Create trigger.py

Jetson/Jetvariety/external_trigger/trigger.py

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+# Arducam External trigger signal generator.
+# Copyright (C) 2022, Arducam.
+
+# External module imports
+import RPi.GPIO as GPIO
+import time
+
+# Pin Definitons:
+ledPin = 2 # Broadcom pin 2
+# Pin Setup:
+GPIO.setmode(GPIO.BCM) # Broadcom pin-numbering scheme
+GPIO.setup(ledPin, GPIO.OUT) # LED pin set as output
+
+# Initial state for LEDs:
+GPIO.output(ledPin, GPIO.LOW)
+
+print("Start Trigger! Press CTRL+C to exit")
+try:
+    while 1:
+        GPIO.output(ledPin, GPIO.HIGH)
+        time.sleep(0.001)
+        GPIO.output(ledPin, GPIO.LOW)
+        time.sleep(0.032)
+except KeyboardInterrupt: # If CTRL+C is pressed, exit cleanly:
+    GPIO.cleanup() # cleanup all GPIO