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Topic: Input bouncing with nothing connected (Read 784 times) previous topic - next topic


Hi there, new to arduino, and fairly new to electronics.  I just recently bought an arduino uno starter kit.  As I was going through the beginning examples in "getting started with arduino"  When I got to the button press to turn on an LED I noticed that my button presses will jump high to low without pressing any button.  I went a step further and removed the button and watched the serial monitor and I can see it going from 1 0 randomly.  I've tried this on pins 7, 8, 9. I don't believe this is normal, but as I'm new I don't get it.  Any help would be appreciated.



The pins will do that with nothing connected, the example should have a pull-down resistor to ground that makes the input low while the button is up, when pressed the 5v should flow through the button making the input high.
Forum Mod anyone?


Thanks,. I tried a different button setup, with the pull down resistor and it seems to be working just fine today.  I was having this problem yesterday, thought i had it wired up the same, guess not.  Thanks! :D

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