This document describes a basic home automation system prototype using a Raspberry Pi and Arduino. The system includes hardware devices like sensors to detect light, temperature, humidity, water levels and an RFID reader. The Arduino codes reads the sensors and controls devices like LED lights and a servo motor. The Raspberry Pi runs Python scripts to save sensor data to a MySQL database and control devices via PHP scripts triggered by the sensor readings or user input.

1. Home Automation System
Basic modern connected devices home
automation system prototype

2. Hardware Devices
●
Raspberry Pi 2 Model B
– Servo Motor
– RC522 RFID Reader
●
Arduino UNO (rev3)
– Liquid Level sensor
– DHT11 Humidity and Temperature sensor
– Light Dependent Resistor Sensor
– 5v Relay
– LED strip
– Bluetooth HC-06 Module
– LCD Display

3. Other Hardware resources
● Jumper wires
● Breadboard
● 9v battery
● USB to mini-usb cable
● Ethernet cable
● Router
● Mobile power connector

4. Arduino wiring connection
Liquid sensor
Temperature
& Humidity
LDR LCD Display Bluetooth
G
Arduino UNO Micro-Controller
5v
A0 A1 A2 RXTX
D135v GND
Relay
LED Strip
9v
battery
A3 A4 A5

5. RaspberryPi connections
Raspberry Pi 2 model B
Servo RC522 RFID
● Servo Motor
– Red → 5v
– Black → Ground
– Yellow → GPIO 12
● RFID Reader
– SDA → GPIO8
– SCK → GPIO11
– MOSI → GPIO10
– MISO → GPIO9
– IRQ → None
– GND → GND
– RST → GPIO25
– VCC → 3.3v
Arduino UNO rev3

6. Arduino Code
● Print LDR value as ldrval
● Print temperature as temperature and
humidity as humidi
● Print water level as wtrlvl
● Get input as “n” to switch light On and “f” to
switch light off
● Print water level and temperature on LCD
display

7. Python Scripts
● py.py to read Arduino serial port and save
sensor values to mysql database .
● on.py to switch on lights
● Off.py to switch off lights

8. Bash script
● Make servoBlaster (library) executable and set
PIN to GPIO12 .
● Servo.sh to set servo motor ( gate close )
● Servoup.sh to open gate

9. Php script
● Port.php to check arduino serial port
– Need to run py.py
● Table.php to create database tables.
● Servoup.php to open servo gate
● Servodown.php close servo gate
● on.php to light strip on
● Off.php to light strip off
● Data.php to get json format sensor data
*All of these should be revamp to calling API formats to devices.

10. Thank you
ruwanranganathz@gmail.com