Single Ultrasonic Sensor

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hello! trying make range finder using single ultrasonic sensor, tx/rx in one.
i couldn't manage make work schematic... trying use 2 of them, 1 tx , other rx, right that? when activate code ultrasonic sensor makes funny squealing sound, can hear clicking or ping sound , distance measurement wrong, if have ideas on how fix issue muchly appreciated.
i using push-pull pwm pins 9,10.

so, no schematic , no code.
helpful.


Arduino Forum > Using Arduino > Sensors > Single Ultrasonic Sensor


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