I am trying to interface Arduino with a parking sensor I bought from E-BAY;http://www.ebay.com/itm/Car-Reverse-Backup-Radar-System-4-Parking-Sensors-LED-Display-BLACK-USA-SELLER-/201012065960?_trksid=p2047675.l2557&ssPageName=STRK%3AMEWNX%3AIT&nma=true&si=Pxa0iNIBogy2s4W2bSCJlpmKhSo%253D&orig_cvip=true&rt=nc
Its a 4-sensor parking assist device, I would like to hack the sensor data from the module. It is a central module, 4 sensors and an LED display. 4 sensors with two wires is somehow processed to a "data" wire that connects to a LED display to the module. I have researched the project so far by finding 2 other blog's on the internet for the same setup, however - the DATA waveform on THEIR modules output 24 data bits, and appear to follow a standard generic binary decoding method.
(I've attached a scope capture from the data wire).
The two large pulses in the begin of the transmission appear to be constant, however the 21 pulses of data that follow appear to change when a sensor is moved. Does anyone have experience decrypting this information and can give some advice ?