Comments on: RF Communication Between Microcontrollers – Part III

By: Akhila

Akhila — Wed, 01 Sep 2010 14:30:54 +0000

thank you sir.

By: Avinash

Avinash — Mon, 30 Aug 2010 02:23:44 +0000

@Akhila

Why NOT ?

By: Akhila

Akhila — Sun, 29 Aug 2010 16:44:31 +0000

Sir,

I’m working on my final yr proj which is based on “Swarmbots”.I would like to employ RF communication for the same using a PIC microcontroller(16F877A).Is it possible to use the same logic as above with PIC too?..Kindly reply.

Thank you,
Akhila.

By: priyanka

priyanka — Fri, 23 Jul 2010 02:47:22 +0000

Hi,
firstly hats off to u and thanx for explaining the rf communication so elaborately….m doing my last year engg nw n interested in rf… dis article really helped a lot in clearly some of the basic concepts which i ws stuck in…u cn say m a beginner in dis field n searchin for a project application using rf communication…
thanks

By: zhaem1988

zhaem1988 — Thu, 27 May 2010 22:31:46 +0000

hi
thanks for your wonderful tutorials
are the tx &rx module in Proteus simulation program or any other program ?
because i have project and i want to simulate it before doing it
thanks

By: BISWAJIT

BISWAJIT — Thu, 27 May 2010 12:33:06 +0000

i m using crystal of 12mhz and the ubrr value is 311. my rf modules are 433mh himark made rf modules.

this is not working . tell me the prob is it mandatory to use 16mhz.and that 315 mhz rf modules?

By: chinmay

chinmay — Thu, 27 May 2010 11:14:45 +0000

hi avinash,
well i want to change the Crystal freq to 12Mhz. n i m using 315Mhz RF module. is it good to work with 12Mhz crytal n 315Mhz RF module. i know for dat i hv change few lines in the code n i can do dat. just pls tell me weather ur codes r flexible for it or nt. otherwise i m comfort to work wid your specified instruction.

By: tester

tester — Tue, 11 May 2010 14:12:19 +0000

@ Arifuddin Sheik

what was your fault? Becuase I can’t get this working. And the circuit is correct.

thanks

By: Arifuddin Sheik

Arifuddin Sheik — Sun, 02 May 2010 12:03:13 +0000

I finally got this working. [:)]

By: Avinash

Avinash — Wed, 28 Apr 2010 10:19:11 +0000

@Newbee
The files are live and easily downloadable. I tried just now!

By: newbee

newbee — Wed, 28 Apr 2010 09:38:17 +0000

Hi Avinash,

I am not able to download the following,
Complete AVR Studio Project for Tx
Complete AVR Studio Project for Rx

Is there some error or thess projects is removed?? Where can i find them alternatively if not provided on the above links?

By: Lieven

Lieven — Tue, 27 Apr 2010 16:06:11 +0000

Hello

I would like to use the same freq ,internal 16mhz and baudrate of 2400bps.

In the USART.C i found this

#include
#include
#include

#include “usart.h”

void USARTInit(uint16_t ubrrvalue)
{
//Setup q
UQFront=UQEnd=-1;

//Set Baud rate
UBRRH=(unsigned char)(ubrrvalue>>8);
UBRRL=(unsigned char)ubrrvalue;

/*Set Frame Format

Asynchronous mode
No Parity
1 StopBit
char size 8

*/
…….

do i have to change this

UBRRH=(unsigned char)(ubrrvalue>>8);
UBRRL=(unsigned char)ubrrvalue;

to this? from the formule ( ubrr = (Fosc/(16*baudrate))-1 )

UBRRH=416;
UBRRL=416;

or do i have to change more?

many thanks

By: Avinash

Avinash — Tue, 27 Apr 2010 13:50:27 +0000

@Lieven

Hello,
Yes it can work with ATmega8535. If you wanna use Internal Crystal Of MCU then you have to change the UBRR value according to the CPU Frequency and the baud rate required. All these are discussed here.

http://extremeelectronics.co.in/avr-tutorials/using-the-usart-of-avr-microcontrollers/

By: Lieven

Lieven — Tue, 27 Apr 2010 13:36:13 +0000

Hello

don’t shoot me if this is a stupid question.
But does it also work with a ATMEGA8535 (reciever) and ATMEGA16 (transmitter)??

and is there a possible way to use the internal frequantie of the MCU?

many thanks

By: hbomb

hbomb — Thu, 15 Apr 2010 00:53:20 +0000

Thanks avinash your tutorials are excellent and full of info for beginners like me

By: Uttam Dutta

Uttam Dutta — Sun, 04 Apr 2010 09:04:24 +0000

I want to know what has to be done for communication between 200 to 300 meters with different obstacales in between and other RF noise signal.
regards,
Uttam

By: Arifuddin Sheik

Arifuddin Sheik — Mon, 15 Mar 2010 07:41:08 +0000

Sir, I build the whole setup as shown in circuit. I am using ATmega 32 and using your Programmer, I dumped the code. i adjusted fuse bits as given. I tested Tx pin using LED. its working. I think the problem is in receiving side. I used 16MHZ crystal. I am not getting the data in receiver. I tried all ways. I connected the tx pin from transmitter to rx pin of receiver. Please help me to find out the solution.

By: Shashi Jain

Shashi Jain — Sat, 06 Mar 2010 20:36:20 +0000

plz dont fight wid each other…k i accept my fault…
neway m not a rich person or else i would have been using readymade remote control modules…n yes it was very harsh reply from ur side…
i’m working with codevision avr becoz i got it in the workshop itself…in indore most of of the workshops r using this software…and i cant argue wid them to use low cost software so as to reduce workshop fee!!!…

n one more thing i would like to say….
not every one is as intelligent as u r!!!…

By: Avinash

Avinash — Sat, 06 Mar 2010 15:25:46 +0000

@Vivek

That was not as Harsh as the comment your about to receive !

People of No use like you uses the CRACKED software. No Company can use a CRACKED software. I never recommend any one to use CRACKED software. It like being a thief. The guys who developed CodeVision is Much Much Smarter than you are.

If no one is foolish enough to buy then the CodeVision guy must be foolish. But this is not the case, this implies that you are foolish.

Moral of the Story
Please friends never use Pirated Software. If you cannot afford to buy then Please use free alternatives. Because when you develop an embedded application its ultimate form is a commercial product. If you have learned to use a Paid software (when you were in learning phase) then you have to use that software also for any of your commercial product. And if your company supplies product through out the world( ultimate aim of any company) and you use a Cracked software, Code Vision Guys will sue you in no time !!!

So better use free software even at your learning phase(unless you are rich).

If you can buy CodeVision then its good but if you cant buy it use avr-gcc.

By: vivek

vivek — Sat, 06 Mar 2010 14:03:01 +0000

@Avinash
“Not every one is as rich as you to purchase Code Vision Compiler. I can’t recommend then to Go and Buy Rs 10,000 Compiler”

1st of all this is a very harsh and unnecessary comment. Nobody is foolish enough to “buy a Rs 10000 compiler”. People are smarter than you think. The crack for this software is not that difficult to obtain.