Check out udubinsky‘s instructable to learn how to shoot lightning by triggering exposures with spikes in ambient light.

Step 1: The need List

A DSLR camera

An Arduino board

2 X 220ohm resistor

A small PL conector (like the headphone only a bit smaller)

1 X 3-cord cable

1 Optoisolator

1 Potentiometer

A Led (optional)

1 Photocell

Find the full tutorial here.

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