A02YYUW waterproof Ultrasonic Sensor UART and PWM with ESP32

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A02YYUW waterproof Ultrasonic Sensor UART and PWM, with ESP32
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A02YYUW Waterproof Ultrasonic Sensor, Getting Started Tutorial:
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Watch the same video in Hindi Urdu:
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IoT based Water Level monitoring using ESP32, A02YYUW, and Blynk:
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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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#A02YYUW #Waterproof #ultrasonicsensor

Пікірлер: 13

@lint2023 4 ай бұрын

Thanks for all your videos. The waterproof sensor caught my attention and I put this on my list of things to do. William, USA

@PhG1961 4 ай бұрын

Great!!

@lohikarhu734 4 ай бұрын

I like the pwm version better, as it is much more deterministic...it guarantees that you get a return value in less than about 40 ms, and usually shorter...also, if you use a hardware timer, instead of software, you only need to wait for its indication or interrupt...the hardware timers are usually closer than 100 ns per tick, so the resolution is then as short as 0.02 mm ...uncertainty much greater than that, but you get the idea. For example, Max delay from falling edge of trigger to rising edge of distance pulse 17 ms Then 5,75 μs per millimeter distance, For target at 50 cm, 17 ms delay + (57,5 x 50) μs = 2,875 ms for total time of 19,875 ms Since the "no target found" gives a 35 ms pulse, you have a 52 ms worst case time from trigger to event end, but, if you know a maximum distance limit for your application, you could use a second timer channel to give an interrupt if the measurement time is exceeded ...so, for, say 100 cm max target, the 'distance watchdog timer is set for start on rising edge of measurement pulse, and timeout set to be 5750 μs, thus, if you ping the detector, you would get a "no target" interrupt, or status bit, after 22.75 ms....much, much better than waiting the 45-60 ms + data word time, with uart...just thinking... (I've been doing real-time microcontroller work for going on 45 years, was a Motorola application engineer for several years)

@erkkameskanen1405 26 күн бұрын

Yeah, and wonder how UART will handle readings accuracu when temperature fluctuates 10 - 100C with relative humidity close to 100% all the time. With PWM one can implement a function to mitigate these changes in environmental variables.

@ochjoo77 2 ай бұрын

Thanks for the video, just have one note: when using a lot of different sensors and multiple of these ultrasonic sensors on a single board you run into lots of troubles with the uart,even if the board supports multiple uart, I found that it makes the board (esp32) very buggy and unreliable. Pwm should be better in this case as there is hardware support multiple pwm inputs so its not as taxing on the board really.

@ElectroniClinic 2 ай бұрын

i have been using the UART version and its working exceptionally well, even in my yesterday's video based on the Hydroponic system, it performed very well with high accuracy. I used it with the so many other sensors and wifi connectivity at the same time. you can check out that video.