What is the trigger input GPIO?
The trigger input GPIO circuit allows the camera to receive an alarm trigger input. When the trigger occurs, the camera starts recording video and sends a notification to the pre-defined user. The trigger input port requires a current of 10-30 mA to trigger an alarm. The circuit is designed with a 220 Ohm resistor in series allowing a typical input voltage of 5 V, as shown in the figure below. For higher voltage triggers an external resistor or other limiting device should be used to limit the current through the trigger input. Note: TRIG_A and TRIG_K on the diagram above corresponds to the Trigger In + and Trigger In – respectively on the camera’s interface connector.
