SECRETS
MY GATE OPENER
HAS TOLD ME
AKA: SDRI third (and fourth) meetup!
JUNE 2016
Software Defined Radio Israel
$ git clone https://github.com/raziele/MyGateOpenerIN THIS MEETUP, WE WILL:
- Locate and record signal
- Perform visual analysis
- DSP: Filter, (Demodulate), and synchronize signal
- Extract code
Copyright © 2015-2016 Robert W. Stewart, Kenneth W. Barlee, Dale S.W. Atkinson, and Louise H. Crockett
All rights reserved.
STEP 1:
LOCATING SIGNAL'S FREQUENCY
Unlicensed frequency bands
STEP 2:
RECORDING
SampleRate \cdot 2 = 2\cdot 10^{6}[\frac{samples}{second}] \cdot 2 = 4\cdot 10^{6} [\frac{samples}{second}
4\cdot 10^{6} [\frac{samples}{second}]\cdot 32[bit-float32]=128\cdot 10^{6}[\frac{bit}{second}]=16 [\frac{Mbyte}{sec}]
433.5MHz
/14.4
Padding to F32
STEP 3:
VISUAL ANALYSIS
1 1 1 1 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 1 1 0 0 1 0 0 1 0
ASK|2 levels =OOK
STEP 4:
SIGNAL PROCESSING
Time domain
Frequency domain
STEP 5:
CODE EXTRACTION
WHAT CAN WE DO WITH AN EXTRACTED CODE?
A CONNECTED GATE?
WHAT CAN YOU DO
WHEN YOU CAN:
EXTRACT CODE
(LEGALLY) TRANSMIT CODE?
Secrets my gate opener has told me
By raziele
Secrets my gate opener has told me
SDRI third meetup
