OX05B1S External Trigger

External Trigger Signal

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Pinout Definition

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Name	Pin
trigger input	FSIN
ground	GND

Windows GUI

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Arducam USB Camera Shield GUI

Access Camera Kit

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Tip

The new version of OX05B1S Evaluation Kit supports external trigger function. If you need related application, please contact sales@arducam.com  for the configuration file.

External Trigger Python code

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This tutorial is based on Raspberry Pi. You can use any embedded device that supports signal transmission in practice. Please correctly connect the camera and trigger signal parts according to the hardware connection section.

import RPi.GPIO as GPIO
import time
import argparse

GPIO.setwarnings(False)
GPIO.cleanup()
GPIO.setmode(GPIO.BCM)

GPIO.setup(18,GPIO.OUT)

def main(framerate):
    sleep_time = 1/framerate
    sleep_time = round(sleep_time, 3) - 0.001
    print("Start Trigger! Press CTRL+C to exit")
    try:
        while 1:
            GPIO.output(18, GPIO.HIGH)
            time.sleep(0.001)
            GPIO.output(18, GPIO.LOW)
            time.sleep(sleep_time)

    except KeyboardInterrupt:
        GPIO.cleanup()

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Trigger")
    parser.add_argument("-f", "--framerate", type=float, default=30, help="frame rate")
    args = parser.parse_args()

    main(args.framerate)

-f: frame rate of external trigger, in this example the trigger is 25 frames

python3 trigger.py -f 25

Demonstration

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Due to the default exposure time is relatively long, if you want to get a higher frame rate, you need to reduce the exposure time. For example, if you need to trigger externally to 25 frames, you need to adjust the exposure time to about 4000 us.

Note

If the frame rate does not reach the desired frame rate, you can try to reduce the exposure time.