为什么用串口助手接受不到呢？

isdz

# Untitled - By: HP - 周五 6月 7 2019

import sensor,time,pyb,math,image
import json
from pyb import Pin,Timer,LED,UART


uart_buf =bytearray([0x55,0x00,0x00,0x00,0x00,0xAA])
#设置发送串口3
uart = UART(3,9600)
uart.init(9600,bits=8,parity=None,stop=1)

x_error =0
y_error =0
x_Sign = 0
y_Sign = 0
error_flag=0
car_lost=1
lenth=3

def find_max(blobs):    #寻找最大色块函数定义
    max_pixels=0         #通过像素比较
    for blob in blobs:     #blob[0,1，2，3，4]=x,y,w,h,pixels (int)
         if blob[4]>max_pixels:
             max_blob=blob
             max_pixels=blob[4]
    return max_blob

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA) # we run out of memory if the resolution is much bigger...  图像像素大小QQVGA是160✖120
sensor.skip_frames(30)
sensor.set_auto_gain(False)  # must turn this off to prevent image washout...
sensor.set_auto_whitebal(False)  # must turn this off to prevent image washout...
sensor.set_auto_exposure(True)
clock = time.clock()

black = (25, 95, 77, 22, -16, 63)

while(True):
   clock.tick()
   img=sensor.snapshot()
   blobs = img.find_blobs([black])
   if blobs:
      max_blob=find_max(blobs)
      img.draw_rectangle(max_blob.rect())
      img.draw_cross(max_blob.cx(),max_blob.cy())
      x_error = int(max_blob.cx()-img.width()/2)
      y_error = int(max_blob.cy()-img.height()/2)
      if x_error==0:
         x_Sign = 0
      if x_error >0:
         x_Sign = 1
      if x_error <0:
         x_Sign = 2
      if y_error == 0:
         y_Sign = 0
      if y_error >0:
         y_Sign = 1
      if y_error < 0:
         y_Sign = 2
      error_flag=0
      print_data=(error_flag,x_error,y_error)
      print('error_flag: %d x_error: %d y_error: %d' % print_data)
      #x_abs=abs(x_error)
      #y_abs=abs(y_error)
      uart_buf_1 = bytearray([0x55, lenth, error_flag, x_error, y_error, 0xAA])
      uart.write(uart_buf_1)
   else:
      error_flag |= car_lost
      x_error = 0
      y_error = 0
      print_data=(error_flag,x_error,y_error)
      print('error_flag: %d x_error: %d y_error: %d' % print_data)
      uart_buf_2 = bytearray([0x55, lenth, error_flag, x_error, y_error, 0xAA])
      uart.write(uart_buf_2)

kidswong999

https://singtown.com/learn/50235/

先按照视频操作。

为什么用串口助手接受 不到呢？

为什么用串口助手接受不到呢？