An Arduino greenhouse can water plants when the growing medium dries, run a fan when conditions call for ventilation, and switch on supplemental lighting as natural light fades. The basic system combines sensors, a controller, and suitably rated relay or motor-driver outputs. Start with the official Arduino Greenhouse Kit for a packaged setup, or assemble compatible components individually.
How Arduino greenhouse automation works
The controller takes readings on a schedule and compares them with thresholds you set. It then switches irrigation, ventilation, or lighting on or off. A useful design also includes hysteresis or minimum run times so small fluctuations do not make equipment cycle constantly, and logging so you can review sensor readings.
The control rule is only as useful as the measurements: sensor placement, calibration, crop requirements, and growing medium all affect what readings mean. Example projects demonstrate patterns, not universal growing setpoints.
Choose a kit or assemble the components
Packaged starting point
Arduino’s Greenhouse Kit lists an MKR WiFi 1010 board, an MKR IoT Carrier Rev2, moisture and temperature sensors, a fan, a water pump, an LED strip, cables, and power hardware. The kit page also lists VOC/CO2 sensing. Check the current kit contents, compatibility, and regional availability before purchasing.
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- Build a Real, Working Smart Farm from Scratch - It’s your gateway to building a fully functional IoT farm. With the ESP32 at its core, you’ll assemble a charming wooden farmhouse, connect 8 sensors and 6 actuators, and bring it to life with code. Monitor real-time data, control devices remotely via WiFi, and see your creation respond to the environment.
- Learn Two Ways to Code - Start with Scratch 3.0 — drag and drop colorful blocks to build logic visually. Then, when you’re ready, dive into Arduino IDE and write real C++ code. Every step comes with clear tutorials and sample code. Whether you’re a complete beginner or ready for a challenge, we’ve got you covered.
- Rich Sensor & Actuator Set for Real Projects - This kit includes 8 sensors (soil moisture, water level, DHT11, PIR motion, light, rain, ultrasonic, button) and 6 actuators (water pump, servo, fan, LED, buzzer, LCD display). You’ll learn how sensors gather data, how actuators take action, and how to connect them all into a smart system.
- Assembly & Coding Made Easy - Worried it might be too hard? Don’t be. We provide step-by-step online tutorials with video guidance and sample code for every single project. The kit comes unassembled (so you get the full building experience), and the code isn’t pre-burned (so you learn to upload it yourself). All you need is 6 AA batteries. No soldering.
- Exquisite Models - You can paint them and customize them to create your very own masterpiece. This is both a craft project and a programming challenge—a truly immersive STEM experience that combines craftsmanship with coding.
Custom build
Separate components let you select and replace sensors and actuators to suit your greenhouse. At minimum, plan for an Arduino board, a soil-moisture sensor, a temperature/humidity sensor, and the switching hardware and power supplies required by your pump, fan, and lights. A light sensor is useful if lighting should respond to natural light.
Before buying, check each component’s voltage, current rating, connector type, and calibration needs. Match the switching hardware to the actual load; Arduino I/O pins are control signals, not motor power outputs.
Rank #2
- 【Upgraded Automatic Watering System】Combine development board with USB download cable, water pump, tubing, soil moisture sensor, 4 channel 5V relay module and jumper wires in one plant watering system, including all component for a whole for Arduino DIY drip irrigating system.
- 【Take Care of Your 4 Plants Anytime】You can have the system to water your 4 plant automatically. Whenever your soil becomes too dry, the pump is set into motion and water flows up the tube and into the pot. You don’t have to worry about your plants while going for vacations.
- 【Development Board】The board comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer.
- 【Capacitive Sensor】Insert it in to the soil around your plants and With a screen and a motherboard, you can talk to your plants. To see if your plants is thirsty, do they need more water to moisten it?
- 【Reliable Support】We have prepared detailed automatic self watering tutorial, includes: guidance manual, demo code, burning tools, necessary class libraries.(All of these are in E-format. You can contact us on Amazon, we will send PDF Document to you at any time.)
Plan the sensors and outputs
| Greenhouse function | Input | Output and control approach |
|---|---|---|
| Irrigation | Soil-moisture sensor in the relevant growing medium | Water pump switched through a suitably rated relay or motor driver when moisture is below a calibrated threshold |
| Ventilation | Temperature and humidity sensor | Fan switched through a suitably rated relay or motor driver according to configured conditions |
| Supplemental lighting | Light sensor | LED strip or other light switched through suitable power-control hardware when natural light fades |
Relays or motor drivers keep the Arduino’s low-voltage control signals separate from the electrical loads. Confirm that the selected module is appropriate for the load and wiring arrangement; do not power a pump or fan directly from an Arduino I/O pin.
Set up automatic irrigation
Soil moisture is the key input for automatic watering. Place the sensor where it represents the root zone you intend to manage, then observe its readings as the medium dries and after watering. Use those observations to choose a threshold for your crop and setup.
Rank #3
- Complete Project-Based Learning Path – Build 13 progressive projects (LED blink → button control → PIR motion sensor → music playback → motorized doors/windows → SK6812 RGB lighting → fan control → LCD display → gas alarm → temperature/humidity monitor → RFID door unlock → Morse code access → WiFi control → mobile APP remote control). Each project builds on the previous one, ensuring you understand both the electronics and the programming logic behind every smart home feature.
- Master Two Industry-Standard Languages – Learn to code in both Arduino C++ and MicroPython with 13 detailed tutorials for each language. Compare how the same hardware behaves under different programming approaches – a valuable skill for any aspiring engineer. Perfect for classrooms teaching multiple coding languages or self-learners who want flexibility.
- Build a Real WiFi-Controlled Smart Home – Assemble the wooden house structure and integrate sensors to create a functioning smart home system. Control lights, fans, door servos, and RGB lighting directly from your mobile APP (iOS/Android) . Experience how IoT works in real life – from manual control to automated responses based on temperature, humidity, motion, and gas detection.
- Comprehensive Online Wiki with No Guesswork – Our detailed online tutorials (also accessible via the packaging) include wiring diagrams, full code explanations, and step-by-step assembly guides for every project. Whether you're a complete beginner or a teacher preparing lessons, the structured content eliminates confusion and helps you succeed from project 1.
- Everything You Need to Get Started – (TIPS: Batteries are NOT Included)This kit includes the ESP32 development board, expansion board, wooden house parts, all sensors and modules (DHT11, PIR motion, gas sensor, RFID, SK6812 RGB, servo motors, fan, LCD1602, etc.), and connection cables. NOTE: 6x AA batteries are required (NOT Included). The kit is unassembled – you'll build it yourself following our online tutorials, making the learning experience truly hands-on.
- Connect the moisture sensor to a compatible Arduino input and check that readings change as the medium becomes drier or wetter.
- Calibrate the threshold for the sensor and growing medium rather than copying a value from an example project.
- Connect the pump through an appropriately rated relay or motor driver and use a separate, suitable power arrangement for the pump.
- Program the controller to run the pump only when moisture falls below the chosen threshold. Add a minimum run time or other anti-cycling rule, and check moisture again before running another cycle.
- Test the pump and water path while supervised; confirm that water reaches the intended plants and does not contact electrical connections.
The Automated greenhouse with Arduino project describes moisture sensing with relay-controlled irrigation and fan outputs. The Greenhouse Automation project also describes irrigation when moisture falls below a configured level. These are implementation examples, not crop-independent thresholds.
Automate ventilation and lighting
Temperature and humidity
A temperature/humidity sensor can provide readings for a fan control rule. The Project Hub greenhouse automation example uses a DHT11 sensor and a four-relay module; it demonstrates one way to connect sensing and switching. Choose a fan threshold based on the plants and the conditions you intend to manage, and locate the sensor so it measures representative greenhouse air rather than a localized hot or damp spot.
Rank #4
- Solar Tracking Kit for Arduino：This kit is based on Arduino. It consists of 4 ambient light sensors, 2 DOF servos, a solar panel and so on, aiming at converting light energy into electronic energy and charging power devices.It boasts a smart phone charging module, a temperature and humidity sensor, a BH1750 light sensor, a buzzer, an LCD1602 display, a push button module, an LED module and others, enriching the tutorial and making the projects more interesting.
- 11 Detailed Online Tutorials ： From simple to complex, guide you step by step. You can either start from those basic ones like learning how to control a signal module or sensor, or aim at a more sophisticated one, the one integrating most of these components.
- High extension：This kit preserve IIC, UART, SPI ports, and extend other sensors and modules;if you are experienced,you can also alter the code or connect it with other sensors or modules through the bulding parts reserved to conduct your own experiments.
- Programmble Starter Kit for Teens, Adults and Professionals|：KEYESTUDIO starter kit is a cost-effective open-source programming device. Only a few simple steps are needed to install it and wire it up, very easy and convenient.it can not only help beginner have a better learning about programming but obtain knowledge about electronics, machinery, controlling logic and computer science.
- About this starter kit: The product is not assembled and the code is not burned before it leaves the factory. We have online tutorials to teach you how to assemble and upload the code. This kit does not include batteries, you need to prepare the batteries yourself.
Natural light and supplemental lighting
A light sensor can trigger supplemental lighting when outside light fades. The Greenhouse Automation example describes this kind of rule. Set the response to suit the growing setup and lighting schedule; the example does not establish a universal light threshold or schedule.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Build in electrical and water safety
- Keep water paths and connections separate from mains wiring, and protect electrical equipment from the greenhouse environment.
- Use relays or motor drivers rated for the connected loads, and fuse pumps and lighting appropriately.
- Provide a manual cutoff so irrigation or other equipment can be stopped without relying on the programmed control loop.
- Use appropriate power supplies for motors and lights; do not draw their operating power from Arduino I/O pins.
- Test each output and its fail-safe behavior before leaving the system unattended.
If the build involves mains voltage, use components and wiring methods appropriate to the installation and have qualified help where needed.
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Add remote monitoring if useful
Remote monitoring is possible through Arduino IoT Cloud with supported Arduino hardware. The official kit uses the MKR WiFi 1010; confirm the hardware and connectivity requirements for the particular cloud features you plan to use. Logging readings locally or remotely can help you spot sensor drift or control behavior that needs adjustment.
What to expect from an Arduino greenhouse
Arduino’s official Greenhouse Project describes a system that “takes care of your plants for you!” Treat that as a project description rather than a guarantee: automation can operate equipment from sensor readings, but it does not remove the need to calibrate, maintain, and supervise the installation. The cited Arduino pages and project descriptions do not establish a specific yield increase, water-saving percentage, energy saving, or reliability figure.
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