Converting 2 sonar transducer based circuit into 1 transducer? best ICs to use?

[hood_electron]

Found this reverse engineering of the popular HCSR04 on youtube, but i need to be able to use a single transducer for both the receiving and the transmitting. Planning to use this in a 7X1 array. The outputs of the MAX232 are inverting so im a bit unsure on how to receive from the same transducer im transmitting from without blowing up my delicate little op amp.


And speaking of the op amp, is there any other filtering needed for the transducer other than the simple RC filter? also should i use some other ic (op-amp) than the one in this picture, im looking to get a reading of atleast 1mm precision (0.1mm if possible). The transducers will be harvested from HCSR04. I will be using STM32F11s (black pills) for the ADC and calculations.


Im very new to analog circuits so please be kind on my mistakes and incompetence

[MasterT]

 Speed of sound 340 m/s
 Freq. 40 kHz
 Resolution =  340 ÷ 40,000 = 8.5 mm

[hood_electron]

isnt the resolution you can get from the transducer based off your sampling rate?

[ledtester]

Found this reverse engineering of the popular HCSR04 on youtube, ...

What's the link?

This looks like it matches what you have:



The MAX232 is used to drive the transmitter harder than what the MCU can do on its own - like +/- 9V instead of 0-5V.

This distance sensor looks like it uses just a single transducer:

https://www.diymore.cc/products/dc-5v-waterproof-ultrasonic-module-distance-measuring-transducer-sensor-module

[hood_electron]

this is the video.

And yes, the schematic is indeed the of the sonar sensor im working with. Where did you get this?

Any idea on how i can make this into a single transducer design?

Thanks for the help