PIC Input Wire Length - Electronic Circuits Projects Diagrams Free

Suraj143 · 29th October 2009, 02:06 PM

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?

ericgibbs · 29th October 2009, 02:15 PM

Quote:

Originally Posted by Suraj143

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?

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

Diver300 · 29th October 2009, 10:26 PM

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

Russ Hensel · 29th October 2009, 11:56 PM

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

Suraj143 · 30th October 2009, 11:26 AM

Hi I modified the circuit is this good?

colin55 · 30th October 2009, 08:39 PM

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.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar
Title	Starter	Forum	Replies	Latest
Pic Output - cable length	Wp100	Micro Controllers	1	10th October 2009 12:21 PM
Noisy Long Wire effect my Microcontroller Digital input	ksaomar	Electronic Projects Design/Ideas/Reviews	12	3rd May 2009 07:07 AM
PIC instructions length	french_student	Micro Controllers	6	19th December 2003 01:58 PM
Approx. resistance, cap, inductance of length of wire	bigdog	General Electronics Chat	2	12th March 2003 11:16 PM
PIC through live wire communication	etix6x2000	Micro Controllers	3	11th March 2003 05:18 PM

29th October 2009, 02:06 PM	#1
Suraj143	PIC Input Wire Length 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? Attached Thumbnails

29th October 2009, 10:26 PM	#3
Diver300	Add a capacitor on the input of the PIC, or a debounce routine in the program. __________________ http://nottheboss.wordpress.com/

29th October 2009, 11:56 PM	#4
Russ Hensel	Also make sure the two lead you are using are part of a twisted pair.

30th October 2009, 11:26 AM	#5
Suraj143	Hi I modified the circuit is this good? Attached Thumbnails

30th October 2009, 08:39 PM	#6
colin55	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 by colin55; 30th October 2009 at 08:41 PM.