Hi. I have a couple of car remotes. Is there any way I can detect their frequency with arduino?
Why do you need to do that? I mean, as far as I know, those frequencies are standardized. It's probably 433MHz.
ashrafmansuri:
Hi. I have a couple of car remotes. Is there any way I can detect their frequency with arduino?
You might detect the remote if you know its frequency and have a matching receiver of the same type connected to the Arduino.
Otherwise measure with an RF frequency meter or maybe look for the signals on an SDR.
lukapetko2:
Why do you need to do that? I mean, as far as I know, those frequencies are standardized. It's probably 433MHz.
Thank you for your reply.
Yeah I mean it's probably 315MHz or 433Mhz.
Which is also my confusion. Like if there is any way I can distinguish.
So, I just want which frequency arduino detected.
srnet:
You might detect the remote if you know its frequency and have a matching receiver of the same type connected to the Arduino.Otherwise measure with an RF frequency meter or maybe look for the signals on an SDR.
Thank you for your reply.
These probably operate at 315Mhz or 433MHz.
Is it possible to connect 2 receivers?
Or one receiver will do?
A receiver of one type may not even see the transmissions of another type even if the frequencies are the same.
As you just want to check what frequency it is, an SDR is the easiest way of doing this.
79galinakorczak:
this what you need, L = 1 turn loop 10cm diameter or similar
Right. So how do you want the OP to calibrate it? That goes right back to having no way to measure frequencies like that.
Is there no frequency or FCC registration number on the back?
Right. So how do you want the OP to calibrate it? =
- measure L and C , if no meter for that - L can be calculated, variable capacitor can be estimated ....
- measure know frequency Tx
- measure two unknown Tx having different frequencies...
A couple more ideas.
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Open up the transmitter (or maybe the receiver) and look at the crystal which should have markings on it that indicate the frequency.
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If there is a wire antenna on the transmitter or the car, it's length may give a clue as to the frequency. They are typically quarter wave monopoles so about 17 cm for 433 MHz or 24 cm for 315 MHz.
Some of these things use 2.4 GHz, and there may be others.
As some have suggested above, knowing the transmit carrier frequency is only part of the battle. One also has to know the modulation and coding on the signal. To reverse engineer this sort of thing (and I have), I would definitely go with an SDR approach.
What is it you hope to do with this device?
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