11 best moisture detection sensors

Product description

Because many people say that NE555 can’t work, now it changed to TL555 It can avoid the problem that the resistive sensor is easily corroded, which greatly prolongs its working life. In contrast to the normal resistive sensor, this capacitive soil moisture sensor has no adjustable switching contact. It changes with the humidity. Thus displays the exact humidity values ​​in real time. Just need purchase an extra LCD Display and a microcontroller board with analog input from our store. You can give your plants the best possible care! Specification: Operating voltage: 3.3 ~ 5.5 VDC Interface: PH2.54-3P Size: 98 x 23mm (LxW) Pin: Analog signal output, GND, VCC Package Including: 5 x Capacitive Soil Moisture Sensor

User questions & answers

Question:	how do I connect to raspberry pi
Answer:	GND- negative VCC-power positive AOUT-signal output
Question:	With this work to detect being submerged in water? I want to use it to know when my sump pump isn’t working
Answer:	No, it will short out if submerged in water. You should use a float switch, something like this: https://smile.amazon.com/Anndason-Pieces-Plastic-Switch-Liquid/dp/B072QCHQ2P/. I took a piece of PVC pipe, drilled holes in it to let water flow in and out, stuck the bottom of the PVC in a small block of cement, mounted the float switch in a cap on the top, and set the whole thing in my sump.
Question:	what type of jst connector is used, want to create a longer cable. 2. is there a cable limitation to arduino
Answer:	We have a corded one, please check the picture
Question:	do you have a library for the arduino? How do I calibrate these? Getting an analog reading does not mean anything
Answer:	Take a reading while they are dry (that's your 0% reading), then take a sample of your soil and put it in a pot, insert the sensor and then water the pot until it can't hold any more water, then take another reading that's 100% saturated. If you want you can put the sensor near a plant and see what level it reads when the plant looks stressed from to little water and make sure you keep it wetter than that. Note: unless you are measuring pots, the moisture level near the surface is about useless for most plants unless they have very shallow roots.. for plants with deeper roots you probably want to waterproof the top portion of the sensor and bury it about 18" down.

Product description

Klein Tools ET140 Moisture Meter is designed to non-invasively detect hidden moisture content up to 3/4-Inch (19 mm) depth. Easily select between materials with mode button to test surface of drywall, masonry, hardwood, and softwood. The ET140 has easy viewing with bright, reverse-contrast display and LED bar graph. Pinless moisture detection in drywall, masonry, hard and softwood. Non-invasive EMF technology detects moisture up to 3/4-Inch deep. Moisture Meter has bright reverse-contrast display to read easily. Hold, Low battery, and Auto-Power off functions. Built to withstand a 6.6 foot (2 m) drop. Includes detector, 9V battery, and instruction manual. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

• Pinless Moisture Meter with electromagnetic field (EMF) technology allows for nondestructive detection of moisture content in building materials
• Drywall tool detects moisture content up to 3/4-Inch (19 mm) deep
• Easy viewing with bright reverse-contrast display
• Nine LED bars indicate moisture range
• Easy-to-select materials with mode button; drywall, masonry, hardwood, and softwood

User questions & answers

Question:	Does this also measure moisture in the air
Answer:	This tool will measure the moisture content of any building material including wood and drywall. If the test indicates a high moisture content in just one spot, you could probably conclude that there was a leak at that point.
Question:	I'm having trouble finding the locaton of a water leak in my car. WIll this work on my cars carpet and or headliner fabrics etc
Answer:	Yes, the device has four modes. Wall, masonry, soft wood, hard wood. Wall is drywall.
Question:	Is there a way to set measurement depth
Answer:	That is the same reason I purchased this unit. It worked great and I was able to see how much wall needed to be opened up.Well worth the money.
Question:	Is this an authentic Klein Tools product
Answer:	As far as i can tell the probes are about 3/8 long. The are metal, and have a plastic cover to protect them and you when not in use. The cap can also be flipped over once taken off, to help check device itself, for calibration. They are replaceable. They actually come with an extra set of pins (probes). Hope this helps.

Product features

Pinless Moisture Meter for Non-Destructive Moisture Detection in Drywall, Wood, and Masonry; Detects up to 3/4-Inch Below Surface

Klein Tools ET140 is designed to non-invasively detect hidden moisture content up to 3/4-Inch (19 mm) depth. Easily select between materials with mode button to test surface of drywall, masonry, hardwood, and softwood. The ET140 has easy viewing with bright, reverse-contrast display and LED bar graph.

Product description

This capacitive soil moisture sensor distinguishes most of the resistive sensors on the market 

and uses capacitive sensing to detect soil moisture. It is made of corrosion resistant material 

which gives it an excellent service life.

Built-in voltage regulator chip, support 3.3-5.5V DC, can be used for your Arduino and Raspberry 

Pi project

This sensor is 3-pin "Gravity" interface, which can be directly connected to the Gravity I/O 

expansion shield

Note: This sensor will monitor the soil moisture according to the principle of capacitive 

sensing, so put in different soil moisture, tightness, insertion depth will reflect different 

humidity

Specification:

Operating voltage: 3.3 ~ 5.5 VDC

Interface: PH2.54-3P

Size: 98 x 23mm/3.86" x 0.91"(LxW)

Cable Length: 200mm/7.87"

Pin: Analog signal output, GND, VCC

Applications:

Garden plants

Moisture detection

Intelligent agriculture

Package Includes:

4 * Capacitive Soil Moisture Sensor

4 * Analog Sensor Cable

• Operating Voltage: DC 3.3-5.5V；Output Voltage: DC 0-3.0V；Interface: PH2.54-3P.
• It is possible to read the amount of real-time moisture present in the soil (for judging whether the soil is wet or dry) by linking the analog output (AOUT) of the module to one analog input (A0) of the Arduino.
• This sensor is compatible with 3-pin interface, which can be directly connected to the Gravity I/O expansion shield. Pin: Analog signal output, GND, VCC
• The principle of capacitive sensing is used to detect soil moisture. It is made of a corrosion resistant material. It avoids the problem of being easily corroded and greatly prolongs its working life.
• Appligations: Through simple design, can automatic watering the vegetable garden, garden, control the flower pot soil moisture, all of electronic competitions and for Arduino Raspberry pi design etc.

Product description

The TOPGREENER TDHOS5 is a sensor switch in a class of its own, equipped with both a PIR (Passive Infrared) motion and humidity sensor. No longer will you have to keep your bathroom fan running all day after a shower to get rid of the condensation in the air! Eliminate mold and mildew caused by excess humidity from forming! The humidity sensor works by detecting moisture in the air to automatically turn the ventilation fan on or off based on the moisture level. The ventilation fan will continue to operate for the minimum time set or until the humidity in the room is reduced. The PIR sensor detects motion to automatically turn lights on and off. Perfect for bathrooms, laundry rooms, spas, or any other room with high humidity levels, the TDHOS5 will help make your space more comfortable and energy-efficient.



Excess humidity in a room causes the growth of mold, mildew, and fungi. Using this humidity sensor switch for the bathroom fan eliminates excess moisture, thereby eliminating mold and bacteria. Humidity-sensing technology monitors the moisture levels in a room to intelligently and efficiently control the ventilation fan. Keep your bathroom, laundry room, spa, and the shower fresh and energy-efficient with the TDHOS5 Motion Humidity Sensor Switch!



The PIR sensor features occupancy and vacancy modes. Occupancy mode provides automatic ON/OFF control of lights or vent fan based on motion detected in the room. Use the occupancy sensor when you want full automation of your light and ventilation fan. In vacancy mode, the lights or vent fan is manually turned on, and when no motion has been detected for the set time, the vacancy sensor will automatically turn off the light or fan.



Program all settings and adjust time delay, user modes, and humidity level from one button for user-friendly function.



This Humidity Sensor Switch features an interchangeable face cover that allows for easy cosmetic changes without replacing the entire unit.

• Dual-tech in-wall humidity control switch that controls both bathroom fan and light simultaneously. Dual technology of passive infrared (PIR) motion sensor switch and humidity sensor switch for fan. Automate light and exhaust fan control to keep you hands-free
• Humidity control switch turns fan ON automatically when humidity exceeds preset level and turns it OFF as it drops to normal to eliminate excess humidity, mildew and mold
• Humidity sensor switch features simple controls and operates in two modes: Occupancy Mode (auto on/off lights, auto on/off fan), and Vacancy Mode (manual on/ auto off lights, auto on/off fan). Adjustable time delay and humidity level
• Two single pole relays to control bathroom light and fan separately; Compatible with LED light bulbs; Energy savings of up to 40% with motion sensing control; Complies with CA Title 24
• NEUTRAL WIRE REQUIRED; 4 time delay settings from 15 sec to 30 min; 3 adjustable humidity levels; 120VAC, 3A fan/motors, 500W incandescent/halogen, 150W CFL/LED; Up to 600 sq.ft coverage, 180 degree field of view; Wall plate sold separately

User questions & answers

Question:	My light will be separately wired. Can i wire this switch such that the fan will come on by motion for a desired interval and also work in humidity
Answer:	Hi, pls kindly know that we don't recommend you use the cutting way, you can use some clips to roll it up which is used for shorten its height. Thanks for be interested in our MAGZO Magnet Screen Door 32 x 80, Magnetic Mesh with Heavy Duty for Entry Door Fits Door Size up to 32"x80" Max-White item.
Question:	I've single load line for both the fan and light. How do I make it work, maybe by using some additional device? I can't add 1 more load line
Answer:	Hi, yes, please kindly know our Magnetic Door Screen can be taken down when off season. Because it is held in place by HOOK&LOOP, you can easily remove it at anytime you want. We still have 38 X 83 inch EVA Magnetic Door Screen which can stop winter cold, reference link: https://www.amazon.com/dp/B071LGQB71?ref=myi_title_dp Hope our answer will be helpful for you, any concerns further please contact our customer service directly, always here serving for you, thanks.
Question:	Is there any way to turn the fan off (and make it stay off), if I so desire
Answer:	Hi, please kindly know that we still have Gray Color 34 X 78 inch Magnetic Door Screen, which screen will be 36 X 79 inch (include door frame part) will be the closest one for you to choose, sorry to tell you that it is out of stock now, the estimated arrival time will be in 28th July, reference link: http://www.amazon.com/dp/B01GCXSJGU?ref=myi_title_dp Hope our answer will be helpful for you, any concerns further please contact our customer service directly, always here serving for you, thanks.
Question:	Can I Disable the automatic light functionality and just use it manually
Answer:	We have 25 sizes magnetic screen door, and for 3 colors, gray, black and white. the garage screen door we will have 15 sizes to sell. thank you

Product features

TOPGREENER TDHOS5 Humidity & PIR Motion Sensor Switch

The TOPGREENER TDHOS5 is a sensor switch in a class of its own, equipped with both PIR (Passive Infrared) motion and humidity sensors. No longer will you have to keep your bathroom fan running all day after a shower to get rid of the condensation in the air! Prevent mold and mildew caused by excess humidity from forming! The humidity sensor works by detecting moisture in the air to automatically turn the ventilation fan on or off based on the moisture level. The ventilation fan will continue to operate for the minimum time set or until the humidity in the room is reduced. The PIR sensor detects motion to automatically turn lights on and off. Perfect for bathrooms, laundry rooms, spas, or any other room with high humidity levels, the TDHOS5 will help make your space more comfortable and energy-efficient.

Fresh and Energy-Efficient

Excess humidity in a room causes the growth of mold, mildew, and fungi. Using this humidity sensor switch for the bathroom fan eliminates excess moisture, thereby eliminating mold and bacteria.

Humidity-sensing technology monitors the moisture levels in a room to intelligently and efficiently control the ventilation fan. Keep your bathroom, laundry room, spa, and the shower fresh and energy-efficient with the TDHOS5 Motion Humidity Sensor Switch.

Occupancy Mode

Occupancy mode provides automatic ON/OFF control of lights and ventilation fan based on motion and humidity detected in the room. Use the occupancy sensor when you want full automation of your light and ventilation fan.

Vacancy Mode

In vacancy mode, the lights are manually turned on, and when no motion has been detected for the set time, the vacancy sensor will automatically turn off the lights.

Humidity No More

The fan is automatically turned on and off by the humidity sensor in occupancy and vacancy mode.

User-Friendly

Program and adjust all settings including time delay, user modes, and humidity level from one button for user-friendly function.

• PLACE ANYWHERE LEAKS HAPPEN - Don't let an unnoticed leak damage your home and cost you thousands. The Mindful Design Water Leak Detector can be easily placed in bathrooms, basements, underneath sinks or by water heaters to catch leaks as they happen. Keep your family safe and worry-free!
• LOUD 95DB ALARM - Each detector features an ultra-loud 95db alarm, no wiring or setup required. When water is detected the alarm will sound, alerting you to the problem before disaster strikes.
• COMPACT AND DISCREET - Measuring 3.25" x 3.25" x 1.25", this water alarm's small size allows it be discreetly placed wherever you need it, with multiple color options that will match your ideal placement location.
• DETECTS A VARIETY OF LEAKS - The highly sensitive sensors on each device can detect both pooling and dripping water, as well as high levels of moisture. The sensors can be identified as the two metal prongs embedded in the side of the device.
• REUSE AGAIN AND AGAIN - Don't waste money on disposable alarms! The Mindful Design Water Leak Alarm is made to be reused. Unwrap and install the included battery - once triggered, simply dry it off if wet and change the battery if needed. A low battery alert will let you know when it is time for it to be replaced.

User questions & answers

Question:	Is there any reason not to use lithium batteries with this device
Answer:	They are not intended to fit over glasses but may work with some small and low profile frames. For the majority of prescription glasses, you would probably need something larger such as our VFR (Over The Glasses) model.
Question:	Where are the sensors on this alarm? Can anyone show a photo of the sensor location? Thanks
Answer:	Measure your prescription glasses. Side to side. Top to bottom. Add about 2/16 of clearance to determine which safety glasses will work.. there is an instruction photo to look at if you need additional information
Question:	How long battery last
Answer:	I believe a respirator means having to do with your airway, this is just eye wear safety. Has nothing to do with your respiration.
Question:	Does it sensor water from the bottom
Answer:	Well sir, if you are making a satirical comment on the current discourse in our society, then bravo. If you are serious, then first you will have to assess whether getting eye irritation from drifting gas is really your greatest concern if you participate in any event likely to end with gas and rubber bullets. Industrial goggles are meant to be worn in workplaces where eye damage from splashing liquids are possible. They are vented to allow for comfort and will therefore allow for the intrusion of gasses. Workplaces that are subject to gas hazard require sealed suits with powered, high filtration ventilation. So the answer is either ha ha if you are joking, or "no way in Hell" if you were truly serious.

Product features

Home Protection From All Types of Leaks

This amazing tool detects the presence of many different types of leak issues. Pooling water, dripping water, or even high levels of environmental moisture.

An Alert You CAN'T Miss

A very loud 95Db alarm is featured on each individual detector. The ultra-loud alert will carry throughout your space and notify you at the first instance of liquid on the sensor.

Small and Discreet

The small 3.25" x 3.25" x 1.25" size of this detector means you can tuck it away in any space and still keep the area tidy.

Reuse Easily After the Detector Goes Off

1. Identify and fix the leak you have been alerted to
2. Remove the detector from the area
3. Dry off the detector, paying attention to the sensor areas.
4. Switch out the used battery for a fresh one.
5. Place the sensor in a chosen area for next use.

Place a water leak detector in all the areas you need it most!

This compact and discrete device will fit seamlessly into your home under sinks, in bathrooms, kitchens and all the common places you might need it. Many users also ensure they have one in the below areas:

• Pin: Analog signal output, GND, VCC
• Operating voltage: 3.3- 5.5 VDC, Output voltage: 0-3 VDC
• Interface: PH2.54-3P, Size: 98 x 23mm (LxW)
• This capacitive soil moisture sensor distinguishes most of the resistive sensors on the market and uses capacitive sensing to detect soil moisture. It is made of corrosion resistant material which gives it an excellent service life.
• Built-in voltage regulator chip, support 3.3-5.5V DC, can be used for your Arduino and Raspberry Pi project. Applications: Garden plants ,Moisture detection ,Intelligent agriculture

User questions & answers

Question:	Where is the datasheet / specs for this item? Searching online for "EK1940 datasheet" yields no relevant results
Answer:	Referring to the moisture sensors? Check the offerings of several sellers. I ordered a few of these sensors from each of several different sellers just to see if they are identical, despite the wide price variation. They are identical, except the component designations and circuit trace placements vary. One seller included a schematic, though its component designations didn't match those of the board legends. Another seller has a link to the schematic in the offer.
Question:	What library do I need for a raspberry pi
Answer:	You don't need a library, just need to read the analog pin,A0. This is what I use: // Calibration: SOIL_AIR is reading when dry, SOIL_WATER is reading when submerged in water about 3/4 up the stick // Used to calculate a 0-100% range based on the readings #define SOIL_AIR 362 #define SOIL_WATER 637 int get_soil_readings(int n) { int a0 = 0; for(int i=0; i
Question:	What are the measurement units? Centibars
Answer:	You need to calibrate the units in code. More details here. https://wiki.dfrobot.com/Capacitive_Soil_Moisture_Sensor_SKU_SEN0193
Question:	Could you submerge the moisture sensor fully in soil if all connections are adequately protected
Answer:	I put conformal coating and heatshrink on them and had no problems with soil immersion. I calibrate the sensors in water (100% moisture), and dry air (0% moisture) because there is lots of variation sensor to sensor in both offset and gain.

Product description

Features:

100% brand new and high quality.

The soil sensor is a simple breakout for measuring the in soil and similar materials.

The soil sensor is pretty straight forward to use.

The two large exposed pads function as probes for the sensor, together acting as a variable resistor.

The more water that is in the soil means the better the conductivity between the pads will be and will result in a lower resistance, and a higher SIG out.

Specifications:

Size: 6.1*2.3cm/2.4*0.9in

Weight: 3g(approx.)

Quantity: 10pcs

Package Includes:

10 x Sensor Modules with Pin Headers

• 【High quality】 The soil meter humidity detection module is sold in more than ten quantities, all of which are 100% brand new, high quality, and are high quality electrical modules, which are sturdy and durable.
• 【The main purpose】The soil sensor is a simple breakthrough for measuring in soil and similar materials. It is used in agriculture to monitor the water content of crops and the temperature and humidity of the soil.
• 【Simple and durable】 The soil sensor is very simple and easy to use, just touch the detector with the probe.It can also control the soil threshold by adjusting the potentiometer
• 【Design principle】 Two large exposed pads act as probes for the sensor and act together as a variable resistor. The widening of the sensing area improves conductivity and prevents rust when exposed to the soil, prolonging the service life.
• 【Application】 The more water that is in the soil means the better the conductivity between the pads will be and will result in a lower resistance, and a higher SIG out. Module Output is high level when the soil deficit,or output is low.

Product description

Description:

1, This is a summary of the moisture sensor can be used to detect soil moisture, soil water when the module outputs a high level, whereas the output low. Using this sensor make an automatic watering system, so that your garden plants need people to manage.

2, adjustable sensitivity (shown in blue digital potentiometer adjustment)

4, Operating Voltage 3.3V-5V

5, module dual output mode, the digital output is simple, analog output is more accurate.

6, with fixed bolt hole for easy installation

7, small PCB board size: 3cm x 1.6cm





Small plate interface specification (4-wire)

1 VCC 3.3V-5V external

2 GND GND External

3 DO small board digital output interface (0 and 1)

4 AO small plates analog output interface





Package Include: 5pcs Soil Hygrometer Humidity Detection Module

• This is a summary of the moisture sensor can be used to detect soil moisture, soil water when the module outputs a high level, whereas the output low. Using this sensor make an automatic watering system, so that your garden plants need people to manage
• adjustable sensitivity (shown in blue digital potentiometer adjustment)
• Operating Voltage 3.3V-5V
• Module dual output mode, the digital output is simple, analog output is more accurate; with fixed bolt hole for easy installation
• Small PCB board size: 3cm x1.6cm

Product description

Specification:

Product name: soil moisture sensor

Material: Metallization

Weight: about 10g/pcs

Size: 20x60mm/0.79x2.36inch

Packing method: electrostatic bag sealed

Package contains: 2PCS soil moisture sensor



Technical specifications

Power supply voltage: 3.3V or 5V

Working current: less than 20mA

Output voltage: 0-2.3V [2.3V is the voltage value completely immersed in water], 5V power supply, the greater the humidity, the greater the output voltage.

Sensor type: analog output

Interface definition: 1-pin signal, 2-pin ground, 3-pin power positive

Service life: about 1 year (surface gold-plated treatment, enhanced conductivity and corrosion resistance)

• The surface of the sensor is metallized to enhance its conductivity and corrosion resistance, which can extend its service life.
• Insert it into the soil, and then use the AD converter to read it. With its help, the plant will remind you: I want to drink water, please give me some water to drink.
• The module is accurate and reliable, and has good long-term stability. With fixing screw holes, easy to install and fix.
• Small size, low power consumption and fast response speed. High reliability, strong vibration resistance, good electromechanical performance and long signal transmission distance.
• Use this sensor to make an automatic watering device. When you are away from home for a long time or watering time has passed, it can sense whether your plants are thirsty.

• NEW GENERATION: We update a critical opition for minimum run time, you can setting for how long the fan runs in auto/manual mode, default time is 1 min (1 min - 60 min)
• DEHUMIDIFICATION FUNCTION: Our Ortis humidity sensor fan switch uses a microprocessor combined with the advanced digital sensing technology. To detect the humidy level in the bathroom and automatically turn on the exhaust fan for ventilation, keep your bathroom dry and clean, creating a healthy environment for you and your family. It also has humidification function. When the weather is dry, it can be used by connecting the humidifier
• AUTO/MANUAL MODE: When set to automatic mode, it can automatically detects the humidity in the room and turns on the bathroom fans, it will automatically stop when the moisture value you set is reached. When set to manual mode, press ''M '' button, you can turn on the fan; Press ''M '' button again, the fan can be turned off or run 1 min to automatically turn off
• EASY TO SEE: Our in-wall humidity sensor & fan control uses LCD screen, displays real-time humidity value. It is easy for you to view and manage the humidity level of the bathroom. The button can also be locked to avoid touching by mistake
• NO DISTURB AT NIGHT: Are you still worried about that the loud exhaust fans at night will cause you to have trouble sleeping? Our wall humidity sensor switch for bathroom fan can manually set the time off fan operation at night about 4-16h, enough time to ensure you a good night's sleep. And will return to automatic mode when the time arrives, you no longer need to manually set, make your life more healthier and easier
• WIDE APPLICATION: The moisture sensor switch are perfect for bathrooms, laundry rooms, basemenst, garage, pantry or any other location high levels of humidity. The humidifying function can be used in your bedroom, living room, etc. When in non-operating mode, the blue light will turn off, you no longer worry about it will trouble you. Support 110/220V, neutral wire is required

User questions & answers

Question:	Do I have to enable the "do not disturb at night" function every night, or I only have to enable it once
Answer:	Hi, need enable it every night!

Product features

Ortis Humidity Sensor Switch

Our Ortis humidity sensor switch automatically detects the moisture level of the bathroom through the humidity sensor, and then automatically opens the exhaust fan for ventilation when the humidity level is too high, keep the bathroom clean and tidy. The sensor automatically turns the fan off when the humidity level has dropped, which is highly efficient and energy saving. There is no need for you to keep the fan on for ventilation. Let your life easier and healthier.

Package Include:

-1 x Humidity Sensor Switch

-2 x Screws

-3 x Terminal Cap

-1 x Users Guide

Auto/Manual Mode

Auto On/Off：In the default auto mode, the humidity sensor switch can automatically detects the humidity and auto turns on/off the bathroom fans.

Manual On/Off: Press M button, you can turn on the fan (default run time is 1 min). Press M button again, the fan can be turned off.

You can setting for how long the fan runs in auto/manual mode: 1 min-60 min.

LCD Screen

The screen uses LCD screen, displays real-time humidity value. It is easy for you to view and manage the humidity level of the bathroom.

Digital Sensors

The humidity sensor switch uses a microprocessor combined with the advanced digital sensing technology, to detect the humidity level in the bathroom and automatically turn on the exhaust fan for ventilation, keep your bathroom dry and clean.

Lock Button

In normal state, you need to simultaneously hold press both M button and Up/Down button for 3 seconds, the button will be lock; press both M button and Up/Down button again for 3 seconds, the button will be unlock.

• Output Voltage: 0 ~ 3.0VDC , Output Voltage: 0 ~ 3.0VDC
• Analog output, Supports Gravity 3-Pin interface
• Supports Gravity 3-Pin interface
• Interface: PH2.0-3P , Dimension: 98mm * 23mm
• Applications: Garden plants ,Moisture detection ,Intelligent agriculture

User questions & answers

Question:	Can it work for air humidity
Answer:	No, but the DT11 does.
Question:	Can this be used as a humidity sensor
Answer:	No, the material it is measuring needs to be able to conduct electricity. (Wet soil will conduct, but humid air won’t.)
Question:	How many sensors are in a single unit-purchase
Answer:	5
Question:	Can this control a solenoid irrigation valve
Answer:	If you don't need anything more complicated than "on when falls below x, off when above", I don't think you would even need an Arduino. You could hook DO to a relay which could power some circuitry to alternate the solenoid irrigation valve directly in hardware. However you could get more detailed information and finer control with a microcontroller or PC with GPIO like a raspberry pi.