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Ultrasonic Transducer Resonance Frequency Tracking using an Arduino

Husain Shekhani • Mar 17, 2023

  I hosted a webinar on March 10, 2023 on

"Ultrasonic Transducer Resonance Frequency Tracking"

You can watch the recording on my YouTube Channel here: 

https://youtu.be/f8sRapa-swM

Here is a link to the presentation notes.


Topics

In this webinar recording, I used an Arduino microcontroller to provide frequency control feedback based on current measurements.

I drove an atomizer transducer at a specified current level. I utilized a frequency generation IC (SI5351), an audio amplifier board to produce 90kHz-110kHz. I also used a hand wound transformer for impedance matching. Finally, a simple peak detect circuit conditioned the current signal to be read by the analog input of the Arduino.


Here is the outline of the webinar.

  • 0:00 -Welcome to my 11th webinar
  • 1:54 -Outline
  • 5:07 -Choosing a transducer
  • 7:47 -About Ultrasonic Advisors
  • 8:57 -Block diagram of feedback circuit
  • 13:25 -Drive circuit principles
  • 18:25 -Feedback control with regards to impedance frequency response
  • 20:39 -Impedance response of mesh atomizer with and without fluid
  • 23:27 -Driving Amplifier
  • 33:30 -Amplify voltage
  • 36:30 -Transformer winding
  • 39:09 -Walk through of experimental circuit setup
  • 46:14 -Final circuit diagram
  • 53:58 -Current peak detect circuit
  • 55:42 -Arduino feedback loop code
  • 59:30 -Oscilloscope readings
  • 1:04:04 -Arduino serial monitor of feedback loop
  • 1:06:02 -Questions and Answers


***Announcement***

My next webinar will be 11AM ET - April 14, 2023  "Implementing feedback loops for current and phase in an ultrasonic drive circuit"

Here is the link to sign up for the upcoming webinar: https://www.ultrasonicadvisors.com/monthly-ultrasonic-webinar

Follow the link here to learn about my ultrasonic transducer consulting services and prices

Services and Prices

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