Rules | Recent posts | topic RSS | Search | Register  | Log in

RF 433 remote control

 
Post new topic  Reply to topic    EDAboard.com Forum Index -> Hobby Circuits and Small Projects Problems
Author Message
auto_mitch



Joined: 14 Oct 2004
Posts: 205
Helped: 20
Post28 Aug 2007 15:49   RF 433 remote control
I am trying to build a rf remote control. I have construct the following schematics but it doesnt work. The encoder and decoder ICs are from Holtek (HT12E & HT12D) and the rf receiver,transmitter are from telecontrolli (RR3-XXX & RT4-XXX). Can u help me? i have check everything but i dont know what is going wrong.

Sorry, but you need login in to view this attachment
Back to top
electronicus



Joined: 19 Aug 2005
Posts: 168
Helped: 12
Post28 Aug 2007 17:23   Re: RF 433 remote control
The schematic is not corect. Here your are the corect Rx-Tx design.

Sorry, but you need login in to view this attachment
Back to top
auto_mitch



Joined: 14 Oct 2004
Posts: 205
Helped: 20
Post28 Aug 2007 17:43   Re: RF 433 remote control
You think that the diodes is the problem? In the following application the encoder schematic includes these diodes.
http://www.circuitcellar.com/library/print/0102/millier/millier138.pdf
Back to top
electronicus



Joined: 19 Aug 2005
Posts: 168
Helped: 12
Post29 Aug 2007 15:37   Re: RF 433 remote control
An other RX-TX project.

Sorry, but you need login in to view this attachment
Back to top
rogerynt



Joined: 06 Mar 2007
Posts: 109
Helped: 11
Post01 Sep 2007 12:48   Re: RF 433 remote control
What Transmitter do you use ? Are you sure it works at 12V ?

Rogerynt

Sorry, but you need login in to view this attachment
Back to top
electronicus



Joined: 19 Aug 2005
Posts: 168
Helped: 12
Post01 Sep 2007 17:20   Re: RF 433 remote control
The maxim voltage for RT-4 TX Module is 14v.

Sorry, but you need login in to view this attachment
Back to top
rogerynt



Joined: 06 Mar 2007
Posts: 109
Helped: 11
Post05 Sep 2007 8:12   Re: RF 433 remote control
Please capture the data.

1.) Connect probe1 to Tx data of transmitter

2.) Connect probe2 to receive data at Rx

3.) Use probe1 at trigger and make they are common gnd

4.) Capture both Tx and Rx data on scope

The possible reason is as following :

Rx switched on before receiving data so that it picked up both noise and signal. After demodulation, there were random pulses ( background random noise being amplified ) appeared before valid data arrived. As the decoder could not distinguish whether these ramdom pulses were part of the code or not. The decoder will decode whatever it received therefore it treated the random pulses as part the the code and hence wrong output.

Rogerynt
Back to top
halee awan



Joined: 08 Apr 2006
Posts: 92
Post03 Jan 2008 10:14   Re: RF 433 remote control
hi auto mitch
i have also made the same project
i am using 892051
that give the serial data to TX (RTF3 okwelectronics)
and on the Receiver end i reciev data from RX (RRF1 okwelectronics) and direct it to 892051 that direct it to pc rs 232 after some manipulation ............
i monitor the rx data on the hyp terminal but
auto mitch i dont know what is going wrong that the receiver doesnt receive any data packet ,after some time i saw on hyp terminal raw data, not exact packet that was transmiited by the TX
auto mitch i want to get help about this if u have captured
Back to top
zawmintun1



Joined: 21 Nov 2007
Posts: 44
Post01 May 2008 13:07   RF 433 remote control
Thank a lot
Back to top
pranam77



Joined: 22 Apr 2008
Posts: 65
Helped: 4
Location: The heaven
Post12 Jun 2008 10:12   Re: RF 433 remote control
Ready to use Assembled and tested 4channel remote kits using HT12's are vaillable In india at "www.united77.com/projects.htm"
Back to top
Post new topic  Reply to topic    EDAboard.com Forum Index -> Hobby Circuits and Small Projects Problems
Page 1 of 1 All times are GMT + 2 Hours


Abuse
Administrator
Moderators
topic RSS 
sitemap