Key Fob Design Help

[ctravis1]

Hi
Would it be possible for someone to send me a circuit diagram of a key fob please with a lock and unlock feature. The same as what you get on most central locking cars.
Thanks
Chris

 

[blueroomelectronics]

You can buy them at your dealership. They usually have a rotating encryption such as KeeLoq
KeeLoq - Wikipedia, the free encyclopedia

 

[ctravis1]

sorry i don't need another key fob for my car. I just need a circuit diagram for one i'm designing something that requires it and so need the circuit diagram so i can have them made. Help appreciated
thanks

 

[blueroomelectronics]

What range? Encrypted? How many buttons?

 

[ctravis1]

about 10 metres, encrypted and with two buttons lock/unlock

 

[ctravis1]

sorry lets say 15-20 metres

 

[Nigel Goodwin]

You can buy them at quite reasonable cost at most electronics suppliers.

For an example, look here
modules&source=15

 

[Pommie]

Here you go, Clicky. Complete design with schematic and code.

Mike.

 

[ctravis1]

Another Quick Question

Hi there,
The answer been provided so far have been of much use, many thanks,

I'm just a little stuck so far with the info so far because I'm re creating a central locking system for a car as part of my GCSE coursework, and I've got the Key Fob which can be programmed to my desire, with a 'Lock' and 'Unlock' button, and the section Im stuck on is the reciver part for the wireless link.. would it be possible for someone to send me a link to a Schematic Diagram?

many thanks

 

[Nigel Goodwin]

You buy the receiver, just as you buy the transmitter - UHF circuits are difficult to build as layout is very critical.