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Duties of construction managers Training for construction managers Certi cation for construction managers Salaries for construction managers and contractors Job outlook for construction managers Duties of cost estimators Training for cost estimators Certi cation for cost estimators Salaries for cost estimators Job outlook for cost estimators Sample job listing Firsthand accounts

BR1 diode bridge rectifier 100v/2-amp T1 U1 S1 PL1 24 volt center tapped transformer -5 A LM7809 IC regulator 9 volts SPST power switch 115 VAC power plug

D1,D2 1N914 silicon diode D3 X1 U1 U2 1N4001 silicon diode 10 MHz crystal SCL006A magnetometer output IC AD-557 - digital to analog converter chip

s the automobile the most significant invention of the twentieth century It s hard to argue that anything else came close from 1900 to 1950 Even in this era of genetic coding and medical breakthroughs, global positioning systems and digital technology, millions of people around the world use their cars as gateways to personal freedom and often as extensions of their personalities For thousands, automotive admiration becomes something more than just a means of transportation; it becomes a passion The respect for, knowledge of, and wish to own or work with a particular car, a group of cars, or fine cars in general, may transcend the bounds of ordinary people s reason These passionate souls are car buffs, or motorheads, and they live in a state we call automania

he author would like to thank the following professionals for providing information about their careers: Joel Andr , architect Peter Benton, architect Greg Blackwell, landscape architect/interiorscaper Kent Brinkley, landscape architect/garden historian David DiCicco, architect John Downs, professor Gary Fischer, architect George Hallowell, architect Julie Haney, architect Jasper (Joe) Hardesty, architect Steve Lazarian, licensed general contractor Judy Moore, architect Harvey Schorr, architect Lee Sullivan Hill, cost estimator Maggie Shannon Wagenaar, civil engineer Matthew I Zehnder, landscape architect/regional planner

MISC PC board, wire, hardware, etc 1 Speake & Co Ltd (Elvicta Estate, Crickhowell, Powys Wales, UK; http:// wwwspeakesensorscom)

Theory of operation The SRF04 works by sending a pulse of sound outside the range of human hearing This pulse travels at the speed of sound (11 ft/ms) away from the ranger in a cone shape If any objects are in the path of the pulse, the sound is reflected off the object and back to the ranger The ranger is paused for a brief interval after the sound is transmitted and then awaits the reflected sound in the form of an echo The controller driving the ranger requests the device to create a 40-kHz sound pulse, and then waits for the return echo If the echo is received, the ranger reports this echo to the controller, and the controller can then compute the distance to the object, based on the elapsed time Connections The ranger requires four connections to operate The first two are the power and ground lines The ranger requires a 5-volt power supply capable of handling roughly 50 mA of continuous output The other two lines are the signal connections The first signal connection is the pulse trigger input line, and the second is the echo output line These two pins will be connected to two input/output (I/O) lines of the microcontroller Figure 714 shows the connection pins on the back of the device Note that the ground pin is on the far right and is marked with the letter G beside it

Basic timing There are a couple of requirements to consider about the input trigger and the output pulse generated by the ranger The input line should be held low (logic 0), and then brought high for a minimum of 10 sec to initiate the sonic pulse The pulse is generated on the falling edge of the input trigger The ranger s receive circuitry is held in a short blanking interval of 100 sec to avoid noise from the initial ping, and then it is enabled to listen to the echo The echo line is logic low until the receive circuitry is enabled Once the receive circuitry is enabled, the falling edge of the echo line signals either an echo detection or the timeout of 36 ms if no object is detected Figure 715 illustrates the timing sequence of the initial trigger input, the 40 kHz sonic burst that is generated, and the echo output pulse