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  • openmv和arduino数据传输的问题?求解决



    • 这个是arduino接受数据的

      int LED = 13;
      int i=0,p=0,m=0;
      void setup()
      {
        Serial.begin(115200);//模块上电灯快闪,arduino发送指令时需要按住模块上的按键
       pinMode(LED,OUTPUT);
      }
      void loop()
      {
          char ch;
          ch = Serial.read();
         Serial.print(ch);
      //   if(ch=='C')
      //   {
      //        digitalWrite(LED,HIGH);
      //         delay(100);
      //   }
        delay(40);
      //   digitalWrite(LED,LOW);
      }
      

      这个是openmv测距然后加了串口发送

      # Measure the distance
      #
      # This example shows off how to measure the distance through the size in imgage
      # This example in particular looks for yellow pingpong ball.
      
      import sensor, image, time
      
      from pyb import UART
      
      uart = UART(3, 115200)
      uart.init(115200, bits=8, parity=None, stop=1) # init with given parameters
      
      # 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   = ( 56,   83,    5,   57,   63,   80)
      # 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.
      
      K=5000#the value should be measured
      
      while(True):
          clock.tick() # Track elapsed milliseconds between snapshots().
          img = sensor.snapshot() # Take a picture and return the image.
      
          blobs = img.find_blobs([yellow_threshold])
          if len(blobs) == 1:
              # Draw a rect around the blob.
              b = blobs[0]
              img.draw_rectangle(b[0:4]) # rect
              img.draw_cross(b[5], b[6]) # cx, cy
              Lm = (b[2]+b[3])/2
              length = K/Lm
              output_str="[%d,%d]" % (b[5],b[6]) #方式1
              #output_str=json.dumps([max_blob.cx(),max_blob.cy()]) #方式2
              uart.write(output_str+'\r\n')
              print(b[5],b[6])
      
          #print(clock.fps()) # Note: Your OpenMV Cam runs about half as fast while
          # connected to your computer. The FPS should increase once disconnected.
      
      

      0_1564201250832_c3.png
      说明,问号是没有发送数据时的显示。问题:接受数据的前面的几个数据正常,为什么后面的就不对了?求解