4. 串口输出COM3神秘消失
  • OpenMV VSCode 扩展发布了，在插件市场直接搜索OpenMV就可以安装
  • 如果有产品硬件故障问题，比如无法开机，论坛很难解决。可以直接找售后维修。
  • 发帖子之前，请确认看过所有的视频教程，https://singtown.com/learn/ 和所有的上手教程http://book.openmv.cc/
  • 每一个新的提问，单独发一个新帖子
  • 帖子需要目的，你要做什么？
  • 如果涉及代码，需要报错提示与全部代码文本，请注意不要贴代码图片
  • 必看：玩转星瞳论坛了解一下图片上传，代码格式等问题。

    • 串口输出COM3神秘消失

    • 1

      UART Control

      This example shows how to use the serial port on your OpenMV Cam. Attach pin

      P4 to the serial input of a serial LCD screen to see "Hello World!" printed

      on the serial LCD display.

      import time
      from pyb import UART

      Always pass UART 3 for the UART number for your OpenMV Cam.

      The second argument is the UART baud rate. For a more advanced UART control

      example see the BLE-Shield driver.

      uart = UART(3, 19200)
      import sensor, image, time, math

      threshold_index = 0 # 0 for red, 1 for green, 2 for blue

      Color Tracking Thresholds (L Min, L Max, A Min, A Max, B Min, B Max)

      The below thresholds track in general red/green/blue things. You may wish to tune them...

      thresholds = [(30, 100, 15, 127, 15, 127), # generic_red_thresholds
      (30, 100, -64, -8, -32, 32), # generic_green_thresholds
      (0, 30, 0, 64, -128, 0)] # generic_blue_thresholds

      sensor.reset()
      sensor.set_pixformat(sensor.RGB565)
      sensor.set_framesize(sensor.QVGA)
      sensor.skip_frames(time = 2000)
      sensor.set_auto_gain(False) # must be turned off for color tracking
      sensor.set_auto_whitebal(False) # must be turned off for color tracking
      clock = time.clock()

      Only blobs that with more pixels than "pixel_threshold" and more area than "area_threshold" are

      returned by "find_blobs" below. Change "pixels_threshold" and "area_threshold" if you change the

      camera resolution. "merge=True" merges all overlapping blobs in the image.

      while(True):
      clock.tick()
      img = sensor.snapshot()
      for blob in img.find_blobs([thresholds[threshold_index]], pixels_threshold=200, area_threshold=200, merge=True):
      # These values depend on the blob not being circular - otherwise they will be shaky.
      if blob.elongation() > 0.5:
      img.draw_edges(blob.min_corners(), color=(255,0,0))
      img.draw_line(blob.major_axis_line(), color=(0,255,0))
      img.draw_line(blob.minor_axis_line(), color=(0,0,255))
      # These values are stable all the time.
      img.draw_rectangle(blob.rect())
      img.draw_cross(blob.cx(), blob.cy())
      # Note - the blob rotation is unique to 0-180 only.
      img.draw_keypoints([(blob.cx(), blob.cy(), int(math.degrees(blob.rotation())))], size=20)
      uart.write("1")
      #print("none")

      原本是有COM3 和COM5，突然就剩下COM5了，代码把串口改为5，会报错ValueError:UART(5)doesn't exist
      串口助手显示如图
      0_1627472409661_QQ截图.png

      0

    • 代码里的UART3只和OpenMV的引脚有关，与电脑上的COM几无关。你换一个电脑，或者用其他串口模块，会发现COM几是变化的。

      解决办法，代码不要动，继续用UART 3， COM口的数字在设备管理器查看对应的。

      参考视频：https://singtown.com/learn/50240/

      0
      1
       1 条回复
    • 1

      @kidswong999 谢谢你，我OK了

      0