Floor Water Sensor for Flood and Leak Detection (30 ft)

Just received this product. Using it to automatically add water to a pool. Connected it to an 12 bit ADC. A 10M resistor divider is required. Have ran several tests including fully submerged for hours and then fully removed from water. Works perfectly. As the device dried the voltage approaches 0V. Will put into production shortly. Update: After one season, sadly the chemistry of the pool water caused the leads to erode. As a result a different sensor maybe needed for my use. This being said the sensor did perform flawless until the erosion.

When switch is open it has 2.4 Meg-Ohm resistance and when closed it has 0.4 meg-Ohm resistance. Switches typically have infinite resistance when open and < 5 ohm when closed. Therefore, switch would not allow enough current flow thru to active local audible alarm when sensed and can only flow very very small amounts of current which is not enough to activate many alarm sensors/devices.

All you have to do is hook the red wire into GPIO pin in my case i used 23 and the white wire to GND on the raspberry pi. Then set pin a pull up resistor in code and test if you can read from it or not. Code (python): import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) GPIO.setup(23, GPIO.IN, pull_up_down = GPIO.PUD_UP) if GPIO.input(23): print "no water" else: print "water"

Unlike the 6ft version whose contacts can be adjusted by bending this unit's contacts are perpendicularly imbedded into the housing meaning that you must have a significant amount of water between the floor & the contacts as-in an outright flood condition.. Yo guys, water seeks its lower level & fans out.. Might try and sand-down the 2 feet on the housing to get the contacts closer to the floor..

..this is only a 2-wire detector. Instead, I purchased the 4-wire GRI 2600 12 Volt DC Water Sensor & 25 feet of 4-wire cable. The GRI 2600 worked for my application.