1. LOCAL ACOUSTIC HEROES
RECEIVER
INPUT 40 kHz ACOUSTIC
OUTPUT 8-BIT SERIAL 9600
LCD DISPLAY
POWER 24V AND 12V DC
TRANSMITTER X 4
INPUT SELECT BUTTON
OUTPUT 7 SEGMENT DISP
40 kHz ACOUSTIC
POWER 9V DC
ADVISOR: GEORGE SCHEETS, Ph.D.
TEAM LEAD: ROBERT MCGILVREY, (CE)
DAVID JENNINGS, (EE)
RYAN MCIVER, (CE)
EVAN PETERSON, (CE)
Discussion: Provide a way for an autonomous vehicle to have knowledge of where it is
geographically through the use of an ultrasonic acoustic signal. Transmitters are installed along
the path of the vehicle at desired locations, and they are programmed by pressing a select button
to cycle through nine stations. Each programmed station emits a unique signal with a carrier
frequency at 40,000 hertz. The receiver can then determine which transmitter it currently hears.
The receiver will send the number of the current station down the USB or zero if it does not
detect a station. The protocol is a version of On/Off Amplitude Shift Keying, where the time
delay between 40kHz bursts determines the location.