Ultrasonic Humidifier intensity of mist control using Arduino

Other Hardware Sensors
1

Hi,
I've got Ultrasonic Humidifier and I need to control/vary the intensity of the mist with Arduino.
Any help on this is appreciated
As an output to the transducer is an ac signal how do I control it?

2

Easiest: switch it on/off for a second or two at a time.

Does the supply voltage even make a difference for this thing?

3

Do you mean through PWM?
Yes supply Voltage might directly affects the intensity But How do I vary the supply voltage?

4

Supply voltage as stated in the ad is 3.7-12V.
Does that make a difference? (very very easy to bench test of course, just connect a different power source with different voltage).
What happens if you simply PWM the thing - as in the device's power supply? (a iitlle more work but still pretty easy to try - Arduino, transistor, some wiring/resistors...).

5

Though supply voltage is 3.7-12, irrespective of Input voltage, Output to the transducer(From Boost regulator) is 28V(so).
It seems to have a controller too on the board.

6

Well, PWM it is then.
Maybe make it really slow (like a second on, second off) as otherwise the capacitors of the boost converter will bridge the gaps.

7

I tried with a potentiometer connecting to the transducer and varying resistor(10K), the intensity was varying by a little amount.

And one more question,
As a reference to this video,Make your own Super Simple Ultrasonic Mist Maker - YouTube

@5:10, In the PWM output from the controller, If I change the PWM duty cycle keeping the frequency 103KHz same I should be able to vary the intensity, right?

Thanks

8

I was more thinking of a frequency in the order of 0.1-1 Hz, applied to the power supply of the device.

9

?

10

wvmarle:
switch it on/off for a second or two at a time.

11

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