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Lesson 45: Plant Monitor

This project intelligently automates plant watering by triggering a water pump whenever the soil’s moisture level dips below a predetermined threshold. It also features an LCD display that showcases the temperature, humidity, and soil moisture levels, offering users valuable insights into the plant’s environmental conditions.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Arduino UNO R3 or R4	BUY
Breadboard	BUY
Power Supply Module	-
I2C LCD 1602	BUY
Centrifugal Pump	-
L9110 Motor Driver Module	-
Capacitive Soil Moisture Module	BUY
Temperature and Humidity Sensor Module (DHT11)	-

Wiring

Note

The kit may contain different versions of the DHT11 module. Please confirm the wiring method according to the module you have.

Code

Code Analysis

The code is structured to seamlessly manage plant watering by monitoring environmental parameters:

1. Library Inclusions and Constants/Variables:

   Incorporate Wire.h, LiquidCrystal_I2C.h, and DHT.h libraries for functionality. Specify pin assignments and settings for the DHT11 sensor, soil moisture sensor, and water pump.

2. setup():

   Configure pin modes for the moisture sensor and pump. Initially deactivate the pump. Initialize and backlight the LCD. Activate the DHT sensor.

3. loop():

   Measure humidity and temperature via the DHT sensor. Gauge soil moisture through the soil moisture sensor. Display the temperature and humidity on the LCD, then show soil moisture levels. Assess soil moisture to decide on water pump activation; if soil moisture is under 500 (adjustable threshold), run the pump for 1 second.