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Circuit diagram of the Arduino Uno r3 laser relay. A) IDS dual camera laser triggering of IO MatchBox through the Arduino-registered camera flash signals. Common ground is used for all isolated GPIO optocouplers along with a high-always (Hi Always) digital output pin for each flash (+) wiring. B) AV camera GPIO and IO MatchBox wiring with the Arduino laser relay. The camera shares a non-isolated external ground with the Arduino.
