I bought an ultrasonic module. It works fine. But I'd like to know how the pot on the module works. Thank you.
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refer to the datasheet for the module – jsotola Jul 25 '20 at 20:40
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2What does the datasheet say and why didn't you link it in the question? "*No datasheet? No sale!" See [What to check for when buying an electronic component or module?](https://electronics.stackexchange.com/questions/504044/what-to-check-for-when-buying-an-electronic-component-or-module). – Transistor Jul 25 '20 at 20:40
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Where did you buy it? Didn't it come with manual, datasheet or instructions? – Justme Jul 25 '20 at 20:41
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@Justme I bought it from aliexpress https://tinyurl.com/yxn8nxj7 – Studuino Jul 25 '20 at 20:48
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Why not ask from where you bought it? – Justme Jul 25 '20 at 20:54
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@justme I've sent the request for datasheet/manual but no reply. – Studuino Jul 25 '20 at 21:02
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3It's not a pot, it's a variable inductor or transformer. – Spehro Pefhany Jul 25 '20 at 21:22
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Internet says it is an inductor tuning frequency of sensor to 40kHz. Do not adjust.
Part number is probably K4000001 from Pro-Wave Electronics with an variable inductance of 10.6 mH at operating frequency of 40.0 kHz.
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