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Description:
Nominal frequency (KHz): 40KHz
Emission sound pressure at10V (0dB = 0.02mPa): ≥110dB
Receiver sensitivity at40KHz (0dB = V / ubar): ≥-75dB
Capacitance at1KHz, The part with T is the Transmitter; the part with R is Receiver.
Package Includes:
10* Ultrasonic Transmitters Probes
10* Ultrasonic Receivers Probes
Todd K. Moyer
Reviewed in the United States on July 9, 2023
When I ordered these sets of TX/RX ultrasonic transducers, I had expected something more along the lines of digital input to the TX, and if the signal was detected by the RX, it would send out a digital signal indicating the presence of the signal.Instead, think of these as sets of specialized loudspeakers and microphones. They are tuned to work especially well at 40 kHz, above the range of human hearing, and are rather directional. I have had difficulty getting good data on these transducers, but I did find a fuzzy copy of a datasheet that seems to apply to them.You'll see sensors similar to these in many ultrasonic range finders available; the TX and RX are mounted side-by-side, and the TX sends out a pulse, while the RX determines how long it takes for the reflection to come back, from which delay you can estimate the distance to an object that reflects the sound wave.Another idea I'd have is to try to do a simple remote control: point the TX and the RX and stimulate it with 40 kHz, and with some amplification and detection circuitry, you could have a simple on/off control. Or use pulses to build a more complex communication system, maybe 100-300 bits/second is feasible, possibly a bit more.To test these things out I drove the TX with a signal generator, 40 kHz sinusoid of 5 Vpp, and sensed the output of the RX with an oscilloscope. There is plenty of signal to allow observing it without amplification. See the oscilloscope captures attached to this review. It takes about 500 us to 1 ms for the RX signal to build after the TX signal is sent. In the scope photos I had the TX and the RX separated by only about 100 mm. If you separate them even more, there will be more delay from the transit time of the sound wave. But in these photos you're seeing mostly the delay from the time for the signal to build in the RX, probably due to some resonance built in.All in all, these transducers are fun to experiment with, and not very expensive. Just be aware that they take some additional circuity to make them useful.
Josh
Reviewed in the United States on December 28, 2023
Took a while to test these since you have to design your own driver if using the raw component like this, that said I’ve used 3 sets with no issues and hope the rest are fault free as well. So far everything works as expected.
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