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the Ultimate Analog Intervalometer

The Ultimate Analog Intervalometer is a programmable multipurpose camera controller.

Features

Current

• Built-in switch and external sensor trigger
• Controls camera shutter release and focus lock with EOSRebelRemote interface
• Bulb mode - shutter is directly opened as long as trigger signal is active
• Single timed mode - trigger rising edge starts timed shutter pulse
• Burst timed mode - train of timed shutter pulses as long as trigger signal is active

Planned

• Self timer - delay between trigger rising edge and timed shutter pulse
• Plugins - add-on modules can read and modify trigger, focus, and shutter signals and draw power from the intervalometer

Parts List

• 2 5V reed relay
• 1 MC33269 LDO voltage regulator
• 2 555 Timers (or one 556)
• 1 DC power jack
• 1 2-position terminal block
• ~8 Resistors
• ~5 Capacitors
• 2 Potentiometer
• 3 NPN small-signal transistor (e.g. 2N2222)
• 1 PNP small-signal transistor (e.g. 2N2907)
• 3 LEDs
• 2 momentary SPST switch (pushbutton)
• 1 latching SPST switch (toggle or rocker)
• 2 SPDT switch (toggle or rocker)

Schematic

Schematic for revision 1: %IMAGE{"intervalometer.png" type="frame" align="center" size="600"}%

Applications

Time-lapse

Time-lapse video of cloud movement made using this intervalometer:

-- StephenCavilia - 2009-08-05

• intervalometer.sch: rev1 schematic