$12 Waterproof Ultrasonic Sensor
erco
Posts: 20,257
http://www.ebay.com/itm/360857671987
Now you build your own ultrasonic bumpers. Mine just arrived today with lots of other goodies, won't have a chance to test for a while. 5V, single transducer, same pinout as a 4-pin HC-SR04 (those are just $1.15 now)
I'll report back after I test accuracy, and if it works in 1-pin mode (like a PING). And waterproofness.
Of course, the waterproof one costs over ten times what the cheapie does. Depending on how long the cheapie lasts, you could let it fail and replace it ten times and still come out ahead.
Now you build your own ultrasonic bumpers. Mine just arrived today with lots of other goodies, won't have a chance to test for a while. 5V, single transducer, same pinout as a 4-pin HC-SR04 (those are just $1.15 now)
I'll report back after I test accuracy, and if it works in 1-pin mode (like a PING). And waterproofness.
Of course, the waterproof one costs over ten times what the cheapie does. Depending on how long the cheapie lasts, you could let it fail and replace it ten times and still come out ahead.
Comments
I'm in for two.
This thing showed up as I was looking at the water proof versions.
I thought it might look cool on a robot but I doubt it works like a normal ultrasound sensor. I think it just detects a change in the echo and sets a pin high. It doesn't look like it would give useful distance information.
I'll stick with the water proof ones for now.
You're putty in my hands, Dawg!
I actually ordered this for a bona fide new toy concept. Now that I'm a freelance inventor, you wouldn't believe the crazy ideas that pop into my head at 3 AM.
Has anyone actually tried the screen door in a submarine idea yet?
You are the accepted centre of expertise in economic sensor procurement.
Please could you see if you can locate an underwater ultrasonic sensor.
I know there are many fish finder modules, and there are top-end units, but I really want a low cost, basic SR04 type module that I can incorporate in underwater robots (similar to what you do in above ground robots).
Many thanks.
-Phil
It will be fully submerged at times, so every thing has to be covered and sealed.
The 'Ping People Detector' on my porch steps, works through the rain drops, I've only used it to detect peoples and critters within 8 feet or so.
I don't use it to measure distance in this application, It only checks to see if something is there, It works rain or shine, 24/7,
Sitting under the edge of an awning, just staring down at the steps, always reporting its farthest distance reading to the Prop,
until something comes up the steps, then..The laser system targets and eliminates the annoyance..
Well, actually, it just "bings" a piezo buzzer, and turns on an LED for 30 seconds or so.
Anyway, it works as well in the rain as it does in the sunshine. It's not in a place where it will see a sheet of water, only rain drops, which it seems to ignore.
-Tommy
I need one of these for so many reasons.
One is so when our substitute UPS driver practices his Ninja stealth deliveries, I'll know when the package has arrived even if the Brown Ninja doesn't ring the doorbell.
Now you have me wanting to make a submersible tester for this sensor and try it in a pool, dangit!
Not sure how the ultrasonic signal will propagate in water. The speed of sound in water is ~4.4 times faster than air, so that must be accounted for.
http://en.wikipedia.org/wiki/Speed_of_sound#Water
What can Brown and FedEx do for you today?
http://www.komonews.com/news/local/Video-shows-UPS-driver-kicking-and-throwing-packages-268692772.html
http://www.inquisitr.com/170692/fedex-driver-throws-flat-screen-tv-over-fence/
My usual UPS and FedEx drivers are great but I think when there's a substitute who doesn't know the area as well, they take shortcuts and don't ring the doorbell. This is very irritating since I have doorbells all over the house just to make sure I know when deliveries are made.
I don't think they use ultrasound underwater. A nice audible "ping" works nicely (don't you guys watch submarine movies?).
https://www.youtube.com/watch?v=HV1blh5H_aI#t=44
Jump to 44 seconds... You thought I was just joshin'! And how come Youtube "jump to 44 seconds" never works anymore?
But then I read THIS and decided to never go in a public pool again.
Eeewww.
The sensors arrived today. I guess the overall time isn't longer than many ebay purchases but I was surprised they waited 12 days from the date of purchase before shipping the sensors.
The Brown Ninja will no longer be able to sneak packages up to my door without being spotted.
Isn't that what the PIR is designed for?
PIR sensors don't work well outside.
http://www.ebay.com/itm/Ultrasonic-Module-Distance-Measuring-Transducer-Sensor-Waterproof-DC-5V-Voltage/231458217811
The back of the "probe" has an up arrow, I wonder how important that is?
I think I will try one out and see.
The product feature list has some things I may, or may not need... number 5 in particular seems a bit awkward...but number 4 could be helpful if number 5 goes wrong...
Product Features:
1, small size, easy to use;
2, low voltage, low power consumption;
3, high accuracy;
4, strong anti-jamming;
5, integrated with wire enclosed waterproof probe, suitable for wet, harsh measurement occasions.
-Tommy
After trouble with customs thinking the package contained a forbidden Lithium battery
I want to use it for measuring the water level in a cistern (discussed many times - not a good environment for the normal PING(( )
I wanted to connect it to a 3.3V processor - yes the Prop - and the ESP8266 ;-) as a wireless IoT node ...
and here comes my questions:
Luckily I measured the voltage at the trigger pin, before connection -
5 volts !!!
seems to be a pullup of some sort.
the ESP is described as beeing sensitive to overvoltage,
so I don'T want a direct connection.
1. Do you see the same pullup in your sensors - or is my sensor broken?
did expect the trigger being an INPUT not pulled up ...
2. there is a red LED that is off at boot and goes on at trigger - but never off again.
I couldn't find a schema or description - but to save power don't need / want it.
do you have the LED as well? any idea of function ?
3. schema / docu anybody ??
of course I can simply use a transistor to do the pull down insolation and desolder the LED
as a next step.
4. do you have experience about range / accuracy
thanks
Markus MJB
Some preliminary testing with a regular Ping((( , held close to the water, made my Koi fish swim away from the test platform every time I Pinged((( them.
So I abandoned that part of project 'Count the Fish'...
Wish I could help, Hopefully someone else has purchased one of these, and will have more info for you.
-Tommy
Markus, the eBay ad says "Blind 25cm". Is that the minimum detection distance ?
And I wanted a sensor that had lesser minimum distance and to my surprise I found out there is a new sensor in town.
It has 2 transducers instead of 1 so it has smaller minimum detection distance as compared to JSN SR04T.
Also its main board is not exposed like the JSN SR04T since it looks properly sealed and is therefore fully waterproof.
https://ebay.com/itm/253978673298