Presentation given at Nanode Applications Weekend in London. Presentation introduces the OpenEnergyMonitor project and talks through our end-to-end open-source web-connected energy monitoring system Blog post about the event: http://openenergymonitor.blogspot.com/2011/08/nanode-applications-weekend.html

1. Nanode applications weekend, London
06/08/2011 Glyn Hudson and Trystan Lea

2. Contents
● OpenEnergyMonitor project
● emonTx
● RFM12B wireless module
● emonGLCD
● Nanode RF
● emonCMS

3. “A project to develop and build open-source energy
monitoring, control and analysis tools for energy efficiency
and distributed renewable microgeneration”

5. http://openenergymonitor.org/emon/emontx
Applications
● Electricity consumption monitoring
● Renewable generation monitoring
● Heat-pump monitoring
●Water, gas and flow monitoring (from pulse
output meter)
● Temperature monitoring
● Multi node distributed monitoring network

6. DS18B20 one-wire
Optional AC voltage temperature bus Pulse counting
(for real power
measurement)
Status LED
(upside down!)
JeePorts for
compatibility with
JeeLab shields 3 x CT channels
3.5mm jack for
Atmega 328 @ 3.3V Seedstudio CT's
100A max
AA battery input
(3.3V max)
5V USB RFM12B
5V FTDI power Wireless
Arduino IDE
compatible
http://openenergymonitor.org/emon/emontx

7. RTC plug
16Ch PWM LED plug
Barometric pressure plug
Motor plug
Infra red plug
MOSFET plug
Light intensity plug 512Kb memory plug
OOK plug
Relay plug

8. https://github.com/openenergymonitor/emonTxFirmware
https://github.com/openenergymonitor/NanodeRF
In development!

9. RFM12B wireless FSK transceiver module
●Made by Hope RF, re-branded by rfsolutions and maplin in the UK
●Sometimes called 'Alpha RF'
●Low cost RF transceiver £4-7 (from Rapid, Farnell, RS or Maplin)
●Up to 300m transmission
●Up to 115Kbps
●Up to 28 nodes per network
●Up to 250 different network groups
●3 different frequencies
●Surface mount
●SPI interface
●2.2-3.8V supply voltage
OpenEnergyMonitor uses 434Mhz
●Low power – 0.3µA standby current JeeLabs uses 868Mhz
●Excellent interrupt driven Arduino library by JCW
http://jeelabs.net/projects/cafe/wiki/RF12
http://www.hoperf.com/pro/rf/cob/RFM12B.htm

10. RFM12B wireless transceiver module
Simple Tx code – (update: see url:)
https://github.com/openenergymonitor/RFM12B_Simple

11. RFM12B wireless transceiver module
Simple Rx code
(update see url:)
https://github.com/openenergymonitor/RFM12B_Simple

12. RF
http://wiki.hackspace.org.uk/wiki/Project:Nanode/Applications#RFM12_Wireless_Module
●JeeLabs RFM12B wireless breakout board.
●No need to solder in the 3.3V voltage regulator
●3.3V power from the Nanode's 3.3V voltage regulator
433Mhz needs longer antenna (165mm) than JeeNode 868Mhz
There is an error on the Nanode 5 board that stops the
Ethernet and RFM12B being used at the same time.
Solution:
●Lift leg 4 of the ENC28J60 out of its socket
●Do not solder in/remove R13 (the 10K resistor, one resistor
down from the 1 ohm ferrite)

14. emonGLCD
wireless open-source
graphical LCD unit
In development
A beautiful living room display!
..think smooth laser-cut and engraved plywood fascia....
●64x128 Graphical LCD
●PWM LED backlight
●Low power, 3.3V
●Based on JeeNode + JeeLabs
Graphics board
ATmega328 Temperature sensor tri-colour LED (ambient indicators)
Possible uses
●Energy monitoring
● Real time data
Mode
● Simple graphs
change
● Ambient indicator LED's
● Grid demand / renewable mix
● Temperatures
USB
power
●Twitter feeds, weather, email alert,
RSS etc.
●Patchube feeds
RFM12B

15. RF
Nanode to the web
https://github.com/openenergymonitor/NanodeRF
https://github.com/openenergymonitor/sketchbook
A whole load of examples for sending data to pachube and emoncms from the nanode.

16. An open-source web app for processing, logging
and visualising energy, temperature and other
environmental data.
●Open-source, downloadable and installable on
your own server.
●Specifically designed with processing and
visualising energy data in mind.
A project for me to learn web programming, php,
●
mysql, javascript and so on
openenergymonitor.org/emon/emoncms

17. Home energy dashboards, heatpumps, solar hot water

19. Input processing
Inputs Feeds
Power Power
power
kWh/d
to kWh/d
Scale, offset
Temperature Temperature
x 1.1 + 0.2
Voltage
x input Power
Current

20. The code
https://github.com/openenergymonitor/emoncms2
https://github.com/openenergymonitor/emoncms2_extras
Architecuture: Model-View-Controller
Languages: PHP, MySQL, Javascript,
JQuery, Flot based graphing
Requirements: A server running
Apache MySQL and PHP

21. Models are like libraries in that
you can call the model functions
from your code:
create_feed($userid,$name)
insert_feed_data($feedid,$time,$value)
update_feed_data($feedid,$time,$value)
get_feed_data($feedid,$start,$end,$resolution)
The controllers handle
different requests from
the user, getting data
from the model and
wrapping it up in a view
before sending finished
output to the user.
The controller, controls
data flow through the
application.
The views theme
the data/content

22. a 3rd party pachube app?
By swapping out the database
and changing the models slightly
it should be possible to use pachube
as the data store