need help with rf based remote control

[nipun]

im trying to make a remote control with atmega16 and a standard tx/rx rf module(333 MHz).im using usart to send and recieve data to these rf modules at 200 baud rate.problem is its not working properly ,sometimes its giving output and sometimes its giving a different o/p.problem is not wth µc simulation is showing perfect results.what can be the problem.plz help

 

[vibeeshpv]

wot type of rf module u using.also there may be some problem of dcshifting..use an antena...and try it .

 

[nipun]

its ask based rx/tx pair,thx for ur help

 

[budhy]

Do you use FSK?

 

[arnab.bhaumik]

hi
some months ago i developed a remote control using tx rx pair,


first of all these modules are damm slow, those modules are contains a 2222 encoder ic (in tx part)and anoter decoder ic in the receiver module.


data transfer rate are damm slow . you can check it . first send a byte from transmitter and after that wait for almost 300ms(test case) then send a 0xff byte
or 0x00 byte. check that at receiver side using a scope. after some sampling you will get the idea of timing.

also these modules are one is latch type and another is momentary.

so also check that ( 2222l for latch and 2222m for momentary) and program accordingly



arnab/vu2bpw

 

[nipun]

i use ask.i know these r slow so i use it around 200 baud rate.i need it for remote control only so its ok,but the problem is it some times works n some times doesnt,is there a problem of interference?