Eric- Now you have to explain to us how you did that. Would be nice to have fobs powered by lithium batteries instead of the alkalines we now have. Not that I want to buy any $700 F430 keys.
Did you put the EEPROM from one of the old fobs into the F430 key or just write the EEPROM contents to the existing F430 EEPROM?
+1 Eric, would like to know more about what you've just mentionned
Do you mean that with the F430 key, you're controlling the Capristo valve opening device (or another simular unit) instead of using the Capristo provided remote?
Well, I have been able to buy a F430 key from ebay for a reasonable price. I bought it mainly for the look of the key which is much much better than the OEM 360 key.
The remote in the F430 key is much modern than the old fobs, but also much simpler with only a few components. The main one is a HCS200 integrated circuit from Microchip which allows transmission encryption with the KeeLoq algorithm. The transmitted bit sequence contains a fixed part and an encrypted (rolling) part.
Those HCS circuits, transmitters and receivers, need to be programmed with a specific key chosen by each user or manufacturer. Ferrari put its own key in the circuit, so it is almost impossible to build a receiver able to decypher the transmitted sequence without knowing the key.
My first idea was to build a receiver able to recognise the fixed sequence. I don't need a high degree of protection and security for valve opening
but it would have been too much time consuming.
Finally, I did prefer to replace the original "Ferrari" HCS 200, by a HCS 300 taken from a remote manufactured by Aurel (TELECOMM. 1 CANAL AUREL HCS300 - Elecdif.com
). The big advantage is that now the receiver is fairly simple, Aurel is manufacturing a suitable small KeeLoq receiver (RX-4M-HCS : RECEPTEUR HAUTE SENSIBILITE DECODEUR HCS - Elecdif.com
) able to drive a relay, and which can be paired with the remote.
I have now a Ferrari key, with an embeded Aurel circuit, wich can command the exhaust valves through a custom receiver based on an Aurel module.