Automatic Wake-Up Experience. Group 40 William Bendix, Jake Metz, & Durreh Tabassu ECE 445 Senior Design April 29, 2010. Introduction. The Automatic Wake-Up Routine provides an automated approach to the daily, morning tasks taking them out of the hands of the end user
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Automatic Wake-Up Experience
William Bendix, Jake Metz, & Durreh Tabassu
ECE 445 Senior Design
April 29, 2010
7 segment displays
BCD to Seven segment converters
Schematic for the thermostat
Schematic for the Blinds Circuit
Thermostat and the Blinds Circuit
Duty cycle changing between 30%-100%
Frequency : 125kHz
Period: 8.0 us.
1) Test the motor control by manually running the motor without the PIC by using a function generator. 2) Test the wireless control of motors by sending signal to PIC 3) Battery capacity check a. Use a multimeter to test battery voltage levels b. Run the motor for 5 minutes (corresponding to 2 motor runs per day at 5 sec/run for 30 days) c. Check the Battery voltage level again
Longevity of Power Supply
The thermostat and the blinds circuit would be powered separately using 4AA batteries. Considering the motor to run for 5seconds a day, its power consumption is summarized in the table below.
Average capacity of 4AA batteries = 2.4VAh
Even after considering the negligible power consumed by the thermostat and the other parasitics of the circuit we can see that our battery power would easily last for a month.
Uses a 315 MHz signal that is Modulated using on off keying
Transmission: Transmission power: Pt = 10 mW distance: r = 30 m Receiver power: Pr = -110 dBm frequency: f = 315 MHz Power per unit area: S = Pt/(4*pi*r2)= 8.84 x 10-7 Pr = 10-110/10=10-11mW Effective area: Aeff = Pr/S = 10-14/8.84 x 10-7 = 1.13 x 10-8 m2 wavelength = lambda = c/f = 3 x 108/315 x 106 = .9517 m Antenna Gain: Aeff = lambda2*G/(4*pi) G = 4*pi*1.13 x 10-8/.95172 = 1.57 x 10-7
Our calculations show that the required Gain for the antenna is far below a value that a typical antenna would be expected to have
Serial Data In