a.k.a “THE A.U.M. DEVICE”(PRONOUNCED “OHM”)

By

B. Löwen Gruseck (EE)

Gardy Lacombe (EE)

Michael Sriprashad (EE)

Sponsored by

To save energy Energy sustainability Reduce Phantom Power Reduce unwanted carbon dioxide

emissions Save money

THE A.U.M. DEVICE

THE A.U.M. DEVICE

Eliminate standby power Overall device to be energy efficient Different modes of operations User controlled onboard User controlled wirelessly Accurately calculate power usage

THE A.U.M. DEVICE

3 outlets 120V(RMS) AC 60Hz power input and

output Measures 5A, 120V 75% savings on stand by power 5V DC power for internal devices Calculate power with at most +/- 5%

error At least10 bit wide ADC for power

calculations 2 user interface inputs 100m wireless control

THE A.U.M. DEVICE

THE A.U.M. DEVICE

Wall (120V AC)

 

Power Supply

 

 

Wireless 

Communication

 

Motion SensorScreen

Microcontroller

RelayAppliance Device

Current Sensor

STANDBY POWER SAVED Pstandby =3*( .08A*120VRMS )= 28.8W

Pa.u.m.s. = (Pstandby/4) + 2.28W = 4.68W

Percent saved = 100% - 4.68W/28.8W = 83% saved!

THE A.U.M. DEVICE

Pstandby =3*( .08A*120VRMS )= 28.8W

Pa.u.m.s. = 0W + 2.28W = 2.28W

Percent saved = 100% - 2.28W/28.8W = 92% saved!

CUT-OFF POWER SAVED

THE A.U.M. DEVICE

THE A.U.M. DEVICE

Using the hall effect sensors and magnets; the device can sense which pre set outlet is equipped

There are two pre set outlets The first outlet the device into

standby mode The second outlet sets the device

into sleep mode

THE A.U.M. DEVICE

Outlets turn off when timer runs out User specified countdown Timer overrides Standby Mode Great for chargers or late nights

THE A.U.M. DEVICE

THE A.U.M. DEVICE

Our project worked with very little problems in the end. The modes worked and the peripheral interfaces communicated effectively with the main device MCU

Power Calculations came out to 0-5% accuracy as desired

Some processes were delayed, due to constant interrupts and polling

Streamlined MCU program and more sophisticated Android App would be ways to improve our design

More compact physical and aesthetic housing design