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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects edge of the signal, it stopped the timer. The timer value reflected how many instruction cycles it took the microcontroller to read the high time of the incoming signal. Knowing that the microcontroller operated at a frequency of 48 MHz and executed 4 instructions per clock cycle, the timer value was converted to a time. Figure 92: Logic to arming microcontroller Once the microcontroller was armed it then reads the incoming signals, using the CCP pin as before, from the aileron, elevator, and rudder. To avoid accidental store release, there is a time delay of three seconds between arming the microcontroller and the microcontroller reading the incoming signals. The inputs for these control surfaces are similar to how the switch works. On the transmitter there are two sticks that produce various PWM signals depending on their position. For instance, moving the left stick to the far left causes the rudder signal to have a high time of 1.0 ms or duty cycle of 5% and moving it to the far right gives the rudder a signal with a high time of 2.0 ms or duty cycle of 10%. Based on the signals, the appropriate payload is released. The flowchart of this process is shown in Figure 93. Every time the microcontroller is armed it goes through this sequence once and then returns to the arming routine. Code for the Microcontroller can be observed in Appendix K. Figure 93: Flowchart for releasing payloads 114
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects 11.0 Integration Plan Author: Mark Findley Co-Author: Eric Hall 11.1 Aircraft Overview The Buff-2 Bomber is composed of four main mechanical sub-assemblies: wing, structure, propulsion, and avionics. The following chapter details the integration plan of the major components into the four sub-assemblies and then the integration of the sub-assemblies into the complete aircraft. Figure 94 below shows the assembly flow diagram for the construction of the CUDBF aircraft. Figure 94: Assembly Flow Diagram 115
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PFR - Aerospace Engineering Sciences Senior Design Projects ...

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