Automated Indoor Irrigation

Table of Contents

• 1) Hardware
  • 1.1) Hardware Requirements
  • 1.2) Hardware Setup
• 2) Software
  • 2.1) Setup Environment
  • 2.2) Code Customization Options
  • 2.3) Running the Digital Calendar and Photo frame

1) Hardware

1.1) Hardware Requirements

• Any 96Boards CE (We will be using the Drogonboard410c)
• LinkSprite Mezzanine
• 1x I2C 16x2 LCD Module
• 1x Soil Moisture Sensor LM393
• 1x Motor controller L298n
• 1x 5v Water Pump
• 1x Pipe: Length and diameter as per requirement
• Connecting wires

1.2) Hardware Setup

• Plugin the LinkSprite Mezzanine on the CE Board.
• Plug in the LCD scree to the LinkSprite Mezzanine as follows:

I2C 16x2 LCD	LinkSprite Mezzanine
VCC	IIC VCC
GND	IIC GND
SDA	IIC SDA
SCL	IIC SCL

• Plug in the Soil Moisture Sensor to the LinkSprite Mezzanine as follows:

Soil Moisture Sensor	LinkSprite Mezzanine
VCC	ADC1 VCC
GND	ADC1 GND
A0	ADC1 A0

• Plug in the L298n Motor Controller to the LinkSprite Mezzanine as follows:

L298n	LinkSprite Mezzanine
VCC	D1 VCC
GND	D1 GND
IN 1	D1 DA
IN 2	D1 GND

• Plug in the L298n Motor Controller to the 5v Pump as follows:

L298n	Water Pump
OUT 1	+5v
OUT 2	GND

• Add bury the Probes of the Soil Moisture sensor in the Pot.

2) Software

This guide assumes that Debian OS is running on a Dragonboard410c. How ever the instructions hold true for other 96Boards CE Boards running Debian.

This project is compatible with other Linux based OS, but they might have to be tweaked accordingly.

2.1) Setup Environment

• Enable spidev as shown here: Enabling SPIDEV on Dragonboard410c

• Build MRAA

• Build UPM

2.2) Code Customization Options

• Calibrate Senor

  • Insert sensor into dry and then wet soil and modify the in_min and in_max values here:
    • line 119: water_level = map(adc_value, 550, 10, 0, 100);
  • Do this till dry soil reads 0% and wet soil reads 100%

• Soil Moisture Percentage

  • The target moisture percentage can also be modified by editing line 127 and 133.

2.3) Running the Digital Calendar and Photo frame

• Build Project:
  • gcc src/pot.c -o pot -lmraa -lupmc-lcm1602 -lupmc-utilities -I/usr/include/upm

The LCD screen should now show the current Pump status and Moisture Level in the soil. And the pump should start pumping water once the moisture level drops.