no sensor placement (next to mains lines etc.) now i've been looking at commercial solutions and haven't been able to find anything that produces an output proportional to the distance of ones hand/body. I've found many products that can switch on or off with touch or proximity though. Can anyone aid me in my search for a capacitive sensor that produces a proportional output? Any info is useful!

(For those who may now know the capsens library: http://playground.arduino.cc//Main/CapacitiveSensor?from=Main.CapSense)

Thanks,
Harris

imjosh:
it's tricky business; good luck.

http://www.atmel.com/Images/doc10760.pdf
https://www.youtube.com/playlist?list=PLtQdQmNK_0DRkFhIq1d3QCcmyD2c71ghm

nctnico:
I'm not sure capacitive touch is the best way to go for distance sensing. I've used infrared distance sensors in a project and they could detect up to 50mm. The challenge is to determine a baseline due to ambient light and then detect changes which can be converted to a distance.

pyrohaz:

--- Quote from: imjosh on December 25, 2013, 05:05:19 am ---it's tricky business; good luck.

http://www.atmel.com/Images/doc10760.pdf
https://www.youtube.com/playlist?list=PLtQdQmNK_0DRkFhIq1d3QCcmyD2c71ghm

--- End quote ---

Thanks for the links. I've read through that PDF and they don't seem to say how you can get a continuously variable/quantized output of the distance from their chips which is annoying! Thank you anyway though.


--- Quote from: nctnico on December 25, 2013, 02:07:18 pm ---I'm not sure capacitive touch is the best way to go for distance sensing. I've used infrared distance sensors in a project and they could detect up to 50mm. The challenge is to determine a baseline due to ambient light and then detect changes which can be converted to a distance.

--- End quote ---

In this case, I do actually agree, I was hoping to design a musical product where a proximity sensor can be used to control parameters but unfortunately, Roland control all the rights on infrared/light based proximity detectors!

Does anybody know of other methods of human distance detection?

Thanks,
Harris

nctnico:
What do you mean 'Roland controls all the rights'? You mean they have patents for music instruments?

Another very good option is to use ultrasound. That probably works even better than infrared especially for short distances. You'd need some processing power though for filtering but with the modern ARM controllers that is no problem at all.

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