Discussion in "PIC Microcontroller Discussion" started by    Zacky    Mar 22, 2009.
Sun Mar 22 2009, 09:33 PM
I managed to interface PC and PIC via USART. Now I want to interface both the PC and PIC via wireless using RF module. I got the 433MHz module from cytron.com. The PIC is supposed to report back to PC on its Port status via transmitter module which is connected to the TX of the PIC. The receiver module is connected to RX of PC. However, things are not working as they should. I used mikroBasic software to program my PIC. Using the built-in "connection terminal", I noticed that PC is picking up unwanted signals. How can I stop the PC from picking the unwanted signal? I'm cracking my head for the past 1week trying all sorts of programming method to filter it. Nothing seems to work. Help me please!
Sun Mar 22 2009, 11:53 PM
What do you mean by "unwanted signals" ?
Mon Mar 23 2009, 03:52 AM
which chip u r using.....how u interface pic and pc serially and what data u want to transfer from pic to pc
Mon Mar 23 2009, 06:19 AM
which chip u r using.....how u interface pic and pc serially and what data u want to transfer from pic to pc
Mon Mar 23 2009, 08:36 AM
You can refer to my experiment document attached to get a clear understanding. I'm using PIC16F877A. My main problem is to connect PC and PIC with RF module.
Mon Mar 23 2009, 08:37 AM
I did the interfacing via USART using MAX232 level converter.

[ Edited Mon Mar 23 2009, 08:41 AM ]
Mon Mar 23 2009, 11:08 AM
Hi Zacky,

can you provide circuit of controller's connection with TX and max connection with RX.

make sure you keep them some distance apart. dont keep them closer coz that will create more noise.
Mon Mar 23 2009, 11:12 AM
Additional Q: I attached an LED to between the output of RF receiver and Gnd. I noticed the LED was constantly blinking although the transmitter is OFF. Also the blinking rate varied with different values of caps which is connected between the supply rail (i.e: +5V and GND). Does the caps plays a major role is this problem?
Mon Mar 23 2009, 11:14 AM
Hie Ajay, thanx for the tips. I mounted them on a separate breadboard. Its separated about 30cm. Is it sufficient? Here's the connection diagram.

Mon Mar 23 2009, 11:15 AM
I followed the guide on MikroBasic Manual for the diagram above.

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