Mr Malund, I think your advise will solve my problem, but to be honest I still confused with your explainations
(my english is not very well :) )

You tell me to do these (according to me) :
1. change the program, the input is valid is only it is the same for at least 100ms
2. connect a 100 ohm resistor fronn +5 to the input pin
3. connect a capacitor 1uf from the input pin to the ground
4. put the switch between the input pin and ground
5. connect a tantalum capacitor (100uf)
from the +5 which is located near the 100 ohm resistor to the ground

could you please tell me more detail??
I'm realy realy sure that there are still many mistake in my interpretation.
(hope there is a schematic diagram that makes all the things clear)


thanks for all the help (especially for Mr Malund and Mr Sieraad)


best regard,


ridwan efendi