Capacitive sensor playground code not working on some pins

Projects Programming
1

I took the code from Arduino Playground - CapacitiveSensor and made it work for other pins (according to http://arduino.cc/en/Hacking/Atmega168Hardware)based on the code from project at Howto Build the eChanter - Version 3 - eChanter.com.

However this is not working for digital pins 0 and 1. Why? Can the code be reformatted to sense the capacitance similar to the way it is sensed in Arduino Playground - LEDSensor (where it senses the capactitance of the LED) or like done for Arduino Playground - HomePage? If so, how would those pieces of code be reformatted to work with one pin (those use 2)?

2

Pins 0 and 1 have built in pull up resistors for the serial line. I don't have a good idea on how the capsense library works, but you might be able to fiddle with some values to account for it.

If you use the bare chip, you won't have this problem.

3

Thanks! On the Arduino Uno rev 3 it seems these go to the 16u2 chip (http://arduino.cc/en/Main/arduinoBoardUno, so maybe that is why they are not working yet? I suppose I can try using other (analog) pins instead.

Also dont all the pins have pullup resistors?

4

How did you modify the code? How do you know it isn't working for the 0 and 1 pins?