SEGmeter

Their objective is to provide a low cost, open source energy measurement platform in kit form to allow the makers and hobbyists to follow a step by step guides to build, commission an energy measurement and efficiency solution that is internet connect-able to the smartenergygroups.com website, allowing the analysis of energy usage data and the ability to smart control devices based on rules and schedules.

Inputs

6 Analog inputs with 6 low pass filter circuits,

note, a non populated low pass filter will allow alternate analog inputs.

Digital input for a one wire temperature sensor on pin 5

Digital outputs

A single channel onboard reed relay to enable the switching of low power circuits from the Arduino on pin 7

Power Interfaces

On board regulator to take the Arduino supply voltage, in the range of 12-5V down to 3.3V capable of supporting the power requirements of a 900MHz Zigbee.

Serial interfaces

4 Pin interface for serial connection breakout to enable direct connection to an Asus Router, with pinout on the shield being, 5V – RX – TX – GND.

note: to use this config for direct connection to an Asus Router, the Router will need to be wired up for 5V, not 3.3V and power from the router will power the Arduino. Other router models are supportable with a suitable adaptor cable connecting the relevant pins.

4 Pin serial daisy-chain interface with pinout being, Pin 0 Rx – Pin 1 Tx – Pin 2 Rx – Pin 3 Tx

This will enable downstream arduino's to send and receive on pins 2 and 3.

Zigbee Interface

Enable direct plug in of a MaxStream 20 pin type Zigbee directly onto the shield. This will includes level shifting of logic signals to 3.3V

Watchdog

Supports a watchdog circuit, to be implemented by the maker capable of resetting the Arduino.

Indicators

Red Power LED to indicate power is being supplied to the arduino

Yellow Status LED on pin 13 to indicate normal operation of the arduino

Red Relay Status LED on pin 7 that will light when the relay is closed

Form Factor

The form factor for the shield shall be the same footprint as that of an Arduino Duemilanove. The Sparkfun Arduino-Pro 5/16Mhz is the preferred low cost Arduino platform.

Prototyping Area

Because they are making open hardware, they provided a small prototyping area for people to get imaginative and build some other magic into their SEGmeter. Examples could include a shift/latch to support an LCD display.