6 Pieces Black Water Level Sensor Aquarium Tank Side Mounted Horizontal Liquid Float Switch

Works great with Arduino to control nutrient solution levels in hydroponic system. digitalRead(A0); returns "1" or "0." For my application, as sensor falls, a "1" is sent to the Arduino, which charges a DC-DC relay to activate normally closed solenoid valve until signal reads "0" again. I was hesitant to order after reading a lot of the reviews that insisted they go out after a short while, until I more closely examined the reviews. You cannot wire these directly between a source and a load (over about 5v) or they will predictably burn out! They are sensors, not switches, and as such must be "read" by another device that is then able to act upon it. As at least one other reviewer has noted, Arduino is a simple and safe platform for reading the signal and causing some other action based on the state of the sensor. If you need more info, Youtube it - "Arduino float switch"

Very simple reed switch. So far, all of them work great. The supply an input to a microcontroller. These are very low current switch, keepnthat in mind. If you are looking to directly use it as an inline switch, I would suggest using it to feed a MOSFET or opto-isolator. I would recommend using a SCR if it is for AC current

Installed in auto water dispenser for i gallon water container for dog. When water gets very low the contacts close and a buzzer i rigged up goes off.

Tested all 6 with a continuity tester, all 6 worked with varying activation distances [2-5mm of float drop]. Bought these as coolant level sensors for a CNC system retrofit and will update as needed. Recommendations for use: Limit voltage to <150V. Limit current to <20mA. If you need to control more power use them to switch a MOSFET or SSR [Solid State Relay].

I used the float switch, a 5v usb power supply, and a relay to water my Chirstmas tree automatically. As a side note... sometimes aliexpress lists the breakdown voltage of float switches as their "Maximum" voltage when their actual specified operating maximum voltage is 50% of this... so you think 120V ac is safe to use with your float switch with the "maximum" voltage of 200V... and it is for 2 years... but... then, while you're sleeping, the switch gets stuck(electrically) closed and dumps 4 gallons of water under your Christmas Tree...

ES EXACTAMENTE LO QUE PEDÍ

Connected in series to a 12v motor pump. Set to turn on once the switch is flipped. It work for a few times during test but now seems to be permanent on position. I guess despite the switch seem water resistant but not when it is submerged in water.

For the price I can’t really complain. I had to file down the plastic injection port piece. I did have one fail but easy fix. Five stars because for the price I don’t mind putting finishing touches to it.

Muy buenos, hasta el momento sin fallas