用了lcd，还可以用串口通讯发送数据到mcu么。

@KIDSWONG999

Blob Detection and uart transport

import sensor, image, time,math
from pyb import UART
import json

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 = (75, 63, -55, 37, -55, -1)

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.

uart = UART(3, 115200)
uart.init(115200, bits=8, parity=None, stop=1) #8位数据位，无校验位，1位停止位、
def find_max(blobs):
max_size=0
for blob in blobs:
if blob.pixels() > max_size:
max_blob = blob
max_size = blob.pixels()
return max_blob

while(True):
img = sensor.snapshot() # Take a picture and return the image.

blobs = img.find_blobs([yellow_threshold])
if blobs:
    max_blob=find_max(blobs)
    print('sum :', len(blobs))
    img.draw_rectangle(max_blob.rect())
    img.draw_cross(max_blob.cx(), max_blob.cy())

    x1 = hex(max_blob.cx())
    y1 = hex(max_blob.cy())
    x2 = max_blob.cx()
    y2 = max_blob.cy()

    jiaoyan=0xaa+0x05+0xaf+0xf1+0x02+y2+x2
    #output_str=json.dumps([max_blob.cx(),max_blob.cy()]) #方式2![0_1563516584463_`$WYLQN}450~SUHYRXF@P8E.png](https://fcdn.singtown.com/976132a1-b197-41bd-b063-3b995573e719.png) 
    
    data = bytearray([0xaa,0x05,0xaf,0xf1,0x02,x2,y2,jiaoyan])
    uart.write(data)
    print('you send:',x1,y1,x2,y2)