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DIO Change Detectiion flickering output

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I wanto to monitor a switch with multi entry on a machine.
I link one input to my xbee s2 zb module digital input DIO4 set as high
and the ouput of the switch to IO5 set as digital input
a 10kOmh pulldown resistor is put between gnd and IO5.
Before connecting the switch to this device I test it with a simple interruptor. It work well, I receive a message every time a change is detected. But as soon as I'm neear the machine (which is apparently not CEM compatible) even if I don't connect my xbee to the switch, my Digital input is flickering between high and low, like an antenna. What is wrong ?
asked Sep 1, 2016 in RF Solutions and XBee by chrisg1970 New to the Community (3 points)

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1 Answer

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Too much electrical noise getting on the radios inputs.
answered Sep 2, 2016 by mvut Veteran of the Digi Community (14,807 points)
Do you think the right methot is to filter the noise by putting a 10uF capacitance between input and ground ?
Finally, it works well by putting a 10nF capacitance between IO and ground !  The noise is filtered.