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The unit is small and compact, requires only simple wiring. It boasts low power consumption and high switching capacity. And has several functional stability characteristics.
Specifications:
Type: water level sensor module
Power supply current: 20mA
Power supply voltage: DC12V
Power: 20W
Wiring
N Neutral in
L 12V in
N Neutral out
L2 12V out
What's in the box
1 x water level sensor module
This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. While the sensor is good up to 125°C the cable is jacketed in PVC so we suggest keeping it under 100°C. Because they are digital, you don't get any signal degradation even over long distances! These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter. They work great with any microcontroller using a single digital pin, and you can even connect multiple ones to the same pin, each one has a unique 64-bit ID burned in at the factory to differentiate them. Usable with 3.0-5.0V systems.
The only downside is they use the Dallas 1-Wire protocol, which is somewhat complex, and requires a bunch of code to parse out the communication. If you want something really simple, and you have an analog input pin, the TMP36 is trivial to get going.
We toss in a 4.7k resistor, which is required as a pullup from the DATA to VCC line when using the sensor.
Specifications:Cable specs:
- Stainless steel tube 6mm diameter by 30mm long
- Cable is 36" long / 91cm, 4mm diameter
- Contains DS18B20 temperature sensor
- If your sensor has four wires - Red connects to 3-5V, Black connects to ground and White is data. The copper wire is soldered to the wire shielding
- If your sensor has three wires - Red connects to 3-5V, Blue/Black connects to ground and Yellow/White is data
DS18B20 Technical specs:
- Usable temperature range: -55 to 125°C (-67°F to 257°F)
- 9 to 12 bit selectable resolution
- Uses 1-Wire interface- requires only one digital pin for communication
- Unique 64 bit ID burned into chip
- Multiple sensors can share one pin
- ±0.5°C Accuracy from -10°C to 85°C
- Temperature-limit alarm system
- Query time is less than 750ms
- Usable with 3.0V to 5.5V power/data
- 1 x DS18B20 Digital temperature sensor
- 1 x 4.7k resistor
- Adafruit's Raspberry Pi Lesson: DS18B20 Temperature Sensing
Have you ever wanted to control the flow of a liquid using your computer or microcontroller, but didn’t know how?
Well, here’s how: The 12V solenoid controlled fluid valve. Simply connect a fluid source to the fluid input then once the 12Vdc is applied the fluid will start to exit until the 12Vdc signal is removed.
If your signal is 5V , then you can use relay 5Vdc to control the 12Vdc from your microcontroller.
Specifications:
Voltage: 12V DC
Rated Power: 5W
Pressure: Max 8 Bar
Operation model: Normally closed
Port Size: 1/2''
Fluid temperature: 0-100
Usage: water and low viscosity fluids
Flow characteristics: 0.2Bar>1.5L/min 1Bar>7L/min 3Bar>12L/min 8Bar>20L/min;
What's in the box?:
1 x Water Solenoid Valve
Please note:
The actual valve size in the unit is smaller than the port size as you will find with most taps.
Description:
The liquid level switch detects the rising level of liquid in a sump or tank. It can be connected to a micro controller. It can then be used to start/stop a pump which then pumps liquid in/out until the level of the liquid has been restored to the point where the pump is switched off again. The switch may be used in a pump station, a sensor, a tank alarm, or other devices.
Specification:
Contact Rating: 10W
Switching Voltage: 220V
Switching Current: 0.5A
Breakdown Voltage: 220VDC
Carry Current: 1.0A
Contact Resistance: 100mohm
What's in the box:
1 x Liquid Water level sensor
Resources:
Python library
Introduction to Buttons and Switches
Types of buttons and switches
This product is mainly used for water metering
High amplitude ≥ 4.6V
Low amplitude ≤ 0.5V
Electric strength 1250V/min
Insulation resistance ≥ 100MΩ
Hydrostatic pressure testing ≤ 2.0Mpa
Specification:
The lowest rated working voltage: DC4.5 5V-24V
Maximum operating current: 15 mA (DC 5V)
Working voltage range: DC 5~18 v
Load capacity: ≤ 10 mA (DC 5V)
Use temperature: ≤ 80°C
Operating humidity range: 35%~90%RH (no frost)
Allowing pressure: pressure 2.0Mpa
Temperature: -25~ 80 °C
External threads: 1/2"
Outer diameter: 20mm
Intake diameter: 9mm
Outlet diameter: 12mm
Application:
Water heaters, water vending machines, flow measurement
Package included:
1x Water flow sensor
Flow sensor Wiki
An instructable on how to use the Flow Sensor with Arduino
Adafruit experiment connecting the Flow Sensor to a Raspberry Pi
https://www.ardumotive.com/water-flow-sensor-en.html
RPi: https://www.youtube.com/watch?v=8JXd-2_zJQ0
A compact vertically mounted float switch which can be mounted at either the top or bottom of a tank (by the supplied 'O' ring and nut) to either rise or fall for activation (internal magnet) of a sealed reed relay.
The sensor is supplied pre-wired with flying output leads.
Float switch is a used to sense the level of liquid within a tank, used to activate a pump, an indicator, an alarm or other device.
Use them with hydroponics, saltwater tanks, freshwater tanks, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, or what ever your project may be
Contains no mercury
Down float switch
Specifications :
- Maximum Load: 50 W
- Max Switching Voltage: 100V DC
- Minimum Voltage: 250V DC
- Maximum Switching Current: 0.5 A
- Max Load Current: 1.0 A
- Max Contact Resistance: 0.4 Ω
- Temp Rating: -20~ 80℃
- Net Weight: 12g
- Material: PP

Package includes :
1 x Liquid Float Switch
Resources:
Python library
Introduction to Buttons and Switches
Types of buttons and switches
This waterproof ultrasonic distance sensor is for those applications that are a bit more rugged! 25cm - 450cm sensing range.
We have used the HC-SR04 Ultrasonic Distance Sensor many times and for many good reasons. It is pretty easy to use, it performs well, and it is very inexpensive. For collision avoidance robots or intruder detection, this sensor is usually all you’ll need.
However, using the HC-SR04 outside is a different story. It is a pretty fragile device and can easily be damaged by dirt, or even high winds. And, above all, it is not waterproof.
For these circumstances you can use this sensor, in more weathered states, even outdoors
Specifications:
Operating voltage: DC 5V
Total current work: 40mA
Acoustic emission frequency: 40khz
Maximum distance: 4.5m
Blind: 25cm
Wiring:
5V (positive power supply)
Trig (control side) RX
Echo (the receiver) TX
GND (negative)
Resolution: about 0.5cm
Angle: 70 degrees
Working temperature: -10 ~ 70 ℃
Storage temperature: -20 ~ 80 ℃
Product Features:
- small size, easy to use;
- low voltage, low power consumption;
- high accuracy;
- strong anti-jamming;
- integrated with wire enclosed waterproof probe, suitable for wet, harsh measuring conditions.
Application:
1 Horizontal distance;
2 obstacle avoidance, automatic control;
3 traffic control;
4 security, industrial control;
5 artificial intelligence, and research
Basic working principle:
(1) using IO port TRIG trigger location, to the high level signal of at least 10us;
(2) module automatically sends 8 40KHz pulse, automatic detecting whether a signal returns;
(3) on signal return, a high level is output through the IO port ECHO, the time duration of the high level is ultrasonic from launch to return. The test distance = (high level time * speed of sound (340M/S)) /2;
Usage
Package Includes:
1 x DC 5V Waterproof Ultrasonic Module Distance Measuring Transducer Sensor
The 1/2" 2 way, 90 Degree, 2 port 12 V DC NPT Normally Closed Electric Solenoid Valve converts electrical signals to pneumatic functions as part of a larger system that allows users to interlock, isolate, and connect individual units of a larger operation.
DC 12V Electric Solenoid Valve 1/2 Inch Hose Magnetic Water Air Inlet Flow Switch
Specification:
Material | Metal Plastic |
Color | As per picture |
Voltage | DC12V |
Rated Power | 5W |
Pressure | 0.02- 0.8Mpa |
Interface Modes | 1/2'' Hose |
Working Time | 5 hours at once (Max) |
Insulation Class | E |
Fluid Temperature | 0-90°C |
Size | L*W*H/75*60*45mm/2.95*2.36*1.77'' |
Inner diameter | 14mm/0.55'' |
External diameter of thread | 20mm/0.78'' |
1 x Electric Solenoid Valve
Please note:
The actual valve size in the unit is smaller than the port size as you will find with most taps.
This is made of PP material and it is water proof, damp-proof, temperature resistance,insulation and good thermolysis.
Solenoid valves are efficient and durable providing a cost effective and reliable method of controlling water flow in a wide range of uses; from irrigation, where they are suitable for watering large areas such as sports grounds, municipal gardens, agricultural and small gardens, to applications in water-saving devices, water treatment and general industry.
Specifications:
- Material: PP
- Voltage: about 12V DC
- Rated power: about 5W
- Operation model: normally closed (N/C)
- Pressure: about 0.02 - 0.8Mpa
- Port size: about G3/4
- Fluid temperature: about 0-100 degrees Celsius
- Usage: water and low viscosity fluids
- Flow characteristics:
- about 0.02Mpa>2L/min;
- about 0.10Mpa>10L/min;
- about 0.30Mpa>16L/min;
- about 0.80Mpa>28L/min
Package Includes:
1 x Solenoid valve
Please note:
The actual valve size in the unit is smaller than the port size as you will find with most taps.
Screw terminals instead of solder tabs, very convenient and easy to install. High round head is easy to press especially for someone with larger fingers. Stainless push button is made of high quality metal material for long term use. Switch with rubber O-ring and IP65 waterproof protection for use in wet or dusty environments.
Push it: on, Release it: off. That is the description of “Momentary”. (It is basically similar to a door bell ringer button)
Mounting Cut Hole | Φ16mm |
Head Diameter | Φ18mm |
Operating Stroke | About 2.8mm |
Operation Type | Momentary (Self Return) |
Switch Contact | 1NO (Normally Open) |
Head Shape | Flat |
Max Switch Rating | 3A/250VAC |
Material | Nickel plated Brass |
Protection Rating | IP67/IK08 |
Operation Temperature | -20℃~ 55℃ |
Panel Thickness | 1-10mm |
Color | Silver |
Quantity | 1pcs |
Uses a certain action force to connect the contacts through a certain travel to make circuit conversion. With the characteristics of instantaneous action and small travel between small contacts.
Widely used in various electronic products, instruments and apparatus, and home appliances etc. fields.
- Waterproof Boot
- Model: E-TEN1021
- Sizes:29 x 16 x 56mm
- Style: On-Off
- Power: 15A 250VAC
- Connector Type: SPST
- Material(External): Metal
- Dielectric strength: 1000 V RMS (min)
- Insulation resistance: 100 Mω(min)
- Basal material: Poly propylene materials
- Mechanical life: More than 50.000 cycles
- Electrical life: More than 10,000 cycles
- Environment temperature: - 25 degrees ~ 80 degrees
- Vibration: 10 to 55Hz, 1.5 mm double amplitude
1 X SPST 2Pin Heavy Duty15A 250V ON/OFF Rocker Toggle Switch Waterproof Boot
Resources:
Introduction to Buttons and Switches
Types of buttons and switches
A float switch detects the level of a liquid in a tank or container. It floats on top of the liquid surface and acts as a mechanical switch as the liquid level goes up or down. They control devices like pumps (pump water in or out), valves (open or close inlet/outlets), or alarms to notify users.

Specifications:
Shape: Square
Contacts: NO NC
Rated voltage: 250V(380V)
Rated current: 8A(4A)
Working temperature: 0℃<=water temperature<=65℃
Mechanical endurance: ≥100,000times
Electrical endurance:≥50,000times
Cable length: 1.9m / 74"
Environment: pool, water tank/dam
Control level difference > 40cm
Features:
Easy to use, easy to install,
Safe, reliable, maintenance-free, non-toxic and environmentally friendly.
Package includes:
1 x Float Switch Liquid Level Controller Sensor
Rainproof performance, making it more suitable for outdoor weather conditions. To turn on or off the light in day and night without manual operation.
Adjustable sensitivity and photoreceptor
Do not install the control unit in a place extremely darker in daytime, or a place directly by lighting of turning - ON lamp.
Common uses: street light, highway, factories, garden, ports, airports, farm, parks, schools, and other places.
Specifications:
Product: light control sensor
Power source: 220V
Rated Current: 10A
Ambient temperature: max 55 (C)
Package includes:
1 x 220V 10A Waterproof Automatic Light Sensor Controller for eg. Garden Lights
A safety device consisting of a strip of wire that melts & breaks an electric circuit if the current exceeds a safe level.
Waterproof your electrical connection using this fuse holder. A safety addition to your 3D printer, CNC and several other electronics
Specifications:
Suitable for 6v, 12v & 24v systems (Maximum voltage 32v)
Package Includes:
1 x Standard Blade Fuse holder
1 x 10A Blade Fuse included
When the soil moisture is lower than preferred setting, the relay will automatically pull in, start the sprinkler, water pump etc. until the moister reaches the desired humidity level and automatically stop.
Product use: Through the potentiometer, adjust to the desired soil moisture level
Specifications:
Electrical parameters: Supply voltage: 12VDC
Input current: more than 100mA Relay Load Max: 10A 250V AC or 10A 30V DC
Module instruction:
1 sensors applied to the detection of soil moisture; Module
2. Blue potentiometer is used to adjust soil moisture level, clockwise adjustment and control the humidity will be bigger, counterclockwise smaller; 3. Due to module delay function, adjust the humidity value, wait about 5-8 seconds, see if the the relay state changed, the green LED lamp will also have corresponding change, until adjusted to meet the requirements.
Package Includes:
1 x Soil moisture control module
1 x Soil sensor
2 x 20cm long DuPont lines
Connector socket for 5.5mm x 2.1mm DC Jack
Panel mount
What's in the box?
1 x socket plug
This sensor works by having a series of exposed traces connected to ground and interlaced between the grounded traces are the sens traces. The sensor traces have a weak pull-up resistor of 1 MΩ. The resistor will pull the sensor trace value high until a drop of water shorts the sensor trace to the grounded trace.
For all Grove users (especially beginners), we provide you guidance PDF documents. Please download and read through Preface - Getting Started and Introduction to Grove before your use of the product.
Believe it or not, this circuit will work with the digital I/O pins of your Arduino or you can use it with the analogue pins to detect the amount of water induced contact between the grounded and sensor traces. Suitable to detect rainfall, tank overflow, water leakage.
You can get grove HAT for Raspberry Pi or if you want to use this module with Arduino board, you can get grove shield for Arduino. Also great for the Maker Pico board with grove adapters
Note: Controllers are not included.Features and specifications:
- Grove compatible interface
- Low power consumption
- 2.0cm x 2.0cm twig module
- High sensitivity
- Can be use for rainfall detecting, liquid leakage, tank overflow detector
- Working Voltage: 4.75V to 5.25V
What's in the box?
1 x water/rain sensor
1 x grove connector
The YouPin Flower Monitor could not be compatible with some Lenovo smart phone;
Product Features:
Easy and convenient to use and operate
Provide a healthy growing environment for all plants
Easily check on the condition of your plants
Can recognize different kinds of plants via smart phone
Open Bluetooth and connect smart home APP to manage your plants
Product Description:
Download the "flower care" app from the app store and connect the device. Plug & Play basically.
Brand : YouPin
Item : YouPin Flora Monitor
Wireless connections: Bluetooth 4.1 BLE
Operating voltage: 3V
Battery: CR2032 button battery (included)
Function:
Waterproof design around battery compartment;
IP5 Waterproof grade: anti spray type waterproof, any direction directly by the water jet, no harmful effects;
Nutrient testing, soil moisture detection, temperature detection, light detection;
Precise detection of light and temperature water and fertilizer;
Cloud Plant Database;
Phone Bluetooth connection.
What's in the box?
1 x HHCC flora sensor
Brian shows how he connected it to RPi4
https://brianp.de/posts/2020/plant-monitoring-xiaomi-miflora-rasperrypi-grafana/
This product is made of plastic, and is not only waterproof, but also oil proof. Self-locking for on push button, automatic reseat for off push button.
Convenient to use and very durable. Easy to install and good looking.
- Material : Plastic
- Current : 10A
- Voltage AC : 250V/380V
- Size : 90 x 56 x 50mm
- ON push button : self-locking
- OFF push button : automatic reset.
- Waterproof design.
Resources:
Introduction to Buttons and Switches
Types of buttons and switches
Miniature peristaltic pump

Features:
Applicable power supply: DC 12V
Working environment: temperature 0-40℃, relative humidity < 80%
Flow direction of medium: the flow direction of peristaltic pump depends on the positive and negative stages of power supply. The terminals can choose the positive and negative stages at will
Equipped pump pipe (IDxOD) : 3x5 (inside diameter X outside diameter)
Flow range: 9ml/min -150ml/min
Speed range: 0.1-60 rPM
Current: 250-300 ma
Motor ruler: diameter 32 x height 23(mm)
Center distance of mounting hole: 48.5mm
Weight of mini peristaltic pump: 0.15kg
What's in the box?
1 x peristaltic pump
- 1