Waterproof Ultrasonic Module JSN-SR04T Water Proof Integrated Distance Measuring Transducer Sensor for Arduino

I'm using it to monitor my sump pump with a raspberry pi zero w and raspi-sump. So far it's working very well. I didn't realize that this version of the sensor does 3.3v-5v. I ended up just wiring it up with a voltage divider so it's running in 5v mode. There was a youtube video of a person complaining that the sensor was unreliable but others hypothesized that it might be because he didn't have stable power coming from his arduino. The image shows how the sensor's output doesn't vary much in the 1-1.5ft range but outside of that it can fluctuate a couple tenths of an inch between 10 second readings. There's are also enclosures for the device on thingiverse which is a great plus when looking for a sensor.

Difficult to figure out if you are using it on a different microprocessor, I had two electrical engineer professors spend a lot of time helping me before this device could be made to work. It also does not have the range or accuracy advertised.

Easy to use, good range and accurate. Great value.

Well built and easy to interface.

Very easy to use with ESP32, Raspberry Pi or Arduino. Not very accurate for my needs (I need 1 mm precision) and has many missed readings (zero readings) which complicates programming.

Easy to setup. Works well with Arduino.

I bought two of these and one worked and the other did not. During Summer I was very happy with the working one for our 2500 water tank. It occasionally sent a crazy figure but the level did not change much each day so I ignored anything over the tank depth and averaged the rest. All good enough. Then came Fall and the temp dipped to 18-F-degrees. We have pipe-tape heaters on the tank pipes to prevent freezing so not a big deal. But, the JSN board just gave up and sent weird numbers all the time until the temp came up to around mid 30-F during the afternoon. So, I am now concerned for Winter as clearly these things do not have a very wide operational temperature range. I will have to look for a better alternative and thow this one in the trash. If you live in a year-round warmer climate these may be good enough. But if the temps fall below about 20-F they are no use at all.

overall it works, pros - its water proof, cons - the Ultrasonic Sensor cable can not be extended. I tried. you will need to house the circuit board and mount it away from the Arduino or Board of your choice. and extend the power ground trig echo circuits. so far I have the cable at 20 feet and it works.