Well, I like growing my own vegetables.
I discovered Arduino just several months ago and I was amazed by this little board. Before, I tried Raspberry and Python but wasn't inspired by them.
So, after some tries (reaction timer, automated soil sensor, railroad barrier for my son's train) I decided to build something more serious and functional.
Voilà, it's up to you to look at it.
The main structure is a revamped IKEA portable wardrobe. I added styrofoam insulation and built another shelf in the middle. After these I have three shelves. The lowest one is mainly for seed starting: there's a heating mat. The two others are for plants.
Main view, not in focus :)
Air circulation, heating and temperature/humidity measurement are performed by an ABC pipe "furnace." A DHT22 sensor is used to measure temperature and humidity.
The "furnace" and an additional heating element.
Humidity control is done by a small 12V "squirrel cage" fan.
When triggered by the board, it pumps fresh air inside the greenhouse.
An Arduino Nano (compatible board) is at the center of control unit. There's an I2C LCD to show all necessary parameters and status. The IR motion sensor triggers the LCD backlight when there's someone in the area.
The LCD shows: temp., humidity, water level and soil moisture for zone1 and zone2.
There's an RTC relay clock which gives, through a digital pin, a "day/night" reference to the entire system. The inside temperature has two setpoints for "night" and "day" to simulate real conditions. The lights stay on during the "daytime" for about 15hrs.
Not very "top-notch" technical execution but I like gardening more than soldering.
Irrigation system: a rain(snow)water barrel is connected to a two-pump block through an electric valve and a filter. Water level is measured by an ultrasonic sensor. Two capacitive soil moisture sensors monitor humidity and trigger water pumps independently for their respective zone. The irrigation is blocked when water level in the barrel becomes critical and a LED is showing a "low water" warning.
A two-pump watering block
Soil moisture sensor and an irrigation head.
Water level ultrasonic sensor. Thanks to my son for help taking pictures :)
So, basically, this is the project. Please enjoy and ask some questions if needed. I speak also French, Romanian and Russian.