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  • 请问一下代码 uart.write(output_str),发送出去的数据是什么类型的?



    • Blob Detection and uart transport

      import sensor, image, time
      from pyb import UART
      import json

      For color tracking to work really well you should ideally be in a very, very,

      very, controlled enviroment where the lighting is constant...

      yellow_threshold = (75, 26, 24, -29, -67, -31)

      You may need to tweak the above settings for tracking green things...

      Select an area in the Framebuffer to copy the color settings.

      sensor.reset() # Initialize the camera sensor.
      sensor.set_pixformat(sensor.RGB565) # use RGB565.
      sensor.set_framesize(sensor.QQVGA) # use QQVGA 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(3, 115200)
      def find_max(blobs):
      max_size=0
      for blob in blobs:
      if blob.pixels() > max_size:
      max_blob=blob
      max_size = blob.pixels()
      return max_blob

      while(True):
      img = sensor.snapshot() # Take a picture and return the image.

      blobs = img.find_blobs([yellow_threshold])
      if blobs:
          max_blob=find_max(blobs)
          print('sum :', len(blobs))
          img.draw_rectangle(max_blob.rect())
          img.draw_cross(max_blob.cx(), max_blob.cy())
      
          output_str="[%d]" % (max_blob.cx()-img.width()/2) #方式1
          #output_str=json.dumps([max_blob.cx(),max_blob.cy()]) #方式2
          print('you send:',output_str)
          uart.write(output_str)
      else:
          print('not found!')


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