Step 1: Go Get Stuff
- Camera Flash (with input jack)
- MOC3021 optocoupler (Triac)
- 220 ohm to 1K resistor
- 3/32" mono plug
- Solid core wire
Step 2: Wire the Plug
Reassemble the casing.
Step 3: Wire It Up
Connect the other leg of the 1K resistor to pin 1 of the chip (this is the pin next to the dot).
Connect ground from the Arduino to pin 2 on the chip.
Connect the red wire from the 3/32" plug to pin 6 and the black wire to pin 4.
Step 4: Plug It In
Step 5: Program and Go
Assuming that your flash is turned on, it should now be triggered every 7 seconds.