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Author Topic: Input Noise  (Read 1572 times)
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SScnc
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« on: August 18, 2011, 11:57:53 AM »

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
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borisz
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« Reply #1 on: August 18, 2011, 12:37:40 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.
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www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope
SScnc
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« Reply #2 on: August 18, 2011, 01:30:53 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.
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borisz
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« Reply #3 on: August 18, 2011, 01:45:16 PM »

Yes, you need cap for each input.  Please connect them with shortest possible wires.
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www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope
SScnc
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« Reply #4 on: August 18, 2011, 02:54:10 PM »

How am I suppose to put 7 caps on this board with how small the terminals are?
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borisz
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« Reply #5 on: August 19, 2011, 01:23:17 AM »

One by one.
Just do it it can be done Wink
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www.poscope.com home of PoKeys USB HID, IO, USB, Ethernet controler and PoScope USB PC oscilloscope
SScnc
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« Reply #6 on: August 19, 2011, 07:58:11 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
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