Make Arduino sense when touching eg. soda can, foil etc. without MPR121

I'm wondering how you would get Arduino to sense that you touch a can of soda or eg. foil without using the MPR121! Any ideas? A schematic would me nice, and a good explanation! :smiley:

What is wrong with the answers you got in your cross post http://forum.arduino.cc/index.php?topic=427174.0

Cross posting is frowned upon here.

That was about the video. This is not. You started talking about the video, not giving me an answer.

I have given you the answer, that technique works with an Arduino equally as well as a MPR121.

The answer to your question was given here in your cross post:

Do you see any video here ?

Is there a problem reading a simple schematic ?

capacitive_sensor

CAPACITIVE TOUCH SENSOR.png

But he used a wrist band for this. This isn't what I want!!!

PaddiM8:
But he used a wrist band for this. This isn't what I want!!!

Why did you not say so at the beginning?

You need something with a much higher gain, I have used a CD4011 nand gate. Put one input to 5V, the other input to a 6M8 pull down resistor.

Alternatively use a proper capacitave sensor like this :-

Or approximate to it with this:-
http://playground.arduino.cc/Main/CapacitiveSensor?from=Main.CapSense