Slides from talk given to IoT London meetup on 28th march 2012

1. mbed based
IoT Gateway
Andrew Lindsay
@andrewdlindsay
IoT London Meetup,
28th March 2012
Project kindly Sponsored by SK Pang Electronics Ltd.

2. The Problem?
 Lots of wireless sensor nodes within your property
 May use multiple gateways or PCs for each solution
 Different wireless communication protocols
 Different end destinations
 Too technical for average person?
 May need to write code

3. A Solution
The mbed based IoT Gateway
Connecting your IoT nodes to cloud based services

4. A Solution
 Single low power wireless gateway
 Operates with 868MHz or 433Mhz nodes
 Xbee, XRF or Wifi module in wireless option socket
 Ethernet or Wifi internet connection
 Realtime clock, updated via NTP
 μSD socket for storing configuration
 Web based management
 Software is Open Source

5. What is mbed?
 Microprocessor development board based on
NXP LPC1768
 Uses ARM Cortex-M3 core
 96MHz clock, 512K Flash, 32K RAM
 I/O includes Ethernet, SPI, I2C
 Digital, Analog, PWM
 Real time clock
 Local filesystem
 Online compiler
 Libraries and code samples
 Off-line tools available

6. mbed Vs Arduino
mbed Arduino
 NXP LCP1768/ARM  Atmel ATmega328P
Cortex M3 core
 96MHz  16MHz
 512K Flash  32K Flash
 32K RAM  2K RAM
 Ethernet  Shield
 Online compiler  Simple IDE

7. Gateway Hardware
Baseboard for mbed module
Provides power and I/O connectors
Ethernet RJ45
μSD card socket
RFM12B Wireless module
RFM22B Wireless module option
Wireless module socket for
Xbee/XRF/WiFly

8. Gateway Hardware
Baseboard for mbed module
Provides power and I/O connectors
Ethernet RJ45
μSD card socket
RFM12B Wireless module
RFM22B Wireless module option
Wireless module socket for
Xbee/XRF/WiFly

9. SK Pang Package
 IoT Gateway package consists of
 mbed and IoT Gateway baseboard
 Black extruded aluminium case with wall
mounting brackets
 Laser cut end panels
 External antenna
 9V PSU
 Ethernet Cable

10. Sensor Nodes
 Jeenodes
 OpenEnergyMonitor
 Custom sensor nodes
 Measure
Temperature, Humidity
Soil temperature
Electricity usage
Air Pressure
Dust particles

11. Software Features
 File based configuration in version 1
 Web based configuration in version 2
 Modular OO design
 No code changes to add new nodes
 Configuration files stored on μSD card
 Can learns about new nodes
 Input from wireless nodes
 Output to Pachube/MQTT
 Open Source
 Available from mbed.org

12. Inputs
RFM12B, either 433MHz or 868MHz
Compatible with
Jeenodes from Jeelabs
emonTX from OpenEnergyMonitor
Custom data formats, V1/V2 including battery status
Extendable
Alternative inputs/outputs
RFM22
Xbee
XRF from Ciseco plc

13. Outputs
Current Outputs
Pachube API V2
MQTT including Pachube MQTT beta
Future Outputs
Xbee
XRF
RFM12B
WiFi

14. Data Routing
 Direct input sensor reading to an output
 Nodes file defines how to decode data
 Routing file defines where readings go
Pachube datastream
MQTT message
 Multiple readings can be batched

15. Web Management
 Simple Management interface via browser
 Configure network parameters, DHCP or Fixed
 Configure output modules
 List known nodes
 Configure nodes
 List known sensors
 Configure sensor outputs
 Still a work in progress

16. Where to next?
 Expand range of input payload types
 Ability to transmit wireless messages
Equipment: fans, pumps, vent openers.
Displays: emonGLCD
 Other cloud based data services
 Community involvement
 Custom hardware without mbed

17. Resources
Some resources used in this project
 www.skpang.co.uk
 mbed.org
 jeelabs.org
 pachube.com
 mqtt.org

18. Thank You
Thanks to SK Pang for providing the IoT Gateway
http://bit.ly/IoTGateway
Questions?