串口发送色块中心点坐标的频率如何设置?
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import sensor, image, time from pyb import UART import json red_threshold = ((85, 43, 60, 96, -65, 38)) sensor.reset() # Initialize the camera sensor. sensor.set_pixformat(sensor.RGB565) # use RGB565. sensor.set_framesize(sensor.QVGA) # use QVGA for speed. sensor.skip_frames(10) # Let new settings take affect. sensor.set_auto_whitebal(False) # turn this off. clock = time.clock() # Tracks FPS. uart = UART(1, 9600) def find_max(blobs): max_pixels=0 for blob in blobs: if blob[4] > max_pixels: max_blob=blob max_pixels = blob[4] return max_blob while(True): clock.tick() img = sensor.snapshot() # Take a picture and return the image. blobs = img.find_blobs([red_threshold]) if blobs: max_blob=find_max(blobs) img.draw_rectangle(max_blob.rect()) img.draw_cross(max_blob.cx(), max_blob.cy()) pcx=max_blob.cx() pcy=max_blob.cy() cxy={"cx":pcx,"cy":pcy} uart.write(json.dumps(cxy) + '\r\n') print('you send:',cxy)
比如上面这样的代码,检测色块中心坐标并通过串口发出来,比如我现在想要500ms发一次,应该如何设置?我试过加延时函数500ms,但是发现摄像头的图像变得特别卡,好像不行
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https://docs.singtown.com/micropython/zh/latest/openmvcam/library/pyb.html
如果不想卡,那就在while循环里通过pyb.millis()写if判断是否到达500ms就行。