Working with camera

[kko123]

How can I implement this logic:
I have external sensor conected to GPIO, i must see on display one frame from camera when sensor is active.
All new frames must raplace old frames. Frequency expected from the sensor is about 10 Hz.
Any idea?
Now i trying simply capture the frame and show it:

Code: Select all

import RPi.GPIO as GPIO
import time
import picamera
import picamera.array
from PIL import Image

pin=2 												# sensor pin
GPIO.setmode(GPIO.BCM)       
GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

with picamera.PiCamera() as camera:
    with picamera.array.PiRGBArray(camera) as stream:
        camera.resolution = (1280, 720)
        camera.iso = 800
        camera.awb_mode = 'auto'
        camera.framerate = 30
        time.sleep(2)

        while True:
            camera.capture(stream, 'rgb', use_video_port=True)
            stream.seek(0)
            img = Image.fromarray(stream.array, 'RGB')
            img.show()
            GPIO.wait_for_edge(pin, GPIO.RISING)

But images open in new window every time. How i can show it in the same window?
Can i use preview for my target?

[paddyg]

Using the standard features such as preview must be easier but I have captured picamera images as numpy arrays and displayed them using the gpu like this https://github.com/pi3d/pi3d_demos/blob ... imal_2d.py