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  • 为什么我通过串口匿名发送的数据,有一个数据位一直为0



    • Blob Detection and uart transport

      import sensor, image, time,math
      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, 63, -55, 37, -55, -1)

      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)
      uart.init(115200, bits=8, parity=None, stop=1) #8位数据位,无校验位,1位停止位、
      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())
      
          x1 = hex(max_blob.cx())
          y1 = hex(max_blob.cy())
          x2 = max_blob.cx()
          y2 = max_blob.cy()
      
          jiaoyan=0xaa+0x05+0xaf+0xf1+0x02+y2+x2
          #output_str=json.dumps([max_blob.cx(),max_blob.cy()]) #方式2![0_1563516584463_`$WYLQN}450~SUHYRXF@P8E.png](https://fcdn.singtown.com/976132a1-b197-41bd-b063-3b995573e719.png) 
          
          data = bytearray([0xaa,0x05,0xaf,0xf1,0x02,x2,y2,jiaoyan])
          uart.write(data)
          print('you send:',x1,y1,x2,y2)


    • 0_1563517073818_`$WYLQN}450~SUHYRXF@P8E.png





    • 你应该print(data)来检查。