@kidswong999

# UART Control
#
# This example shows how to use the serial port on your OpenMV Cam. Attach pin
# P4 to the serial input of a serial LCD screen to see "Hello World!" printed
# on the serial LCD display.

import time
from pyb import UART

# Always pass UART 3 for the UART number for your OpenMV Cam.
# The second argument is the UART baud rate. For a more advanced UART control
# example see the BLE-Shield driver.
uart = UART(4, 115200)

while(True):
    l=([i for i in range(120)])

    for i in range(0,120,1):
        uart.write("!")
        out = '%d' % (l[i]/100)
        uart.write(out)
        out = '%d' % (l[i]/10%10)
        uart.write(out)
        out = '%d' % (l[i]%10)
        uart.write(out)

        #uart.write('d')
        #time.sleep(100)
    #uart.write("Hello World!\r")
    #uart.write('A')

    #time.sleep(1000)

嗯，谢谢您的回答，刚刚重开重下了程序就好了，但也不知道是不是这个原因