Hi everyone, I'm new here and I would need some help with a little project.
I would like to use the Ultrasonic transmitter to shake/blend liquids, like Coffee or whatever.
I have three 16 mm 40 kHz transmitters like these (transmitter only, no receiver): https://i.ebayimg.com/images/g/uF0AAOSwO7hZ8EeM/s-l225.jpg
and I would like to know if they are powerful enough to do the job. I'm talking about a small amount of liquid, like an Espresso coffee or a shot of liquor.
I know there are atomizers and mist makers out there, but wanted to create something from scratch.
I know how to generate a 40 kHz wave from a post on this forum: 40KHz pwm square wave - Project Guidance - Arduino Forum
I don't actually know how to wire the Ultrasonic transducer to Arduino.
The discussion above has some hint at the and, talking about PIN 3 and GND Pin to an Oscilloscope:
"Your signal is coming out of Pin 3. Stick a 22 gauge wire in there. You'll also need a wire in one of the GND pins. Stick a 22 gauge wire in there too. Hook those two wires up to an oscilloscope and there's your wave"
Would you please help me with the wiring and also tell me if the transducer I got cold do the job?
THANK YOU VERY MUCH.
quote:
and I would like to know if they are powerful enough to do the job. I'm talking about a small amount of liquid, like an Espresso coffee or a shot of liquor.
But you neglected to tell us how much power is required. Have you tested with an ultrasonic washer?
Paul
I have three 16 mm 40 kHz transmitters like these (transmitter only, no receiver): https://i.ebayimg.com/images/g/uF0AAOSwO7hZ8EeM/s-l225.jpg
That looks rather small. But, no specs...
know there are atomizers and mist makers out there, but wanted to create something from scratch.
I've got a mist maker that would probably be overkill for what you're doing, but just as a reference point the power supply is 100 Watts (24V @ 4.17A). I don't know how much power is actually going to the transducer.
But, you'll need some sort of driver. The maximum current from an Arduino I/O pin is 40mA. 5V @ 40mA is 0.2 Watts (200mW) and I'm pretty sure that's not going to stir-up anything.
I don't know what the impedance of that thing is (a piezo is essentially a capacitance when there's no mechanical load) so I don't know how much voltage (or current) it takes to get power into it.
[u]Here is a driver circuit[/u], but without knowing the voltage/current requirements it's just a starting-point.
I know how to generate a 40 kHz wave from a post on this forum: 40KHz pwm square wave - Project Guidance - Arduino Forum
The [u]tone()[/u] function should work.
Hi, sorry for the missing infos, I thought 16 mm 40 kHz transducers were some sort of a standard.
Here are the ones i bought: https://it.aliexpress.com/item/Split-ultrasonic-transceiver-ultrasonic-sensor-ultrasonic-probe-to-2-2-yuan/32668187552.html?spm=a2g0s.9042311.0.0.op3wIa
There are some specs listed, actually I could not find a Voltage or Current. 
Anyway, the link to the driver circuit seems complicated, I mean, I don't quite figure it out, I wouldn't even know which one of the circuits shown I should go for - sorry, I'm such a fool at electronics.
Hope thedata above might be some help.
Thank you!
Many people make ultrasonic cleaners for pcb's etc - google them for an idea of power required - several hundred watts on the ones I've used.
Allan
There's a big difference in power needed to get a cup of espresso to shake at 40 kHz, and to get a sound pulse to travel through the air.
For that reason alone it will not work.
Another reason: you need a very different type of transducer shake an object than to produce sound waves in air.
