fixed code 433mhz remote

hi firends,

as usual i am here for some basic questions, i want to link a rf remote control to my existing project... and i have tried to Google "RF MHz" and lots of other queries for the purpose... but couldn't get the very basic answers to questions that arose in my mind....

do any one have a basic tutorial or link to it for this purpose?

my needs are a system capable of learning a number of remotes,
the remote just provides a pulse on the relevant pin,
2 channel

what i need help on is....

1 what would be the best approach?[ using decoder chips or uc]
2. how do i link the remotes,[software]
3.is it that i need to use the Rx TX module and connect it to avr's Rx/TX and use the data from udr register, ... or are there any intermediate stages, specially in Manchester coding and decoding....

sorry for asking some weired questions but thats how i am going to understand it...
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ok, i had some reading
but still have some issues?

do i have to give each transmitter a unique adress? answer seems to be yes, so this has to be done in software?.....
and how would i make the reciever be programed for a specific remote/transmitter... should it be like that when the learn/program button is pressed the reciever recieves the code that is transmitted by the transmitter and saves the code[fixed code] in eeprom? and then after word respond to that remote only?

and for adding another remote simmilar procedure is done but now durring validation the reciever compares code with all stored codes and after that it validates it or make it in valid?


basically i need the algorithm for such remote.... can any one help me regarding that ...? as far as the modules are considered i dont have problems in them.... they are just a link... other than that the whole algorithm of using multiple remotes and their addressing that is required...


sorry for being so confusing.....
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i need fixed code , further more what i am stuck in is what approach should i use to lock transmitter to a receiver...? how is addressing used? and how is a remote locked to a receiver ....

thats where i cant go ahead.... i want a receiver that can be locked to more than 1 remote...

How should i do it?

whether i should give each remote its specific address in the packet it transmits and then on match match it with that on receiver eeprom of a avr?

Hello,

1. For wireless remote control, there is usually a transmitter connecting to the device and then a receiver connecting to the terminal, usually a PC or MCU. This is point-to -point transmission. The transmitter and the receiver is just to instead the previous RS-232 or RS-485 Wired cable.

2. If you have need multi-points to point transmission, you can ask to set ID for the modules by software. So the receiver will identify data from transmitted from different modules. They do that by port transmission protocol setting. The modules manufacture will give you software or some port Comand to realise that.

Hope this helps!

well i need the second type of commnication...

as you said it can be done in software, can you guide me how we can do it in software and what is port protocol?...

my need is to have reciever that can be programed to work with a number of remote controls, .. i mean a single reciever can be programmed to differnt recievers and all can work simultaneously...

now what my idea is that i would make different remotes with random adresses [in software that would be sent in the packets]... and at the reciever i would put a pushbutton to the microcontroller... when this PB is pressed the avr would goto programing remote mode...
now in this mode it would wait for any rf signal from a remote it would read the fixed code if thats valid then it would go ahead to pair with it, other wise leave the programming mode

if the fixed code was valid, then it would store the adress byte in its eprom.. similarly we can add a number of remotes with diff addresses...

in the normal mode of operation when ever there iss a signal it would check the fixed code , if valid would match the recieved adress of the transmitter with all stored addresses and if matched with any one of them would consider the remote as valid....

what do you say?

Added after 1 hours 17 minutes:

can you guide me towards selection of the Tx and Rx module? i need Tx module to be small that can fit easily in a small remote ... preferably SMT

Port Communication Protocol is some data command to change or realise module's parameter setting. You do not need to set the ID, just tell you requirments to the modules provider. They will set ID for the modules before delivery and give you the command.

About TX, RX selection, there are some essential elments. That is your transmission distance, the demension, the frequency, power output

for one to more control in rf remote control systems(like use one remote control to control two or more devices), the simple way is to use fixed-code control systems like pt2262/pt2272 pair, and set the same address pins coding on both transmitters and receivers. this process is done by set the DIP switch or by soldering. if you want to use that way, maybe you want to check out the **broken link removed**, as it will help you in the calculations.

hope it helps:-D