I'd like to build device which would be able to copy key fob. What would be the easiest/best approach?
More details:
My friend is running car rental company and he need some device which would be able to lock/unlock car using mobile phone (GSM module/BT module/whatever wireless). My idea is use Arduino Uno (or sth similar) and copy the key fob.
Car owner would use his key fob to teach the device and then place it in car.
I'd like to avoid buying programmed key and teaching car the new key. That would be way too complicated for car owners.
a/ this is what was called a grabber and woiuld be very useful for stealing cars.
b/ with modern 'walking code' keyfobs this is far from easy
c/ most modern cars have a seperate short range RFID transponder in the keyfob, recognised by an interrogation coil round the ignition switch, so it wouldn't do you any good anyway.
Robin2:
How can you prove to us that you have a legal entitlement to do this - even if it is possible?
And what about the possibility of a thief reading the advice that is intended for you?
...R
I'm not sure what exactly you are asking for. Do you mean legal entitlement to lock car or build that type of device?
Me personally or anyone else won't have rights to do it. Car will be lock/unlock by Car Rental company. Their server will decide if you have rights to ask for lock/unlock.
Locking and unlocking should not require a keyfob. Just tap into the power door lock switches. You may need to also trigger a relay that provides power to the door locks.
STARTING the car will often require a transponder in the key. Typically, for using a remote staerter, you would take the transponder from one of the spare keys and glue it near the ignition switch. That eliminates the anti-theft feature of having a transponder key but it does allow remote starting.
johnwasser:
Locking and unlocking should not require a keyfob. Just tap into the power door lock switches. You may need to also trigger a relay that provides power to the door locks.
STARTING the car will often require a transponder in the key. Typically, for using a remote staerter, you would take the transponder from one of the spare keys and glue it near the ignition switch. That eliminates the anti-theft feature of having a transponder key but it does allow remote starting.
This would be great solution. But unfortunately I need to make it plug & play and as easily as possible.
No starting and passing IMMO is required. I need only lock/unlock. I don't want to go any further.
kanec:
I'd like to build device which would be able to copy key fob. What would be the easiest/best approach?
More details:
My friend is running car rental company and he need some device which would be able to lock/unlock car using mobile phone (GSM module/BT module/whatever wireless). My idea is use Arduino Uno (or sth similar) and copy the key fob.
Car owner would use his key fob to teach the device and then place it in car.
I'd like to avoid buying programmed key and teaching car the new key. That would be way too complicated for car owners.
Thank you very much for any help!
Assuming this was possible, do you really think it would be a good idea for the details on how to do this to be openly discussed on a public forum ?
How would you feel if someone near to you built one (from the published instructions) and used it to break into your car ?
kanec:
basically yes, I need to clone key fob with rolling code. Would you use universal key fob and clone the originall one or is there better option?
The whole point of rolling code is to prevent exactly what you are trying to do.
It has been done in the past but required a back channel attack to do it.
