PIC Input Wire Length

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Suraj143

Active Member

• Oct 29, 2009

• #1

I have a problem with this arrangement.
The switch is placed 15M ahead. I used a CAT5 cable. The problem is sometimes it will make the PIC input low without pressing the switch.

Any other method to overcome this?

 

Attachments

• Input Length.PNG

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ericgibbs

Well-Known Member

Most Helpful Member

• Oct 29, 2009

• #2

Suraj143 said:

I have a problem with this arrangement.
The switch is placed 15M ahead. I used a CAT5 cable. The problem is sometimes it will make the PIC input low without pressing the switch.

Any other method to overcome this?

Click to expand...

hi,
Use a 1K resistor in place of the 10K.

 

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Diver300

Well-Known Member

Most Helpful Member

• Oct 29, 2009

• #3

Add a capacitor on the input of the PIC, or a debounce routine in the program.

 

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Russ Hensel

New Member

• Oct 29, 2009

• #4

Also make sure the two lead you are using are part of a twisted pair.

 

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Suraj143

Active Member

• Oct 30, 2009

• #5

Hi I modified the circuit is this good?

 

Attachments

• Buffer.PNG

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colin55

Well-Known Member

• Oct 30, 2009

• #6

You need to add a resistor (10k to 100k) across the 1u to make sure it discharges. You don't really need the transistor. Just use a 1k to 10k and 1u in parallel.

 

Last edited: Oct 30, 2009