Hello, I want to run ultrasonic piezzo fog with esp8266 nodemcu, is this possible?
What are the specifications for that device? What drive does it require?
Please post a link to that device & its specifications.
At a guess, I'd think it would require more power than an Arduino can provide directly - but need to see specs for an informed comment...
Indeed, ultrasonic piezzo fog - Google Search does seem to suggest more power; eg,
I made a similar project, but I'm researching whether it can be done with Nodemcu.
Dimensions: 25x1.2mm
Resonance frequency: 1.70MHz
Resonance impedance: <2 ohms
Connection factor: > 52%
Static capacity: 1800pF
Atomization volume: 380ml/hour
So you must know what the drive requirements are
So think about whether NodeMCU can meet those requirements - in particular, the drive frequency and the drive power...
It's not clear what you mean by "with NodeMCU".
The piezo device wants a higher drive voltage than can be supplied directly by NodeMCU, so there will necessarily be some additional drive electronics required*, but the oscillator bit can be done with NodeMCU.
- e.g. everything to the left of the NE555 "out" pin from the schematic in your Instructables link.
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Yes, I suppose you can replace the 555 chip with a NodeMCU, but you still need the mosfet with it's supporting parts. And a separate 12volt supply to power that mosfet circuit.
Leo..
You don't need a microcontroller to make an oscillator but it might be a handy way to experiment with optimizing the frequency.
I had an ultrasonic mist generator but I didn't build it. It was fairly high-powered. About 100W through a big transformer or power supply. I don't know anything about the driver circuit. It had a float (which I had to buy as an accessory) to keep it just-below the water surface.
The "fog" they generate doesn't really "hang" or "float" in the air very well. It goes-away and falls to the floor/ground quickly.
In my pile of parts I bought for some future project idea, I have an ultrasonic mist generator and a driver board for it. The oscillator is part of the driver board, so external control is just "on/off".
The project idea was to use it as a basis for underwater ultrasonic communications, but, like so many ideas, I haven't got around to doing anything with it, in part because the piezo device isn't normally fully immersed in the mister as I'd expected. In any case I think the piezo drive voltage is pretty high relative to microcontroller logic levels (i.e. several ten's of volts vs 3.3 or 5 V).
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