Why do we need resistors for a Touch capacitive arduino keyboard?

Can someone please explain the use of resistors in this project? What will happen if I don't use resistors here?

The Arduino measures the time it takes for the capacitance to charge up, through the resistors.
t = RC
If R were zero (or very low), then t would always be zero (or very low).
http://playground.arduino.cc/Main/CapacitiveSensor?from=Main.CapSense

Hello I just tried to run its calibration program without using resistors. When I don't touch the arduino, the values are like this:

30     130     163     74     75     368     125     199     0     0          148     0     63     22     23     0     379     130     130     163     74     75     368     125     199     0     0     0     0     0     33     7     21     8     43     17     33     11     1     32     12     30     0     30     5

However once I touch it, the values are

 51694     102773     102709     102723     102724     102719     102706     102745     102703     102716     102707

and even after I leave, the values don't go down. Is this normal? Can you please explain why this is happening?

That is a very sad and confusing Instructable. However, if you are simply leaving the resistors out, the inputs are floating and will show random voltages picked up from RFI, line hum, static electricity, etc. The values you are getting are meaningless.
I suggest you build the example capsense circuit. And use the resistors.

Thank you :slight_smile: