I bought one of the pictured Ultrasonic Distance Detectors from eBay... I thought it would be somewhat like the breakout ones used with Arduino. The problem is that there is only 2-pins for connection. Hopefully, someone sees this topic and already knows what I am getting myself into. I would like to use this distance detector for "tail gaters" driving too closely.
http://www.ebay.com/itm/261970627230
Thanks in advance,
Stievenart
I think you obviously need to purchase the remainder of the assembly to which this is part.
You could (probably) use two of these to substitute for the sensors in a HC-SR04 unit
but - what's the point?
well, not quite interchangeable.
the HC- SRo4 does not have the power to drive the single unit.
the open housing requires only a little energy. the aluminum can of the JSN-SR04T, either the fixed, or cable sensor, requires a substantial energy pulse to send the signal.
also, the aluminum has to recover and there is a time gap. the JSN version cannot reliably measure less than about 30cm distance and jumps wildly, from 100cm to 0cm and areas between.
more on this if you search this site for the JSN-SR04T
So my first suggestion remains the best.
"Why?" I thought the word "tailgater" was self-explanatory. I'll dive a little further in...
The sensor is a weather-proof automotive sensor. It is a sensor from a parking sensor, like the one seen here:
Paul__B:
I think you obviously need to purchase the remainder of the assembly to which this is part.You could (probably) use two of these to substitute for the sensors in a HC-SR04 unit
but - what's the point?
I do not wish to use an Arduino shield on the back of my vehicle. but you do have the best answer so far.
The two pins was connected to the Ultrasonic transducer itself and you need to provide the circuity to send and receive the signal.
Here is the link
http://www.underwaterrov.net/hacking-reverse-parking-sensors-with-an-arduino
Thanks Bilho!
You officially have the best answer at this point. I think this will help me on my way.
@OP + billho
You have both missed the point - the op doe's NOT have a sensor he has only half a sensor (the transmitter) 2 wires - get it. Now you need the rest of the kit.
Mark
No, that is transducer can both transmitte and receive. You only need the electronic that do that.
what the OP has is an assembly of :
a plug
wire
aluminum can
piezo element
adhesive to hold piezo element to the can
cork to prevent some of the echo
sealer to hold out the water.
in essence, all he has is a piezo element that requires a high power pulse.
reply #1 is incorrect in that you cannot swap out a high power device and put into a low power circuit.
reply #1 is correct that he has only part of a sensor.
===================
the OP does no need anything other than the full system to detect tail-gators.
"Why?" I thought the word "tailgater" was self-explanatory. I'll dive a little further in...
?????? are you talking about those folks who have parties in the parking lot of sports events and concerts ? and are looking for a back-up parking sensor, as that is the device you posted.
assuming that anything is self explanatory, well, assume is self explanatory.
can we ASSUME that the entirety of measurement is within 4 meters ? that is, anyone less than 4 meters, or about a half a car length in proximity of the rear of the vehicle.
all the sensors discussed are useless over about 4 meters. since you did the research and chose that device, can we assume you picked a proper sensor for this application ?
the APPLICATION has been totally ignored, and discussion of devices that will not work in the APPLICATION are rampant.
if you have a car behind you at less than 4 meters, you know it because you cannot see their grill in your rearview mirror.
this is a classic X/Y problem, the OP is not asking HOW to accomplish a task, but rather has made a couple incorrect assumptions, has devices that will not perform said task, and now asks us to help him make it work.
the SOLUTION, it to go back to the beginning.
WHAT SENSOR SHOULD BE USED TO DETECT TAILGATERS ?
now, detection is simple, lots of devices and none require the use of an Arduino.
that then opens the door to the question, what do you want to do with that information ?
what distance is another question.....
and, as for best answer, I think my arrogant and insulting post will not make the top 10.
dave-in-nj:
WHAT SENSOR SHOULD BE USED TO DETECT TAILGATERS ?
What sensor should be used to detect tailgaters? The kind "driving too closely."
holmes4:
@OP + billhoYou have both missed the point - the op doe's NOT have a sensor he has only half a sensor (the transmitter) 2 wires - get it. Now you need the rest of the kit.
Mark
You can use the same transducer to send and receive a pulse. My guess as to why the HC-SR04 was designed with two (identical) transducers is that the transmitter continues to vibrate for a significant time after the driving signal has stopped so it wouldn't be usable as a receive sensor until these vibrations died out. As a result one couldn't do short distance (relative to the useful range of the device) measurements.
It's kind of an interesting compromise in that the designer was clearly interested in minimizing the cost of the device, but apparently had a performance requirement that necessitated using two transducers, presumably the most expensive component on the board, rather than trying to multiplex a single transducer. This may or may not be the case for the OP's application.
dave-in-nj:
and, as for best answer, I think my arrogant and insulting post will not make the top 10.
I think it is an excellent answer 
lg, couka
stievenart:
What sensor should be used to detect tailgaters? The kind "driving too closely."
well, I would have to answer that question with a question.
we are taught in driving class that one adds a 'car length' for each 10 MPH of speed. at 10MPH, that would be about 20 feet and almost double the distance of any of the sensors heretofore mentioned.
So, my question is what is the general application ? city traffic ? highway ? and about what speeds.
I think you can get this done,
I would look at a $10 electronic measuring tape. those can do 30 feet easily !
the child in me hopes you take a big foam finger and a motor and when someone comes too close, lift that puppy into view !