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242 R/C KITE/GLIDER DIGITAL CAMERA SYSTEM
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Figure 18-4 Glider with camera pointing downward.
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Figure 18-5 Glider with camera pointing sideways.
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obtain a connector to mate the free servo port channel output in order to make a cable from the receiver to the STAMP 2 interface. This camera control channel is then fed to P14, so the STAMP 2 can interpret the incoming receiver pulses. The other receiver channels are coupled directly to the respective servos for airframe control. The R/C digital camera project was tested with three different digital cameras, but other cameras will work. The prototype was tested with the Olympus models C400L, D340, and C840L cameras, all of which are based on the Fujitsu chip set. When wiring the cameras, be sure to take time to carefully determine the correct wiring to avoid damage to the cam-
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CONNECTING THE SYSTEMS 243
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era. Most digital cameras use the 3-wire serial system for remote control, i.e., serial TX, serial RX, and ground connections. Other digital cameras based on the Fujitsu chip set can be seen at http://photopc.sourceforge.net/.
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After constructing your camera controller interface, you are now ready to wire up the rest of the system. The diagram in Fig. 18-6 illustrates the interconnection between the controller and the receiver and controller and the digital camera. The receiver is connected to the BASIC STAMP 2 controller via header/plug J1/P1 on the controller board. The interface controller is wired to the digital camera via header/plug J2/P2. The diagrams in Figs. 18-7 and 18-8 depict two popular serial camera connections. Note that the cameras are powered from their own internal batteries and only serial signal leads connect the camera and controller via three wires, i.e., TX, RX, and ground. The R/C digital remote control camera system can be powered in two ways. The receiver battery pack is connected to the receiver module and a jumper set consisting of the plus lead and ground is wired from the receiver to the controller at pin 24, the Vcc lead. Powering the controller in this fashion utilizes the STAMP 2 s internal regulator to power just the controller. Alternatively, the STAMP 2 could be powered by applying regulated 5 V directly to pin 21. Once the digital R/C camera controller system is wired up and power is applied, it is now time to test out the system. First, you will need to locate the STAMP 2 editor program titled STAMPW.EXE; next, you will need to download the RCAMERA.BS2 (Listing 18-1) program into the STAMP 2 controller. Finally, you will need to make some final tests to make sure your system will be airworthy, before flying your camera glide/kite. Now is a good time to also test the mode DIP switches on the system controller for R/C control. It is recommended that the
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Pin 24 VCC
Ant RX battery pack
Header 1 P1 J1
R/C receiver Camera
Serial cable Figure 18-6 Interconnection diagram.
244 R/C KITE/GLIDER DIGITAL CAMERA SYSTEM
RS-233 out STAMP 2 P16 GND
RS-232 in STAMP 2 P15 View from camera
Figure 18-7 Serial camera 1.
RS-233 out STAMP 2 P16
RS-232 in STAMP 2 P15
Figure 18-8 Serial camera 2.
receiver/controller/camera be wired up completely before applying power. Next, turn on the R/C transmitter section and test to make sure all systems are working properly. Test the remote servos to ensure they are all functioning. Lastly, test the camera controller functions to ensure the camera shutter is working. Now that the whole system is working, you are ready to go fly a glider or kite!
R/C Digital Camera Control System Parts List
U1 U2 R1, R2, R3, R4 R5, R6, R7, R8 R9, R10 R11 C1 D1 BASIC STAMP 2 (original) LM7805 5-V regulator 10-k 10-k 33022-k
1 1 1 1 4-W 4-W 4-W 4-W
resistor resistor resistor resistor
4.7- F 50-V electrolytic capacitor LED (green)
R/C DIGITAL CAMERA CONTROL SYSTEM PARTS LIST 245
D2 PL S1, S2, S3, S4 S5, S6, S7, S8 S9 S10 Miscellaneous Battery R/C receiver servos R/C transmitter Camera
LED (red) DB-9/female RS-232 connector Mini DIP switches Mini DIP switches Momentary pushbutton SPST (normally open) SPST toggle switch (on-off) Headers, sockets, PC board, wire, jumpers, camera cable 6 9-V battery pack Futaba, JR, Hitec, Multiplex, etc. any receiver using regular R/C Futaba, JR, Hitec, Multiplex, etc. Olympus C400, D340, C840L cameras work great (Note: other cameras based on the Fujitsu chip set will work)
'RCAMERA.BS2 ' RADIO CONTROLLED DIGITAL CAMERA INTERFACE ' ' Copyright M. Shellim 1999-2002 ' Author M. Shellim ' Mods and fixes: Gary Thurmond ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' Monitors one channel of a Futaba receiver and controls Olympus C400L digital camera via serial i/o port configured for RS232 send/receive RC mode dip switch sets repeat in 10 sec interval. RC mode dip switch set to 00000(65535). Repeat interval will be as short as the camera cycle time. D-340R, std. = 3.0 sec, HQ = 5.1 sec. Changes not yet subjected to rigorous testing. Seems to work but haven't tried hard to break it (Ditto - MS). Note that there are debug statements and maybe some rem's. Hope I cleaned out other edits I made that do not address the RC interval subject. This is not a final version, just an example of speeding up the interval in the RC mode. The subroutines that I have hacked at are PUSH_SHUTTER, see comments there. AWAIT_WITH_TIMEOUT, see comments there.
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