没有USB串口调试扩展板怎么办？

请在这里粘贴代码
```import sensor, image, time
from image import SEARCH_EX, SEARCH_DS
from pyb import UART
import json


thresholds = [(10,   100,  -19,   12,   -21,   16),
              (32,   55,  30,   64,   8,   38),
              (17,   100,  -34,   24,   -6,   40)]


sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False)
sensor.set_auto_whitebal(False)
clock = time.clock()

uart = UART(3, 115200)
uart.init(115200, bits=8, parity=None, stop=1)

#def send_data_packet(x, y):
#    temp = struct.pack("<bbii",                #格式为俩个字符俩个整型
#                   0xAA,                       #帧头1
#                   0xAE,                       #帧头2
#                   int(x), # up sample by 4    #数据1
#                   int(y)) # up sample by 4    #数据2
#    uart.write(temp)


templates = ["/13.pgm", "/14.pgm", "/15.pgm"] #保存多个模板

while(True):
    clock.tick()
    img = sensor.snapshot()
    for blob in img.find_blobs(thresholds, pixels_threshold=100, area_threshold=100):
        #output_str = json.dumps(blob)
        #img.draw_rectangle(blob,color=(255,0,0))
        #img.draw_cross(blob.cx(), blob.cy())
        #print(blob.code())
        x=blob.cx()
        y=blob.cy()

        img = img.to_grayscale()
        for t in templates:
            template = image.Image(t)
            #对每个模板遍历进行模板匹配
            r = img.find_template(template, 0.70, step=4, search=SEARCH_EX) #, roi=(10, 0, 60, 60))
            if r:
            
                FH = bytearray([0xb3,0xb3])
                uart.write(FH)
                
                img.draw_rectangle(r, color=255)
                

                print(blob.code(), t)
                output_str="[%d,%d]" % (blob.cx(), blob.cy())
                data = bytearray([x,y])

                uart.write(data)
                print(output_str)
            else:
                print('not found!')





    #print(clock.fps())

怎么解决这个问题

我根据找寻色块可以识别出焊点，但是标记短路的话，我该用什么方法

我先用特征点检测做识别元件，怎么才能一起检测不同的元件

from pyb import UART
import json
white_threshold   = (   40,   99,  -6,   17,   -11,   16)
red_threshold	 = (   32,   55,  30,   64,   8,   38)
self_threshold	= (   60,   78,  20,   47,   10,   45)
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(10)
sensor.set_auto_whitebal(False)
clock = time.clock()
uart = UART(3, 115200)
def find_max(blobs):
	max_size=10
	for blob in blobs:
		if blob.pixels() > max_size:
			max_blob=blob
			max_size = blob.pixels()
	return max_blob
while(True):
	img = sensor.snapshot()
	blobs = img.find_blobs([white_threshold])
	output_str = json.dumps(blobs)
	if blobs:
		for b in blobs:
			img.draw_rectangle(b[0:4])
			img.draw_cross(b[5], b[6])
			max_blob=find_max(blobs)