Need 1M RF to link two PIC - Electronic Circuits Projects Diagrams Free

andersonj55126 · 25th September 2006, 10:52 PM

I am looking for cheap options to link two PIC together. It needs to be wireless and to start with I am looking for using a one way link. I have looked at using 400MHz transmitter and receiver modules but I think there may be cheaper ways to do this considering it only need to transmit 1 meter. I have also looked at using ultrasonic transducers.

Any ideas?

hjames · 25th September 2006, 11:28 PM

what bandwidth? Infrared is a reasonable choice for very short range. Two things to look for are 38KHz modulated "remote control sensors", or if you need higher bandwidth, IRDA type modules.

William At MyBlueRoom · 26th September 2006, 06:18 AM

A nifty little RF coupler.

http://www.cappels.org/dproj/minmass...s_Coupler.html

akg · 26th September 2006, 06:26 AM

what is 1M , 1Megabits.?

**Nigel Goodwin** · 26th September 2006, 09:26 AM

As already suggested, you don't make your requirements at all clear! - if it is 1 mbps?, then you're living in 'fairy land'!.

Check my tutorials for both IR and radio PIC interfacing.

andersonj55126 · 26th September 2006, 03:30 PM

1 meter
10Kbit per second should be plenty, but I am open to things much slower.

Infrared is not my first choice because of line of sight issues.

**Nigel Goodwin** · 26th September 2006, 03:35 PM

Quote:

Originally Posted by andersonj55126

1 meter
10Kbit per second should be plenty

Infrared is not my first choice because of line of sight issues.

IR links are normally far slower than that - what is your application?.

If line of sight is an issue, then go for radio modules, but again your application and desired speed is an issue - because of the overheads involved.

hjames · 26th September 2006, 04:42 PM

IRDA specs go up to 4 Mbit/sec (not easy mind you), but LOS is a big requirement.

If you can make your own PCB, you can might want to use chips from this company - http://www.chipcon.com/ . The chips tend to be in the US$4-5 range and are relatively easy to use.

The longshot would be to just use magnetic coupling, RFID style. If you have a stationary unit that is attached to the wall, make a big coil and pulse out a signal. 1M seems to be reasonably close to see something like that. (Mind you the coil is going to eat up a couple watts of power). RFID stuff usually works in 10's of KHz and up...

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25th September 2006, 10:52 PM	(permalink)
andersonj55126	Need 1meter RF to link two PIC I am looking for cheap options to link two PIC together. It needs to be wireless and to start with I am looking for using a one way link. I have looked at using 400MHz transmitter and receiver modules but I think there may be cheaper ways to do this considering it only need to transmit 1 meter. I have also looked at using ultrasonic transducers. Any ideas? Last edited by andersonj55126; 26th September 2006 at 03:33 PM.

25th September 2006, 11:28 PM	(permalink)
hjames	what bandwidth? Infrared is a reasonable choice for very short range. Two things to look for are 38KHz modulated "remote control sensors", or if you need higher bandwidth, IRDA type modules.

26th September 2006, 06:18 AM	(permalink)
William At MyBlueRoom	A nifty little RF coupler. http://www.cappels.org/dproj/minmass...s_Coupler.html __________________ Bill Home of the Firefly PIC Tutor Inchworm ICD2 http://www.blueroomelectronics.com

26th September 2006, 06:26 AM	(permalink)
akg	what is 1M , 1Megabits.? __________________ Gods own Country Incredible !ndia www.flickr.com/photos/_akg/ "Give a man a fish, and he will eat for a day. Teach that man to fish, and he will eat for a lifetime."

26th September 2006, 09:26 AM	(permalink)
Nigel Goodwin	As already suggested, you don't make your requirements at all clear! - if it is 1 mbps?, then you're living in 'fairy land'!. Check my tutorials for both IR and radio PIC interfacing. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

26th September 2006, 03:30 PM	(permalink)
andersonj55126	1 meter 10Kbit per second should be plenty, but I am open to things much slower. Infrared is not my first choice because of line of sight issues. Last edited by andersonj55126; 26th September 2006 at 03:37 PM.

26th September 2006, 04:42 PM	(permalink)
hjames	IRDA specs go up to 4 Mbit/sec (not easy mind you), but LOS is a big requirement. If you can make your own PCB, you can might want to use chips from this company - http://www.chipcon.com/ . The chips tend to be in the US$4-5 range and are relatively easy to use. The longshot would be to just use magnetic coupling, RFID style. If you have a stationary unit that is attached to the wall, make a big coil and pulse out a signal. 1M seems to be reasonably close to see something like that. (Mind you the coil is going to eat up a couple watts of power). RFID stuff usually works in 10's of KHz and up...