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PRO
Belgium
Thingiverse
#2  

i tested it works but what is that sound

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PRO
Synthiam
LinkedIn Thingiverse Twitter YouTube GitHub
#4  

Ultrasonic sensor uses sound. You're hearing the tick of the speaker that generates the ultrasonic sound

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United Kingdom
Twitter YouTube
#6  

I could hear mine too when I'm close to it. I'm guessing the frequency is just below the ultrasonic range (or we have ultrasonic ears!).

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PRO
Belgium
Thingiverse
#7  

danbachmann

thanks for telling