legolaslee
New Member
Hi guys. i need help for building an ultrasonic motion sensor. There must be a buzzer and LED light up when any movement is detected by the sensor. So I'm wondering if there is any reference circuit that i can refer to.
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Hi guys. i need help for building an ultrasonic motion sensor. There must be a buzzer and LED light up when any movement is detected by the sensor. So I'm wondering if there is any reference circuit that i can refer to.
Thanks!
But what if I want to use ultrasonic transmitter and receiver?
Oh nice!
By the way I have a question.
What is the difference between this 2.
https://web-ee.com/images/UltrasonicMotionDetector.pdf
https://kitsrus.com/pdf/k20.pdf
Basically they are the same, except the K20 uses a crystal for stability, thats the one I would choose, if pushed.![]()
Thanks, I'll have a more careful look thru.I think both designs use crystals.