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Digital camera Figure 18-2 R/C camera system schematic.
240 R/C KITE/GLIDER DIGITAL CAMERA SYSTEM
TABLE 18-1 I/O PIN FUNCTION
0 through 5 6 7
TimeoutVal 0 127; pin 0 is LS bit; all switches OFF 63 Multiplier for TimeoutVal (pins 0 5); on: timeout off: timeout TimeoutVal 10 seconds Mode; off R/C; on stand-alone
0; all switches ON
TimeoutVal minutes;
is received after the last command in the shutter-firing sequence (except in continuous mode). The STAMP 2 controller is shown powered by the remote control receiver, using a 6V battery pack. The battery system also powers the interface and other servos used for aileron and elevator functions. Programming the STAMP 2 controller is facilitated by using pins 1 through 4. These four pins are brought out to a 4-pin single-row female header, mounted on the circuit or perfboard. You will need to make a programming cable, with a male header at one end and a DB-9 female connector at the other end for initial programming.
Construction of the Interface
Construction of the R/C digital photography interface is quite simple, and it can be built on a small perfboard or circuit board. RadioShack has a number of suitable inexpensive perfboards that could be used for the controller/interface circuit, or you could elect to construct your own circuit board if desired; see Fig. 18-3. The layout of the circuit is quite simple. The prototype was constructed using an integrated circuit socket for the STAMP 2. When installing components on the circuit board, be sure to observe the correct polarity for the capacitors and LEDs. When installing the BASIC STAMP 2, be careful to orient the controller correctly when installing it to the IC socket. On the low pin number side of the STAMP 2, two 4-position DIP switch assemblies are mounted close to the STAMP 2. Each I/O input, P0 through P7, also requires a resistor on each input pin. You can choose either single resistors or an SIP multiresistor package to do the job. The multiresistor SIP packs are easy to work with but a bit more difficult to locate than conventional resistors. On the high I/O pin number side of the STAMP 2, i.e., pins 8 through 15, you will need to install the status indicator LEDs and the RS-232 input/outputs, as well as the reset pushbutton. The reset switch, a normally open pushbutton switch, is used in the event of a system lockup. A 4-pin single-row female header makes an ideal serial interface connector for the RS-232 input/output to the digital camera on pins P10 and P11. Remember to also include a ground connection for the serial I/O connection that is available from STAMP 2 pin 23. A second single-row female header should also be installed for the receiver input on pin P14. Remember to connect a ground connection to the header. Next you will have to make up a
INSTALLATION 241
Figure 18-3 R/C camera system PC board.
camera cable between the camera and the RS-232 header and an R/C receiver-to-header cable between the receiver and the RX input header. The smaller and lighter the circuit board the better, to lessen the total system weight.
Installation
The prototype of the R/C digital camera project was installed underneath the sailplane or glider. Initial flight tests used a cardboard box instead of a real camera. The test box should be weighted with the approximate weight of the camera/interface assembly to establish a center of gravity and to see the effect on the aerodynamics or handling characteristics. The box was taped under the sailplane, and was tested with different box positions. Two configurations seemed to work best. First, the test box was used with the simulated camera pointing downward. In this test, it was determined that there was a reduction in glide but handling was safe; see Fig. 18-4. In the next best configuration, the simulated camera was pointed sideways. This produced good handling and good glide performance; see Fig. 18-5. A Futaba five-channel R/C control system is used for this project; other systems such as Hitec or Multiplex could be used. The prototype R/C system is used to control ailerons, elevator, spoiler, rudder, and the camera interface. You could also get by with a four-channel system, with a bit less control. Simply refer to the receiver documentation to determine the pinouts of the receiver. Once a free servo port channel is determined, you will need to
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