Home Automation w/ Arduino and OpenHAB

by Eric Tsai

A Hackaday project that connects two open source projects (Arduino and OpenHAB) to

create a system of connected IoT Smart Home.

Arduino OpenHAB

My Gateway

Arduino – cheap sensor node

$2 – ultrasonic distance $2 – digital temp / humidity $0.50 – light sensor

$2 – PIR presence $2 – sound sensor $6 – smoke, gas

Home Automation Needs

Arduino Field Node:

Wireless transceiver: cheap, long range, low power

Arduino HW design: cheap, battery power option

Open Source

Home Automation Gateway (OpenHAB)

Open Source

Run on low power, RPi

Web interface and mobile app

Rules Engine (If This, Then That)

Actions: email, tweet,

Historize & chart data

Wireless Transceiver ● RFM69HW: 915MHz, $4, over 700ft range!

Battery Powered Design

● Battery efficient design – from LowPowerLab and JeeNode using

MCP1702 for 3.3V

● Sleep = 100uA

Arduino Garage Node

OpenHAB

Arduino Gateway

MQTT Broker (Mosquitto)

RFM69 Wireless

Temp Sensor 79.5

RFM69 Wireless

Ethernet Shield

915MHz, encrypted

Wireless

Ethernet MQTT Publish

79.5

“Garage_Temp 79.5”

Ethernet MQTT Subscribe

“Garage_Temp 79.5”

UI

This is my design

Diagram

MQTT Topic Naming Scheme

MQTT Topic Formation

MQTT Topic Formation

Arduino sketches for RFM Gateway and Ethernet Gateway are on

Github, as well as sketches for all example sensor nodes and

OpenHAB configuration.

http://github.com/homeautomationyay

Credits

● Arduino MQTT library from Nick O'leary

● Arduino RFM69 library from Felix Russo of LowPowerLab.com

● Arduino battery powered schematics from LowPowerLab.com

and JeeLabs.org

● OpenHAB Project and Eclipse Project for Mosquitto.

● Many many forum users on Arduino.cc and Openhab google

group for their help.

Future Plans

Future Plans