Amey RaneMadhur Srivastava

Tejas PanditVarun Sivakumar

Success Criteria [PSSC]An ability to measure power consumption of

plugged-in devices over timeAn ability to communicate with a base unit using

RF and to upload recorded information on a web server using the Ethernet interface

An ability to turn devices on/off remotelyAn ability to set up intelligent power plans to turn

off devices either after a fixed amount of time or after fixed power consumption

An ability to use touch screen interface to control operating parameters of the power management system

Block Diagram

Micro

con

trolle

r(A

dap

ter)

Micro

con

trolle

r(B

ase

Un

it)Curren

t Sensor

Solid State Relay

Electrical Appliance

Switch

Current inputs

DC Control

RF

Power Source

Intel Atom

Processor

Internet

Ethernet

LCD

RS232

VGA

Touch screen

USB

Base UnitAdapter

Constraints for adaptersLow power microcontrollers for the adaptersAccurate current sensors for correct power

measurementZero crossing relays for switching inductive

loadsRF integration with the microcontroller for

remote/base unit communication

Constraints for base stationLCD with VGA port to interface with the Intel

Atom boardTouch screen with the same dimensions as

the LCD screen and a USB interface Microcontroller with inbuilt transceivers to

communicate with the adaptersAbility to connect to the internet

Atmel Microcontroller Microcontroller ATMEGA128RFA1

# of pins 64

# of I/O pins 38

Program Memory (kB) 128k(Flash) 4k(EEPROM)

RAM (kB) 16k

TX/RX Byte Frame Buffer 128

Power Consumption 16mW

Documentation Yes

Price processing for sample

Adapter circuit elementsSolid State Relay Opto 22 – 120D25 Carlo Gavazzi – RA

2410LA

Optical Isolation Yes No

Zero Switching Yes Yes

Control Voltage 3-32 3-32

Price $26.50 $36

Current SensorTamura - L18P***D15

Allegro - ACS710

Output Voltage 4V 2.5V

Accuracy +-1% +-2.2%

Price $12.50 $22.00