A02YYUW waterproof Ultrasonic Sensor UART and PWM, with ESP32

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A02YYUW Waterproof Ultrasonic Sensor, Getting Started Tutorial:
   • Waterproof Ultrasonic Sensor A02YYUW ...  

Watch the same video in Hindi Urdu:
   • Waterproof Ultrasonic Sensor A02YYUW ...  

IoT based Water Level monitoring using ESP32, A02YYUW, and Blynk:
   • Water Level Monitoring with Ultrasoni...  


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Project Description:
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If I made this mistake, then I'm sure it's something that could happen to you at some point too. These are both A02YYUW waterproof ultrasonic sensors; but still, they are not the same. Because one of them is a UART type and the other one is PWM. Which one is the best out of these two, I will explain this in a minute.

Design-wise, they are exactly the same, their front, their backside, even their wires are the same. Just by looking at these sensors, you can’t tell which one is the UART and which one is the PWM.

How did I find out, well let me tell you. I had already made a detailed video about the UART version of the A02YYUW Waterproof ultrasonic sensor.

After a few days, I needed some more Ultrasonic Sensors so I went on Amazon and purchased 5 ultrasonic sensors. At that time, I didn’t even know there was a PWM version of this Ultrasonic sensor. So, I placed the order without checking.

Anyway, when I received the ultrasonic sensors and connected them to the board, the Serial monitor was not giving me any output. At first, I thought maybe this ultrasonic sensor was faulty. So, I tried another sensor, but I didn’t get any output from that one either. Just like this, I tested all the Ultrasonic sensors one by one.

And when I would connect the UART version of the A02YYUW Ultrasonic Sensor, it would work perfectly.

Anyway, to confirm those ultrasonic sensors, I went back to Amazon and when I saw, there were two types: PWM and UART. So, it was totally my mistake because I wasn’t aware of the versions.


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