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The IronCam Series of Shutter Triggers WARNING: These circuits have only been tested on the breadboard using LEDs to simulate camera operations. Ironsides assumes no responsibility for any damage done by persons using these circuits. Ironsides has no professional background in electronics, nor has he any training in electronics. This series of electronic camera shutter triggers was developed to provide a mix of single shot, video continuous shooting, stay-alive by triggering a shot, stay-alive by pulsing the On/Off button and a choice of left stick (rudder) or gear Up/Down switching. The 12F675 PIC was used because it is a small 8 pin DIP package that fits into small spaces. The download includes the PicBasicPro PBP file and the HEX code. The schematic for the hardware is shown below. A sample listing is shown on the sidebar as IronCam-2
NOTES: Simply eliminate the circuitry coming off Pin 2 if you are not trying to pulse the Mustek On/Off switch. The Mustek camera battery provides a nominal 3.7 volts. The camera seems to operate in the 3 volt range. Therefore, the values of R1 and R2 have to be determined so that the 4.8 volts from Pin2 are cut back to about 3 volts for the Mustek. The formula is: Voltage Desired/Voltage Supplied = R2/(R1+R2). Thus, if R1= 100 ohms and R2 = 220 ohms, the 4.8 volts coming off Pin 2 will be cut back by the voltage divider of R1 and R2 to about 3.3 volts. Make sure you place the 0.1 microfarad capacitor as close as possible to Pins 1 and 8 of the PIC. This capacitor traps spurious signals that can make the PIC run erratically. The hi-intensity LED is rated at 3.5 volts for 20 mA. Since the PIC outputs 25mA, a 220 ohm resistor should be about right. Mr. RC-CAM reports that standard LEDs are under 50 MCD (millicandles). The light output is stated as 5800 MCD - it is VERY bright. It is intended to provide visual confirmation that the shutter has tripped or that video is ON. The 2N7000 MOSFET is used to buffer the output signal. The drain and the source are wired in parallel across the camera shutter switch. By using the 2N7000, we guard against pumping too much juice into the camera. (Credit to Michele Schieppati and Mr. RC-CAM) If you wish to isolate the camera's ground, then use opto-isolators on all camera connections. [Credit Mr. RC-CAM]
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