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The SAE is an excellent resource for technical information and expertise used in designing, building, maintaining, and operating self-propelled vehicles for use on land or sea, in air or space You can find a lot of information pertaining to jobs available, meetings and exhibitions, and professional development opportunities on the website

After completing the internship period, intern-architects are eligible to sit for the ARE The examination tests candidates on architectural knowledge and is given in sections throughout the year Candidates who pass the ARE and meet all standards established by their state board are licensed to practice in that state After becoming licensed and gaining experience, architects take on more duties and manage entire projects In large rms, architects may advance to supervisory or managerial positions Some architects become partners in established rms, and others set up their own practice Several states require continuing education to maintain a license, and more states are expected to adopt mandatory continuing education Requirements vary by state but usually involve the completion of a certain number of credits every year or two through seminars, workshops, formal university classes, conferences, self-study courses, or other sources

then bounces back Since we know that sound travels through air at approximately 1129 feet per second when the temperature is 21 degrees Celsius, we can accurately determine distance by measuring the amount of time between the transmission of the pulse and the return echo When the temperature drops, the speed of sound through air slows down If a temperature sensor was added, an algorithm to determine distance based on the speed of sound through air could take the surrounding temperature into account and adjust for differences The PicBasic Pro command called PULSIN returns the round trip echo time in 10 s units when using a 4-MHz oscillator Since the pulse width has a 10 s resolution per increment, that means that if PULSIN returns a value of 1, then 10 s have elapsed The factors to convert the raw data to inches and centimeters given in the SRF04 manual are 74 for inches (73746 s per 1 inch) and 29 for centimeters (29033 s per 1 cm) based on the Basic Stamps PULSIN command returning values in 2 s increments In the SRF04 manual, the calculation to determine the distance is not divided in half to take into account the return time of the pulse because the sample program is for the Basic Stamp II, which returns PULSIN values in 2 s increments Because the PULSIN command with PicBasic Pro is returning values in increments of 10 s, the conversion factor will need to be divided by 5, so that we get the correct value based on our 10 s increment Taking the PULSIN increment timing difference into account gives us an approximate conversion factor of 15 for inches and 6 for centimeters Testing with the ranger indicated that the raw value returned by PULSIN when an object was 12 inches away was 180 One hundred and eighty divided by the inch conversion factor of 15 gives us the correct distance of 12 inches In order to test the SRF04 sonar ranger, a program will be written to produce audible tones, based on the distance of an object from the device Compile the sonar-testbas code listed in Program 75,.

and then program the PICmicro MCU 16F84 with the sonar-testhex file listed in Program 76 When the PIC is inserted into the 18-pin socket on the main controller board and power is applied, move your hand slowly toward the ranger and notice that the tones produced by the PIC get lower the closer your hand gets to the device If no tones are produced when power is applied, then check to make sure that none of the connections from the sonar module to the controller board have been mixed up

'-----------------------------------------------------------------------------------------------------------------------------' Name : sonar-testbas ' Compiler : PicBasic Pro - MicroEngineering Labs ' Notes : Program control of the Devantech SRF04 ' : ultrasonic module Convert the raw distance ' : data to a frequency and output to the piezo ' : element '-----------------------------------------------------------------------------------------------------------------------------' PortA set as outputs Pin 1 input trisa = %00000010 ' PortB set as outputs trisb = %00000000 '-----------------------------------------------------------------------------------------------------------------------------' initialize variables trigger echo piezo dist_raw dist_inch dist_cm freq conv_inch conv_freq VAR PORTA0 VAR PORTA1 VAR PORTA3 VAR WORD VAR WORD VAR WORD VAR WORD CON 15 CON 6