I recently got my shipment of 10 buzzers I ordered about a month ago, so as soon as I got them I was eager to make something fun with them, so I looked around a bit and searched for what to do with them, and by spending some time on www.arduino,cc and posting lots of questions on the forums, I figured out what I am going to make.
I decided to make an air piano which is based upon cap-sense and the arduino.
Basically, there are square pieces of aluminum tape stuck onto a thick card which is attached to a jumper cable and a resistor, 8 replicas of this are made, then all the other ends of the resistors are attached together and to pin3 of the arduino, this will act as the common base pin for all the sensors. The resistor values can be 2M or 10M or 40M Ohm. 2M Ohm will make it so that it only senses when you press on the aluminum tape, 10M Ohm resistor makes it so that your hand can be sensed at a little height of 2-4cm or so and 40M Ohm will sense quite a bit further, but it gets a little messy as if the aluminum tape pieces are too close together then at that height interference occurs therefore other keys might get pressed. If you want to use this 40M Ohm version then you have to make sure to place the aluminum tape pieces a little far away from each other.
I used 10M Ohm for my device and it works perfectly when I wave my hand over the note I want to use.
Step 1: What is Cap-Sense and how does it work
The principle behind this is that the aluminum tape detects the difference between human body capacitance and the capacitance of air, or in other words the aluminum tape is given a small voltage by the arduino which creates an electrical field in that area, and when our finger(being a conductor) touches it or moves close to it so as to disturb the electric field, we form a capacitor. This change is detected by the aluminum tape and therefore sends a signal to the arduino with which we can tell it to send a signal to the buzzer.
(I have heard that we can also use resistive sensing instead of capacitive but I’m not exactly sure how it works.)
For more information: http://en.wikipedia.org/wiki/Capacitive_sensing
Step 2: Pinout diagram and wiring
I attached a piezo buzzer to pin A0 or Analogue Pin 0, the common pin to pin 3 and the 8 different squares of aluminum tape to 4,5,6,7,8,9,10,11 pins.
Schematic in attached as an image.
Tip: Attaching wire to the aluminum tape its simple as the tape is sticky, but if you are using pieces of aluminum foil then its kind of hard to do it as solder does not work and you cant use a glue-gun or anything of that sort, so I would advice you to use some conducting glue if you can get hold of it
Here is a link where you can get some conducting glue.
For more detail: Arduino Air Cap-Sense Piano