Hello, I am trying to clone my garage door's remote. I managed to make a remote for a friend of mine using one of those pretty popular and cheap 433mhz modules.
My garage door works on a different frequency though: 30.9000 Mhz. I tried googling for a module similar to the 433 Mhz one but didn't have any success. If it's possible I would like to make a sort of universal remote which works on multiple frequencies so that I can use it to open my garage door and communicate with other home devices on the 433Mhz band. Has anyone done something like this? Where should I start from? I remember as a kid playing with rc cars I used to switch these crystals on the remote and the car to change frequency, maybe I could build something similar with an Arduino?
tobiabocchi:
I remember as a kid playing with rc cars I used to switch these crystals on the remote and the car to change frequency, maybe I could build something similar with an Arduino?
Sure you can switch frequencies like that, when the frequency changes are small, such as for the frequencies for AM model control in Mhz;
26.975 Black
26.995Brown
27.020Brown/Red
etc.
The other tuned circuits in a typical remote control, antenna matching for instance, will be very different for 30Mhz and 433Mhz.
Hello srnet and thank you for your response,
Which modules would I need to buy to do so?
Do you know of any transmitter/transceiver which work on a wide range of frequency and is easy to use with arduino?
I would like to keep the project as simple as possible and also be able to communicate on as many frequencies as possible.
It is a generic fixed code 30.9mhz remote, I am able to record the code using sdr and audacity, but I am not able to reproduce it through Arduino, I don't want to buy a remote but I'd like to build my own instead
Yes it's pretty old... But still nobody helped me with the parts I need for this project, how would you build it? Which components would you use? Can you link them so I can buy them and start working at it?
That is not what I want to do. I want to build a remote to communicate on the 30.9Mhz band using Arduino. Possibly being able of doing so on the 433Mhz band simultaneously.
Maybe I could use 2 different transmitter modules?
One for the 30.9Mhz and the one I already have for the 433Mhz.
Do you have any advice for the first one? I could not find one on the internet
Yes, you will need two different transmitter modules.
These days, I wonder if it is legal to sell or use something working at 30.9 MHz, but 27 MHz hobby RC (or civilian walkie talkie) transmitters and receivers are fine, and still around.
I think you're going to have to either find a potentially expensive SDR type solution, or else build an oscillator yourself. I see that 30.875MHz crystals are readily available. You will likely find a simple circuit if you search for amateur radio ideas for 10-metre band oscillator circuits.
tobiabocchi:
That is not what I want to do. I want to build a remote to communicate on the 30.9Mhz band using Arduino. Possibly being able of doing so on the 433Mhz band simultaneously.
Please understand - the 30.9Mhz system is a "dead duck". The garage door opener has terminals to connect a pushbutton, you just use another remote control receiver that operates on the 433 MHz band which has a relay to connect to the terminals on the door opener.
This is exactly what I have done to replace old and absurdly expensive to replace (and bulky) remote controls.
Thanks to everybody who replied but still nobody gave me the help I am looking for, let me reformulate my question:
I want to build a device using Arduino capable of sending a fixed binary code on the 30.9 Mhz band either by buying a transmitter/transceiver which I couldn't find (if you can link one that would be awesome) or by building one using the crystal I linked above in a previous post (which I have no idea how to use).
I don't want to seem rude or unrespectful but if you are going to say "just replace it" or "use rolling code on a different frequency" please do not bother to respond because that is not what I'd like to do.
Thank you in advance for your help!
The garage door opener has terminals to connect a pushbutton, you just use another remote control receiver that operates on the 433 MHz band which has a relay to connect to the terminals on the door opener.