@drmosfet
I appreciate being able to use this device in the raining weather conditions, underwater sensor really spark the imagination, remotely monitoring your favourite fishing Hole, underwater robot etc.
@tomstruct
This has found me at just the right time. I'm planning water tank level monitors. Thanks Bill
@sjoythehawk
I bought a robot that comes with couple of JSN-SR04T inside. Today I met a problem that the JSN-SR04T was not working properly. Luckily I found your video, fully explained everything. And I understand very well about the sensor now. Saved me much time from looking across massive amount of information to solve the puzzle.
@TheTemporalAnomaly
I have been watching your videos for quite a while now and there is only one word to describe your content and presentation - fantastic! Well done Sir, I just wish there were more channels like this on science related topics, but for Arduino, your channel has everything covered. Chris, UK.
@heinrichhelmbold419
Still one of the most comprehensive instructors on the internet! Thank you so much for the amazing info and time you put into the videos
@opensourcefreedom9241
sound travels much faster in the water, so that would definitely affect the sensor's ability to get responding signals. At a close distance it is possible that the sensor would get the response before the signals have all stopped sending.
@columbiabuzz
I know I'll always get the straight dope here. Well-reasoned, detailed, rarely biased and always clear. I get all the info I need to make a decision that is best for me. Thanks.
@grubboy3514
This is the most in-depth dive on these things on the internet. Thank you for your time and effort in making this video...👍
@richarddarling7140
Your video has an excellent explanation of the theory and operation of both the JSN-SR04T & A02YYUW sensors. I had an application where I needed sensors to monitor the level of solution in two hypochlorite tanks in a water system. The JSN-SR04T has a "blind spot" that is too long to the application. I originally used two HC-SR04 sensors, but I was worried about the sensors getting wet. I found versions of the A02YYUW sensors that worked using the same pulse width modulation as the HC-SR04 so they were a 'plug and play' substitution. The sensors have worked for over two years with the only problem happening when workmen accidently 'disconnected one of the sensors (broke the wire). I believe that there are versions of the A02YYUW available that operate on PWM and could be directly substituted for the HC-SP04.
@sarojdebnath740
His Video workshops are really something "GOLD". Thank you Bill
@tvnsi8556
Just in time! To use as water level of my RV tank. As well as depth meter for my small boat. Thank you Master
@rupeshkoulge1616
Thanks a lot, your projects are something which I always look for. In one of my earlier projects, I have waterproofed HC-SR04, fitted it on top of my 1000 litres water tank to find the distance between the top of the water surface and sensor. Further by putting the dimensions of my tank in the code, I calculate the exact volume of water available in my tank and using automation, turn ON / OFF the water pump to maintain the water level. Furthermore, I also calculate the flow rate of incoming and outgoing water in litre/min to know the consumption. The project also sends imp notifications on my mobile. Surprisingly the project is still working great.
@AshersPlace
Lovely to see a new video today, thanks for the great work!
@jaumegb3710
I've successfully tested the JSN-SR04T underwater although I rugged it in the rear and the sides. But if you take into account that sound speed underwater is about 4 times faster than in the air,the minimum distance it could read was about 85 centimeters. Maybe it was too long for being tested properly in a bathtub.
@ceser33
Dear Sir! Thank you a thousand times! What you present is real science work! Thank you!!
@zusurs
I'm quite sure that these would work underwater, but you should take in to account that the measured distance should be multiplied by 4, due to the ~4 times the difference of the speed of sound under water (speed of sound in air is 0.231 times slower than in water). I also believe that this increased speed of sound also means that a minimum measurable distance of the sensors would be 4 times higher than normally. This should be tested in a pool, not in a bathtub that is way too small for the quoted minimum distances of these sensors. Also there is way too much echo underwater in a small bathtub.
@cjhtas
There's a problem with the A02YYUW sensor if you're trying to meausure a fluid level in a 150mm PVC pipe. The sound reflections confuse the sensor and it gives the wrong readings (something similar happens if you put it at the domed apex of a water tank, or near the corrugations at the side). I found that narrowing the sound aperture by cutting a 50mm high piece of packing foam to fit over the sensor with a similar sized rectangular window for it to hear through fixes the problem.
@christinewhybrow8813
Another brilliant video. I watch these things over & over, & ALWAYS check here or our forum when I get stuck on a project. I'm looking to build a weather station, & I think one of these might be perfect as an outdoor sensor!
@LummyTech
I just wanted to say that your videos are incredible. I recommend them all the time to students who are interested in anything Arduino related. You are a great teacher and an incredible resource. Thank you for all your hard work.
@Dronebotworkshop