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Offline SScnc

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Input Noise
« on: August 18, 2011, 12:57:53 PM »
I'm having noise issues with false triggers on my input pins. Is there any settings to filter the noise? Kind of like the debounce?

Thanks

Offline borisz

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Re: Input Noise
« Reply #1 on: August 18, 2011, 01:37:40 PM »
Can you please add a schematics how and what you connected to PoKeys?
For digital inputs there is no hardware debounce. There is a very cheap and easy way to get in order with hardware.
For example 100nF ceramic capacitor connected to between PoKeys input and GND could help a lot.
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope

Offline SScnc

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Re: Input Noise
« Reply #2 on: August 18, 2011, 02:30:53 PM »
I just have 7 switches all as digital inputs. Do I need a capacitor for each input? The terminals on the board are very small.

Offline borisz

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Re: Input Noise
« Reply #3 on: August 18, 2011, 02:45:16 PM »
Yes, you need cap for each input.  Please connect them with shortest possible wires.
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope

Offline SScnc

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Re: Input Noise
« Reply #4 on: August 18, 2011, 03:54:10 PM »
How am I suppose to put 7 caps on this board with how small the terminals are?

Offline borisz

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Re: Input Noise
« Reply #5 on: August 19, 2011, 02:23:17 AM »
One by one.
Just do it it can be done ;)
www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope

Offline SScnc

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Re: Input Noise
« Reply #6 on: August 19, 2011, 08:58:11 PM »
Okay I got it done. Seems to work well. No false triggers.

I didn't have any 100nF caps. All I had was 1.0uF but it seems to work well. Thanks