4. 向OPENMV供电时，代码储存在SD卡中为何灯无显示？
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    • 向OPENMV供电时，代码储存在SD卡中为何灯无显示？

    • 5

      下面两份代码，为何前者一供电，蓝灯就亮，而后者不行，我分别把代码都放入SD卡中测试了，难道不是一供电，OPENMV就运行SD卡中的代码么？还是别的问题？

      # 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 sensor, image, pyb
from pyb import UART

RED_LED_PIN = 1
BLUE_LED_PIN = 3

sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # or sensor.GRAYSCALE
sensor.set_framesize(sensor.VGA) # or sensor.QQVGA (or others)


pyb.LED(RED_LED_PIN).off()
#pyb.LED(BLUE_LED_PIN).on()
print("You're on camera!")

# 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(3, 9600, timeout_char=1000)

while(True):
    pyb.LED(3).on()
    if uart.any():
        a = uart.readline().decode()
        print(a)
        if a == "OK\r\n":
            sensor.snapshot().save("example1.jpg")
            uart.write("F")
            pyb.LED(BLUE_LED_PIN).off()
            print("Done! Reset the camera to see the saved image.")

      # 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 sensor, image, pyb,time
from pyb import UART

RED_LED_PIN = 1
BLUE_LED_PIN = 3

# 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(3, 9600, timeout_char=1000)

sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # or sensor.GRAYSCALE
sensor.set_framesize(sensor.VGA) # or sensor.QQVGA (or others)
sensor.skip_frames(time = 500) # Let new settings take affect.

pyb.LED(RED_LED_PIN).off()
sensor.skip_frames(time = 500) # Give the user time to get ready.

print("You're on camera!")

count = 0

while(True):
    pyb.LED(3).on()
    if uart.any():
        a = uart.readline().decode()
        if a == "OK":
            count = count + 1
            sensor.snapshot().save("%d.jpg"%(count)) # or "example.bmp" (or others)
            print("Done! Reset the camera to see the saved image.")
            uart.write("Finish")
            print("Send Finish.")
            time.sleep(100)
            pyb.LED(BLUE_LED_PIN).off()
            a = "\n";

    else:
        sensor.snapshot()
        time.sleep(100)
      0

    • https://singtown.com/learn/50244/

      按照步骤操作

      0