AWOL, yup I tried and it can read the 490 Hz.
It looks like pin 8, ICP1, the Input Capture pin for timer0/counter0, is open-circuited, and it sees only power frequency noise. An easy way to test this is to connect a high-value resistor - like maybe 100k - between pin 8 and either ground and VCC, ort turn on the internal pullup resistor for pin 8. [/quote]
tmd3, so, i should try connect resistor between pin 8 and ground is it and dont i have to feed with any signal? by the way, what is ort?