using multiple pressure sensors on a single arduino

Other Hardware Sensors
1

im planning to create a electric piano-like gadget with about 20 pressure sensors (1 for each "key"). my question is:

  1. is it possible to connect them all to a single arduino(preferably in a single pin)? if so, how?
  2. can the arduino recognize which pressure sensor i am pressing on?

thanks in advance

2

You can use an analog multiplexer. They come in 8 or 16 channel versions. For an 8 channel chip, you would use 3 digital pins to select which input you want, then the appropriate channel will be routed through to your single analog input.

The multiplexer itself has a separate pin to select the chip. If you want more than one multiplexer chip, you simply use a different digital output pin to select each each chip.

So with a bunch of these chips you could build up quite a large keyboard.

Edit. Just found this http://playground.arduino.cc/learning/4051