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
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
Wall (120V AC) Power Supply Power Supply Wireless Communication Wireless Communication Motion Sensor Screen Microcontroller Relay Appliance Device Current Sensor
STANDBY POWER SAVED Pstandby =3*(.08A*120VRMS )= 28.8W Pa.u.m.s. = (Pstandby/4) W = 4.68W Percent saved = 100% W/28.8W = 83% saved! THE A.U.M. DEVICE Pstandby =3*(.08A*120VRMS )= 28.8W Pa.u.m.s. = 0W W = 2.28W Percent saved = 100% W/28.8W = 92% saved! CUT-OFF POWER SAVED
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
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