Problem with button

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi,
I'm new in arduino and I'm developing a project on Max/MSP using one piezo electric film as vibration sensor. I have not problem with that it works fine. And at the same I'm trying to use a simple button to send a signal to the program when it is pressed. Here is the problem. I have use the circuit in the tutorials, I use a 10kOhm resistor conected to +5v in arduino. The problem is that time by time I receive a change of state from the button but I not touch it. It's like an erratic jump from the digital input.
Please do you have any suggestion? I appreciate any idea about it.
Thank you very much in advance

2

you should probably debounce the button. Try to google Arduino debounce.

3

Are you sure you're using the circuit from the tutorials? The Button tutorial uses a pull-down resistor (10Kohm from switch to GND), not a pull-up as you describe.

4

Thank you MikMo and thank you halley for your swift answers. In one hand debounce could be a solution, but not when you don't know when the next push will be.
Concerned the circuit I have taken it from the Arduino tutorial:

I will try it as you suggest.
Thank you again.

5

but not when you don't know when the next push will be

Code to debounce a button only needs about 50 milliseconds - that's faster than any human could push the button

6

Thank you trialex, I will try it now.