Hi,
I have a remote control for locking and unlocking car doors which transmits on the 433MHz band. I bought a cheap 433MHz rf link (actually I bought three different) on ebay, so I could have a look and feel on how I can possibly make a car lock/unlock hack in the future.
The rf links looks almost the same, and have almost the same pin-out (one of them just had to be flipped 180 degrees). This is a link to one of the products
http://www.emartee.com/product/41357/433Mhz RF Link Kit
All three act the same.
I hook up +5v and ground to the receiver and connects my oscilloscope probe to the data pin (one of the to, they're connected together). I then see a lot of noise. Compared to the output of my car remote, I don't see how it will ever be possible to decode anything with all this noise?
In the picture below, yellow waveform is the rf noise on the data pin of the rf receiver, the blue waveform is data out on the encoder chip inside car remote. As you can see, the waveforms share the same timebase time/div (is it possible to have individual?) so how is it possible to ever read anything off of this? Please help me clarify the question if you do not understand it.
I'm sitting in my lab, and as far as I know there is no other appliances or similar using this frequency band except maybe the remote light switch thing, but I removed it's batteries just to be sure.
I have a remote control for locking and unlocking car doors which transmits on the 433MHz band. I bought a cheap 433MHz rf link (actually I bought three different) on ebay, so I could have a look and feel on how I can possibly make a car lock/unlock hack in the future.
The rf links looks almost the same, and have almost the same pin-out (one of them just had to be flipped 180 degrees). This is a link to one of the products
http://www.emartee.com/product/41357/433Mhz RF Link Kit
All three act the same.
I hook up +5v and ground to the receiver and connects my oscilloscope probe to the data pin (one of the to, they're connected together). I then see a lot of noise. Compared to the output of my car remote, I don't see how it will ever be possible to decode anything with all this noise?
In the picture below, yellow waveform is the rf noise on the data pin of the rf receiver, the blue waveform is data out on the encoder chip inside car remote. As you can see, the waveforms share the same timebase time/div (is it possible to have individual?) so how is it possible to ever read anything off of this? Please help me clarify the question if you do not understand it.
I'm sitting in my lab, and as far as I know there is no other appliances or similar using this frequency band except maybe the remote light switch thing, but I removed it's batteries just to be sure.