Question 1

Does it have an example code for use with a raspberry pi zero w or with an esp32 ?

Accepted Answer

If by "it" you mean does the device come with sample code?  The answer is "No".  But there is a huge volume of info on YouTube and on the internet.  Just google either SR 04 sensor or the part number of this one.

Hope that helped.

Question 2

Is this an automatic or controlled version?

Accepted Answer

If you're asking whether the device will transmit and receive at regular intervals the answer is no.  The device requires a 10us wide active LOW pulse (I send a 50us wide pulse just to be safe).  Then the device will return a pulse whose width is proportional to the distance measured.  There are a number of different C++ functions that will perform this for you: Pin() and newPin() are two that come to mind.  Google them for more info.

Hope that helped.

Question 3

Can I use with esp8266? And which one pwm or uart?

Accepted Answer

Short answer: Yes you can.  And you can use either version depending on what you're trying to do.  One version just runs continuously, while the other requires that (in your case) the ESP8266 output a 10us minimal active LOW trigger pulse.  That pulse tells the device to send an ultrasonic burst toward the target.  The device then switches to "Receive" mode and waits for an echo back from the target.  The pulse width of the echo pulse is proportional to the distance from the target.  There is an enormous volume of information on the subject on the internet.

Hope that helped.

Question 4

Is there a sample code for use with Raspberry Pi Zero???

Accepted Answer

Yes--assuming that you have an ANSI C compiler (and I imagine that you do) there is a huge volume of info on YouTube, as well as on various forums.  The only difference is that this device requires an active LOW trigger pulse of 10us minimum pulse width.

Hope that helped.

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Taidacent Waterproof Ultra-Precision Ultrasonic Sensor Presence and Detection Parking Occupancy Sensor Vehicle Presence Detector Ultrasonic Range Detector in Outdoor (PWM)

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