4. NameError:name 'pyb'is not found.这是错误提示。怎样用I2C和arduino进行交流，
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    • NameError:name 'pyb'is not found.这是错误提示。怎样用I2C和arduino进行交流，

    • 1

      import sensor, image, time
      from pyb import I2C
      import ustruct
      sensor.reset()
      sensor.set_pixformat(sensor.RGB565) # grayscale is faster
      sensor.set_framesize(sensor.QVGA)
      sensor.skip_frames(time = 2000)
      clock = time.clock()
      black_threshold =(100,59,33,-100,-128,30)

      while(True):
      clock.tick()
      img = sensor.snapshot()

      img.draw_cross(160,120)
blobs = img.find_blobs([black_threshold])
if blobs:
    print('sum : %d'% len(blobs))
    out_str = '['
    for b in blobs:
        img.draw_rectangle(b[0:4]) # rect
        img.draw_cross(b[5], b[6]) # cx, cy
        x = b[5]
        y = b[6]
        img.get_pixel(x,y)
        out_str += '(%d,%d)' % (x,y)

    out_str += ']'
    print(out_str)


    if x<160:
       text = "right\n"
    elif x>160:
       text = "left\n"
    else:
       text = "stop\n"

    bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
    bus.deinit() # 完全关闭设备
    bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
    print("Waiting for Arduino...")

    while(True):
        try:
            bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
            try:
                bus.send(data, timeout=10000) # 然后发送数据
                print("Sent Data!") # 没有遇到错误时，会显示
            except OSError as err:
                pass
        except OSError as err:
            pass
    if y<120:
       text = "up\n"
    if y<120:
       text = "down\n"
    else:
       text = "stop\n"
    data = ustruct.pack("<%ds" % len(text), text)
    # OpenMV上的硬件I2C总线都是2
    bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
    bus.deinit() # 完全关闭设备
    bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
    print("Waiting for Arduino...")
    while(True):
        try:
            bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
            try:
                bus.send(data, timeout=10000) # 然后发送数据
                print("Sent Data!") # 没有遇到错误时，会显示
            except OSError as err:
                pass
        except OSError as err:
            pass

      while(True):
      clock.tick()
      img = sensor.snapshot()

      img.draw_cross(160,120)
blobs = img.find_blobs([GRAYSCALE_THRESHOLD])
if blobs:
    print('sum : %d'% len(blobs))
    out_str = '['
    for b in blobs:
        img.draw_rectangle(b[0:4]) # rect
        img.draw_cross(b[5], b[6]) # cx, cy
        x = b[5]
        y = b[6]
        img.get_pixel(x,y)
        out_str += '(%d,%d)' % (x,y)

    out_str += ']'
    print(out_str)
    if b[2]>b[3]:
       a=b[0]+b[1]
       if 160<a:
           text = "right\n"
       elif 160>a:
           text = "left\n"
       else:
           text = "stop\n"
    else:
       c=b[1]+b[3]
       if 120<c:
           text = "down\n"
       elif 120>c:
           text = "up\n"
       else:
           text = "stop\n"

    data = ustruct.pack("<%ds" % len(text), text)
    # OpenMV上的硬件I2C总线都是2
    bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
    bus.deinit() # 完全关闭设备
    bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
    print("Waiting for Arduino...")
    while(True):
        try:
            bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
            try:
                bus.send(data, timeout=10000) # 然后发送数据
                print("Sent Data!") # 没有遇到错误时，会显示
            except OSError as err:
                pass
        except OSError as err:
            pass

      0_1527492133548_621g
      请在这里粘贴代码

      0

    • 最前面加上

      import pyb
      0
    • 1

      加上了，是可以的 但是后面用I2C传送数据，由于程序的问题，出了错误，一直图像不更新，信息无法上传，程序运行的时候出现‘I2C’is not defind.并且运行程序后一直显示waiting for arduino...就走不下去了```
      请在这里粘贴代码

      Untitled - By: xuping - 周日 5月 27 2018

      import sensor, image, time
      import pyb
      from pyb import I2C
      import ustruct

      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.

      red_threshold =(0,100,8,127,-128,127)
      black_threshold =(100,59,33,-100,-128,30)

      data = i2c.recv(3) # 建立一个缓存区

      #data=1

      if data:

      while(True):
    clock.tick()
    img = sensor.snapshot()
    img.draw_cross(160,120)
    blobs = img.find_blobs([red_threshold], area_threshold=128)
    if blobs:
        print('sum : %d'% len(blobs))
        out_str = '['
        for b in blobs:
            img.draw_rectangle(b[0:4]) # rect
            img.draw_cross(b[5], b[6]) # cx, cy
            x = b[5]
            y = b[6]
            img.get_pixel(x,y)
            out_str += '(%d,%d)' % (x,y)

        out_str += ']'
        print(out_str)

        if x<160:
           text = "right\n"
        elif x>160:
           text = "left\n"
        else:
           text = "stop\n"
        data = ustruct.pack("<%ds" % len(text), text)
        # OpenMV上的硬件I2C总线都是2
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        bus.deinit() # 完全关闭设备
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        print("Waiting for Arduino...")
        while(True):
            try:
                bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
                try:
                    bus.send(data, timeout=10000) # 然后发送数据
                    print("Sent Data!") # 没有遇到错误时，会显示
                except OSError as err:
                    pass # 不用担心遇到错误，会跳过
                    # 请注意，有3个可能的错误。 超时错误（timeout error），
                    # 通用错误（general purpose error）或繁忙错误
                    #（busy error）。 “err.arg[0]”的错误代码分别
                    # 为116,5,16。
            except OSError as err:
                pass
        if y<120:
           text = "up\n"
        if y<120:
           text = "down\n"
        else:
           text = "stop\n"
        data = ustruct.pack("<%ds" % len(text), text)
        # OpenMV上的硬件I2C总线都是2
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        bus.deinit() # 完全关闭设备
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        print("Waiting for Arduino...")
        while(True):
            try:
                bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
                try:
                    bus.send(data, timeout=10000) # 然后发送数据
                    print("Sent Data!") # 没有遇到错误时，会显示
                except OSError as err:
                    pass
            except OSError as err:
                pass
print(out_str)

      else:
      while(True):
      clock.tick()
      img = sensor.snapshot()

          img.draw_cross(160,120)
    blobs = img.find_blobs(black_threshold)
    if blobs:
        print('sum : %d'% len(blobs))
        out_str = '['
        for b in blobs:
            img.draw_rectangle(b[0:4]) # rect
            img.draw_cross(b[5], b[6]) # cx, cy
            x = b[5]
            y = b[6]
            img.get_pixel(x,y)
            out_str += '(%d,%d)' % (x,y)

        out_str += ']'
        print(out_str)


        if x<160:
           text = "right\n"
        elif x>160:
           text = "left\n"
        else:
           text = "stop\n"

        data = ustruct.pack("<%ds" % len(text), text)
        # OpenMV上的硬件I2C总线都是2
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        bus.deinit() # 完全关闭设备
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        print("Waiting for Arduino...")
        while(True):
            try:
                bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
                try:
                    bus.send(data, timeout=10000) # 然后发送数据
                    print("Sent Data!") # 没有遇到错误时，会显示
                except OSError as err:
                    pass
            except OSError as err:
                pass
        if y<120:
           text = "up\n"
        if y>120:
            text = "down\n"
        else:
           text = "stop\n"
        data = ustruct.pack("<%ds" % len(text), text)
        # OpenMV上的硬件I2C总线都是2
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        bus.deinit() # 完全关闭设备
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        print("Waiting for Arduino...")
        while(True):
            try:
                bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
                try:
                    bus.send(data, timeout=10000) # 然后发送数据
                    print("Sent Data!") # 没有遇到错误时，会显示
                except OSError as err:
                    pass
            except OSError as err:
                 pass



while(True):
    clock.tick()
    img = sensor.snapshot()

    img.draw_cross(160,120)
    blobs = img.find_blobs([GRAYSCALE_THRESHOLD])
    if blobs:
        print('sum : %d'% len(blobs))
        out_str = '['
        for b in blobs:
            img.draw_rectangle(b[0:4]) # rect
            img.draw_cross(b[5], b[6]) # cx, cy
            x = b[5]
            y = b[6]
            img.get_pixel(x,y)
            out_str += '(%d,%d)' % (x,y)

        out_str += ']'
        print(out_str)
        if b[2]>b[3]:
           a=b[0]+b[1]
           if 160<a:
               text = "right\n"
           elif 160>a:
               text = "left\n"
           else:
               text = "stop\n"
        else:
           c=b[1]+b[3]
           if 120<c:
               text = "down\n"
           elif 120>c:
               text = "up\n"
           else:
               text = "stop\n"

        data = ustruct.pack("<%ds" % len(text), text)
        # OpenMV上的硬件I2C总线都是2
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        bus.deinit() # 完全关闭设备
        bus = pyb.I2C(2, pyb.I2C.SLAVE, addr=0x12)
        print("Waiting for Arduino...")
        while(True):
            try:
                bus.send(ustruct.pack("<h", len(data)), timeout=10000) # 首先发送长度 (16-bits).
                try:
                    bus.send(data, timeout=10000) # 然后发送数据
                    print("Sent Data!") # 没有遇到错误时，会显示
                except OSError as err:
                    pass
            except OSError as err:
                pass

      0_1527510945752_$JHDQWK0YU14B98$X`ZQ_HT.jpg

      0
    • 1

      0_15275110980png 就是这个图片

      0

    • 我不知道你的代码是哪来的。

      http://book.openmv.cc/example/02-Board-Control/arduino-i2c-slave.html

      0
    串口通信 97