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Inside Ping))) - Like Ultrasonic Senders Receivers      ...     9297 Views
Author's name: weRbots       

40 kHz get used to it.

It`s the frequency of the ultrasonic transducers available to computer builders.

They operate simply enough, but without some trickery, they will receive their own output with no hope of getting the bounced signals back.

There are two types of these, transmitters/receivers and transducers meaning they transmit and receive through the same port. When you tear a receiver apart, you see no difference between it and the transmitter. I am not sure what the difference is, although my testing shows the receivers seem to be more sensitive. I guess that`s just magic.

I`m playing around with these things, creating 40kHz generators - experimenting with how hard you can drive one, and playing around with the most hardy amplifiers I can.

The first steps are to get to know the ultrasonic transducer, this presentation is all about just "getting" inside the transducer - which involves decapitation and dissection of a couple of these things. "For the good of all!"
Target Ultrasonic Transducers     
One of these is a transducer, bills itself as being both a transmitter and a receiver it`s the plastic version, the other is the more recognizable silver with mesh covering device.

We will look under the hood of both.

Perhaps this will reduce the mystery around ultrasonic transducers so you can repair some you have lying around, or even roll your own.
Open the door     
Here we see the first step. What we don`t see is how I rolled a pair of needle-nose pliers of the small soft-metal "can" which holds the transducer.

It probably looks just like you suspected.
All Inside     
There is the outer can, a sleeve to hold the metal mesh (screen door) in place, and the real power, the innards of the ultrasonic transducer on it`s own little platform in the middle of everything. On a cushion of always soft grout. That`s your shock mount!
Inside the Plastic     
Simply pry off the plastic cover. It could break, but seems unlikely. Note, on this plastic model, there is a whole potting compound gluing the whole thing together, so you won`t replace any parts on this board.

When one of these dies, it will spend the rest of it`s life getting recycled. Has nasty metals inside there, put it in special recycling for batteries and the like.
Disturbing the piezo-electric ultrasonic transducer     
I simply rip this one apart.

It`s the tiny vibrating center piece that is the core of every ultrasonic transmitter and receiver.

Whether you have a two-piece unit like the Famous Ping))) Ultrasound unit from Parallax or the cheapest of the cheap twins in the classic four pin SRF-04 which you can get five for twenty five bucks on e-bay (one of them still works, and I put `em through hell with my robot experiments.)
I`m showing off the riches in my parts bin     
Here`s a brand new one sitting beside the now departed other one. I`m simply flaunting my riches, yes, I can afford to blow $25 on a new one, which will find it`s way into another bot.

The point really is, that the core of this unit, for $25USD or the Parallax unit for $30USD, you are talking about the same core.

The piezo electric inner core. Specialized to operate at 40 kHz with a little dish in the center to focus the 40kHz ultrasound from the vibrating (piezo effect) quartz crystal vibrating it from below.

Remember I told you, you`d know about 40kHz, if nothing else.
For the merely curious     
You may never rip one of these apart, and that`s OK, that is why I put this project up on CwhatIcanDo.

Just so you have an idea, here is the tiny little 40kHz vibrational device leaning on it`s big cousin, the piezo sounder that operates in the normal hearable audio range.

The little guy run`s faster, being specialized to peak at 40kHz, the big one can put out somewhat melodious tones from around 500 to the top of normal hearing around 20kHz.

Some size difference huh?
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No parts list with this project. Scan the 'Junkbox Reviewer' below! Find projects by clicking on their parts. Got something in your junkbox? Here's your spot to find something fun to make or build!

 

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