sending signal to open car with microcontroller


Asked by Sep 03, 2016 at 03:38 AM

Question type: General

I am interested in a way of how to open the caar's doors with a
microcontroller device's extension hardware (I have an Arduino Uno Rev
3). I know that the key can do it as well but I want to program things. The
frequency of the signal is 433.92 MHz and the modulation is FM and AM.
Therefore I need a device (a hardware that can be connected to the
microcontroller) that can emmit/send and receive signals with this certain
wave's frequency.

It is to be mentioned that, for me, it is not the most important thing to finally
get to open the vehicle (the central locking system) but to work with it and
to do experiments and to read what the key sends (this is actually the most
important thing).

Can you recommend a hardware that can read 433 MHz signals ? Are
there differences among them?

I want to express my interest into that I want to receive the signal that is
sent by the remote key.

(edit) Later on, I can try to get some useful data out of the signal.

But, for the beginning, where do I know that all the remote keys work with
the same method (I refer to this Wikipedia article: method of modulation).
And this is what I meant with FM (frequency modulation) as an example.

By the way, ATA5811( sounds
really good - I read the data sheet and it can use both ASK and FSK
(modulation). How can I find out, what my car key uses (there are so many
paramters!) ?

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