low cost wireless communication....

hi....

i want to establish a low cost wireless communication between pic microcontroller and pc.. which is the best and cheap solution.. itried with rf communication... some times nose affected in communication.. The pc receiving some special charactors in between the datas....

Thanking You

For error free signal reception use zigbee/bluetooth or any other reliable techniques other than low cost RF modules .
I think ZigBee modules are cheap and easy to get.

Good luck.

Hii,

How about using TLP 433.92A ( for transmitter) and RLP 433.92 A (for receiver). I

think this is very cheap module which cost about 10-15USD. If you want to build Half

Duplex communication you need 2 TLP and 2 RLP for making Tranceiver. When I tried

this modul at first, sometimes it send weird character because of the noise. But after

some of modification and grounding and also low baudrate setting the noise can

reduce. Check this link, I also learn from this ( but I recommend you not use

bread board for experiment cause it make much noise and the receiver keep get

the weird data eventhough we not send the data).

http://winavr.scienceprog.com/examp...433-rf-modules-with-avr-microcontrollers.html

Hi, i want to know how did you reduce that noise.because i have having the same problem with my circuit.i am using tlp 434 and rlp 434 to send and receive data between two micro controllers but i receive weird characters in between original data.what modifications you did for reducing noise and what kind of grounding is required?? please reply me as soon as possible..

asad_ali_90 said:

Hi, i want to know how did you reduce that noise.because i have having the same problem with my circuit.i am using tlp 434 and rlp 434 to send and receive data between two micro controllers but i receive weird characters in between original data.what modifications you did for reducing noise and what kind of grounding is required?? please reply me as soon as possible..

Click to expand...

Hi,

With those little ASK type modules you need to use an Encoding method between the two otherwise you just pick up everything on the planet!

Search this forum under 'Manchester' encoding which seems the way to do it.

If using Pic assembler you can use this code as I did, works well.
http://www.winpicprog.co.uk/pic_tutorial12.htm

how about the nRF24L01+ ? complete modules seems very cheap...

soinarose said:

hi....

i want to establish a low cost wireless communication between pic microcontroller and pc.. which is the best and cheap solution.. itried with rf communication... some times nose affected in communication.. The pc receiving some special charactors in between the datas....

Thanking You

Click to expand...

Hello,
Either choose Cheap and noisy(which can be filtered using proper code), or expensive, plug n play, less coding(Easy) Rf modules:
Cheap :
No introduction required to these : 433 MHz Rf Modules price range 250Rs. - 350Rs.(One Rx-Tx pair)
So for both sides data transmission and reception 2 RX-Tx pair cost will be 500Rs-700Rs + 160Rs(If encoder/decoder Ic's are used) = 660Rs-860Rs.

Coding: As receiver keeps on receiving rf signals(even when transmitter is not transmitting), so filtering is must, data needs to be encode/decode properly to achieve proper data transmission..Generally two methods are used:
1. Using Encoder/Decoder IC's - HT12D/HT12E, etc. add price 60-80 Rs
2. Manchester coding
3. Make your own encoding/decoding Filtering Codes.. Add verification bits.

- HT12D/HT12E (decoder & Encoder Ic's) to interface these modules with microcontroller,
Regarding Link: http://www.rentron.com/rf_remote_control.htm
Disadvantages : not very efficient, baud rates are very low.
-Menchester coding : Best way to use these pairs. No extra Ic's are required.
Regarding Links:
Understanding Manchester code : http://en.wikipedia.org/wiki/Manchester_code
Related sites and Codes :
1. http://bertrik.sikken.nl/433mhz/index.html
2. **broken link removed**
3. http://www.picbasic.co.uk/forum/showthread.php?t=198&s=&highlight=Manchester

Helpful Links-

Expensive :
XBee Wireless Modules, CC2500 Wireless Modules and many more..
Cost: XBee - One Transceiver pair 2800Rs.
CC2500 - One Transceiver pair 1400Rs.
Good Range, Data rate, Baud Rate, Secure Transmission, no noise.
Links : **broken link removed**
2. **broken link removed**
3. **broken link removed**
4. http://www.ilabsindia.com/product/cc-module/
5. **broken link removed**

a. http://kolry.blogspot.in/2010/06/avr-atmega8l-cc2500.html
b. **broken link removed**

- http://www.codeproject.com/Articles/55864/Remote-control-based-on-c8051-with-433MHz-radio-mo

Good Luck

After reading your post again I realised that you need data transmission between pc and microcontroller, I'll suggest you to go for Bluetooth modules :
https://www.edaboard.com/threads/135659/
**broken link removed**
http://vshamu.wordpress.com/2011/03/20/bluetooth-module-interfacing-with-microcontroller/

Sure-electronics (I'm not affiliated to but *I like their stuff", do some MicroChip (ExplorerBoard16 based) MRF24J wifi "transcievers", $23 for a pair (I got 4 by accident! )
**broken link removed**

I can say "they work, 9600-serial-comms, straight out the box", and I've got them tied into an LED matrix controller and BIG-LED-PWM controller, a PC, FTDI etc, they are cool indeed...

BUT, based on the MicroChip libraries and explorer16 examples, they are re-programmable as all-sorts, 2.4ghz *fun*.! My tinkering fun for later is "changing defined-packet-header-values" (xoring any bits of *all* the packet's header, or even encrytping the full packet with any "shared" number) can make "virtually un-break-into-able" comms, but I've just left mine "Stock", I must admit!

COOL,
NEAL

You keep replying in a two year old post , I don't see the point...
The post that reopened this thread is post #4 and that post doesn't ask for a module recommendation.

Alex