为什么出现ValueError: invalid syntax for integer with base 10 错误

[2fmh]

## Hello World Example‘

#
# Welcome to the OpenMV IDE! Click on the green run arrow button below to run the script!

import sensor, image, time
import json
from pyb import UART
sensor.reset()                      # Reset and initialize the sensor.
sensor.set_pixformat(sensor.GRAYSCALE) # Set pi    1xel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QVGA)   # Set frame size to QVGA (320x240)
sensor.skip_frames(10)     # Wait for settings take effect.
clock = time.clock()                # Create a clock object to track the FPS.


uart = UART(3, 9600)
#sensor.set_auto_exposure()
string = "hello string!"

rect_tuple = (140, 100, 40, 40)
ROI = (140, 100, 40, 40)
threshold = (112, 0)
t = 0

while(True):
    clock.tick()                    # Update the FPS clock.
    image = sensor.snapshot()         # Take a picture and return the image.
    image.binary([threshold], invert = 1)
    statistics=image.get_statistics(roi=ROI)
    avg = json.dumps(statistics.mean())
    image.draw_circle(160,120,50)
    image.draw_cross(160, 120, size=5, color = (255, 0, 0))
    image.draw_rectangle(rect_tuple) #在图像中画一个矩形框

    #print(clock.fps())              # Note: OpenMV Cam runs about half as fast when connected

                                   # to the IDE. The FPS should increase once disconnected.
    if uart.any():
        t = int(uart.read())
    if t == 1:
         uart.write(avg + '\n')
         print('you send:',avg)

[kidswong999]

因为你串口收到的数据不是数字的字符串。