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Author Topic: what circuit layout does capsense use?  (Read 1523 times)
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Oregon
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Using capsense library with multiple inputs, do you use this layout?


Or this one?


Or something else?

edit:  On the second drawing I meant to have the third input after the resistor.


* capsense q 1.gif (3.69 KB, 640x400 - viewed 30 times.)

* capsense q 2.gif (3.28 KB, 501x300 - viewed 38 times.)
« Last Edit: October 30, 2011, 05:14:17 pm by aefields » Logged

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If you look at the demo sketch on http://www.arduino.cc/playground/Main/CapSense you will see that it describes the circuit for a single send pin and multiple receive pins:

Code:
CapSense   cs_4_2 = CapSense(4,2);        // 10 megohm resistor between pins 4 & 2, pin 2 is sensor pin, add wire, foil
CapSense   cs_4_5 = CapSense(4,5);        // 10 megohm resistor between pins 4 & 6, pin 6 is sensor pin, add wire, foil
CapSense   cs_4_8 = CapSense(4,8);        // 10 megohm resistor between pins 4 & 8, pin 8 is sensor pin, add wire, foil

One resistor per sense pin.
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'Way down at the bottom of....

http://sheepdogguides.com/arduino/art3capsen.htm

.. you'll find a diagram... red, teardrops.

(Other stuff in that may help, too.)
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