Taidacent Non Contact Liquid Level Sensor Contactless Water Level Sensor Externally Attached Pipe Water Float Switch NPN Output Capacitive

This is a very good, reliable sensor. Prior sensors that were in the water accumulated crystals on the contacts and failed. These detect water extremely well without contacting the water. I noticed an owner is running them at 3.3V. I was also, but when deployed in the greenhouse over time and temperature, they start flashing (failure notice) after a day or two. At 5V, there have been no failures in 10 days. Very pleased.

The sensor works. I think the reason that some people can't make it work is because it has an open collector output. There is an NPN transistor inside. The collector of that transistor is connected to the signal output line. That means that the signal line needs a pull up resistor. I use a 10k resistor connected to 3.3 volts (I'm using an ESP32). However, you can connect Vcc of the sensor to 5V and still use the 10k resistor to 3.3V, or if you are using 5V logic, to 5V. If you don't use a pull up, the signal line will never go high. That's how open collector outputs work.If you are using Arduino, you may be able to set the internal pullup resistor. You do that when you set the pin you are using as an input.setup() {pinMode(pinNumber, INPUT_PULLUP); // Replace pinNumber with the desired digital pin}

This is not a plug-and-play sensor, in that you'll need to power it yourself. I knew that going in. But I've been trying to solve a problem where I can't tell the water level in my hydroponic Farmstand, and this sensor works *perfectly* for that.I *would* like to reverse the behavior of the LED, so it's on when water is not detected, not sure if that's a me problem though.I'm currently controlling it with a QT-Py from Adafruit, power from the 5v pin (though it *does* seem to work with the 3.3) and I hope with a little more tweaking of ESPHome, I'll be able to signal through Home Assistant (I'm seeing flapping through the signal pin when water is detected, but it stays off when water is not, so I'm probably reading it wrong, I don't really know what I'm doing with NPN outputs), but in these things, I often don't know what I'm doing until it either works like I see it in my head, or something catastrophically fails. But that's a me problem; this sensor is awesome.

After adding a 10k pullup resistor, trying 5 & 9v, playing with sensitivity adjustment ... so what am I missing from anyone who can this thing to work?

Good sensors. Works as expected. Using with a ESP32 microcontroller

These are amazing. First reasonable priced senor that will work through the thick plastic water tanks on the boat. I'm also using double sided foam tape to attach them. Being able to adjust the sensitivity is everything.

Love this sensors for some reason Amazon won’t let me upload the video that I recorded. I use I wiring with two of this on my coffee maker tired to be constantly filling with water every time I want a coffee so I use one in the top and the other in the bottom so the valve can take a breake. Used with a standard relay that I had left from a car 😂. I saw this sensors on a video and people said that it don’t exist so guest what

Good price excellent workmanship