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234 BALLOON TELEMETRY CONTROLLER
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sound CW_aud,(Quiet,Wrd_length) return CWval: 'look up CW code for decimal digits 0-9 lookup Character,(253,125,61,29,13,5,133,197,229,245),Character gosub Morse return ADconv: 'acquire result from MAX187 12 bit serial A/D convertor low CLK 'CLK low before start low CS 'select the convertor pulsout CLK,1 'pulse CLK to start let ADresult = 0 'clear the result register for Index2 = 1 to 12 'count the bits in let ADresult = ADresult * 2 'shift the result pulsout CLK,1 'clock the convertor let ADresult = ADresult + AD 'add the data bit next 'until complete high CS 'deselect the convertor return 'go home with ADresult end
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Listing 17-1 Balloon telemetry program (Continued).
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SN T1, T2 U1 U2 U3 R1 R2 Ra Rb C1 C2, C3 C4 C5 C6 D1 Q1 RY1 Motorola MPX5100A pressure sensor Thermistors, Keystone NTC (Digikey KC002G) Maxim MAX 187 A/D converter BASIC STAMP 2 (original) LM7805 5-V regulator 51-k 1-k
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BALLOON TELEMETRY PROJECT PARTS LIST 235
S1 S2 SVO BATT Miscellaneous
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R/C KITE/GLIDER DIGITAL CAMERA SYSTEM
CONTENTS AT A GLANCE Basic Components Construction of the Interface Installation Connecting the Systems R/C Digital Camera Control System Parts List
hotography is a powerful medium in capturing our lives, hobbies, and world around us. Aerial photography adds a whole dimension to seeing the world from a different perspective. Combining aerial photography and model building and remote control, the R/C digital camera control system combines the best of three hobbies in one project. The pictures you can capture with the R/C digital camera system are simply fascinating; see Fig. 18-1. In the past, film cameras produced only about 5 percent useful results because of motion blur, but with the digital camera system almost every picture is simply beautiful. The remote control digital camera system will work with a model R/C aeroglider or a nylon parafoil (lifting kite). The remote control digital camera system is built around the BASIC STAMP 2 microcomputer as the interface/controller between a model aircraft remote control system receiver and a digital camera. Once the controller is constructed, it s simply a matter of connecting cables between the receiver and the controller and the controller and a digital camera.
Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. 237
238 R/C KITE/GLIDER DIGITAL CAMERA SYSTEM
Figure 18-1 Kite camera view.
Many new digital cameras support a serial input/output jack that will easily interface with the STAMP 2 for serial control. The STAMP 2 accepts a single-channel output from a multichannel remote control receiver and uses the receiver pulses for sensing. The STAMP 2 in turn acts as an interface to the digital camera, snapping pictures as determined by you remotely. The R/C camera system can also be utilized to snap pictures on a timed interval if desired.
Basic Components
The R/C digital camera control system, as mentioned, revolves around the BASIC STAMP 2 microprocessor. It is shown in Fig. 18-2. The first eight I/O pins P0 through P7 are used for mode programing functions, via a bank of in-line DIP switches. The opposite side of the switch bank is tied to the 5-V supply. Each I/O input pin is also coupled to ground via 10-k pull-down resistors. The three program functions are shown in Table 18-1. The first mode is the single-shot R/C mode: toggling the transmitter control from off to on. The second mode is the time lapse R/C mode: the TX control is left on. Note that trigger intervals are made in variable steps between 10 seconds to an hour. The third mode is the standalone mode: the camera performs in the local time lapse mode, without intervention. The two LEDs on the controller circuit board are status indicators. The red error lamp is flashed if an acknowledgment (Ack) is not received from the camera following any command in the shutter-firing sequence, while the green lamp is to confirm that a shutter command has been successfully received by the camera. It is flashed after an (Ack)
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