Amey Rane Madhur Srivastava Tejas Pandit Varun Sivakumar

Success Criteria [PSSC] An ability to measure power consumption of plugged-in devices over time An 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 remotely An 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 Microcontroller (Adapter) Microcontroller (Base Unit) Current 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 adapters Low power microcontrollers for the adapters Accurate current sensors for correct power measurement Zero crossing relays for switching inductive loads RF integration with the microcontroller for remote/base unit communication

Constraints for base station LCD with VGA port to interface with the Intel Atom board Touch screen with the same dimensions as the LCD screen and a USB interface Microcontroller with inbuilt transceivers to communicate with the adapters Ability to connect to the internet

Atmel Microcontroller MicrocontrollerATMEGA128RFA1 # of pins64 # of I/O pins38 Program Memory (kB)128k(Flash) 4k(EEPROM) RAM (kB)16k TX/RX Byte Frame Buffer 128 Power Consumption16mW DocumentationYes Priceprocessing for sample

Adapter circuit elements Solid State RelayOpto 22 – 120D25 Carlo Gavazzi – RA 2410LA Optical IsolationYesNo Zero SwitchingYes Control Voltage3-32 Price$26.50$36 Current SensorTamura - L18P***D15Allegro - ACS710 Output Voltage4V2.5V Accuracy+-1%+-2.2% Price$12.50$22.00

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