我想用OPEN MV串口3接收外界发送的一个信号，判断此信号是否为“PIC”，然后是就通过串口发送一个字符串“Finish1”,不是就发送“Unfinish1”,用串口调试助手调试时发送一个“PIC”，返回一个“Finish1”,但接着返回了很多“Unfinish1”.我猜测是代码中循环时应该在第一个else里把串口关闭一次或者是我的判定有问题。代码如下：

import sensor, image, pyb,time
from pyb import UART
RED_LED_PIN = 1
BLUE_LED_PIN = 3
uart = UART(3, 115200, timeout_char=1000)
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.VGA)
sensor.skip_frames(time = 500)
pyb.LED(RED_LED_PIN).off()
pyb.LED(BLUE_LED_PIN).on()
sensor.skip_frames(time = 500)
print("You're on camera!")
count = 0
while(True):
    if uart.any():
        a = uart.readline().decode()
        if a == "PIC":
            count = count + 1
            sensor.snapshot().save("%d.jpg"%(count))
            pyb.LED(1).on()
            pyb.LED(3).off()
            print("Done! Reset the camera to see the saved image.")
            uart.write("Finish2")
            print("Send Finish2.")
            time.sleep(100)
            pyb.LED(1).off()
            pyb.LED(3).on()
            a = "\n"
        else:
            uart.write("Unfinish2")
            print("Send Unfinish2.")
            a = "\n"
    else:
        sensor.snapshot()
        time.sleep(100)

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)

有大神帮忙解决一下么？万分感谢！

我想用arduino板子想OPENMV发送一字符让它拍照，且输入一次拍一张，如何实现？代码如下：

# 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

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(BLUE_LED_PIN).on()
sensor.skip_frames(time = 500) # Give the user time to get ready.

pyb.LED(BLUE_LED_PIN).off()

count = 0;

while(True):

    if uart.any():
        a = uart.readline().decode()
        if a == "OK\r\n":
            count = count + 1
            sensor.snapshot().save("%d.jpg"%(count)) # or "example.bmp" (or others)
            uart.write("Finish")
            pyb.LED(BLUE_LED_PIN).on()
            time.sleep(100)
            pyb.LED(BLUE_LED_PIN).off()
            a = "\n";

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

运行时，显示错误

我把32板子和openmv都连在电脑上，串口也连接了，按按键可以发送OK，复位后也可以拍照，但是用32来为openmv供电却无法拍照。

# 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.QVGA) # 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):
    if uart.any():
        a = uart.readline().decode()
        print(a)
        if a == "OK\r\n":
            img = sensor.snapshot()
            img.morph(1, [+2, +1, +0,\
                          +1, +1, -1,\
                          +0, -1, -2]) # Emboss the image.

            img.save("example.jpg") # or "example.bmp" (or others)

            pyb.LED(BLUE_LED_PIN).off()
            print("Done! Reset the camera to see the saved image.")

想问一下为什么用32为openmv提供5v电源无法拍照并储存到SD卡，以及如何实现不复位按一下按键就拍一张照。

行，我先看看，不懂再发，感谢你！

# 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
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(3, 9600, timeout_char=1000)

while(True):
    if uart.any():
        a = uart.readline().decode()
        print(a)
        if a == "OK\r\n":
            print("You're on camera!")
            img = sensor.snapshot()
            img.morph(1, [+2, +1, +0,\
                          +1, +1, -1,\
                          +0, -1, -2])
            img.save("example.jpg")
            print("Done! Reset the camera to see the saved image.")

我不知道怎么缩进，我是对照例程改的。

Traceback (most recent call last):
File "", line 21, in
RuntimeError: Sensor Timeout!!
MicroPython v1.9.4-4510-g23e8457de on 2018-06-29; OPENMV3 with STM32F765
Type "help()" for more information.

现在又不行了。

# 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(3, 19200, timeout_char=1000)

while(True):
    if uart.any():
        a = uart.readline().decode()
        print(a)
        if a == "OK\r\n":
            sensor.snapshot().save("example1.jpg")

Traceback (most recent call last):
File "", line 17, in
UnicodeError:
MicroPython v1.9.4-4510-g23e8457de on 2018-06-29; OPENMV3 with STM32F765
Type "help()" for more information.

@5ewo 在 python中应该如何判断接收到的字符串是发送的字符串？ 中说：

额，我缩进了4个空格，可能粘贴上去就没了，冒号是没加。但是还是不行，我记得例程中说还要复位一下，是不是必须这样。

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(3, 19200, timeout_char=1000)

while(True):
if uart.any():
a = uart.readline()
if a == "OK\r\n"
sensor.snapshot().save("example1.jpg")
我是要用32串口发送个字符串“OK\r\n”,在python中判断接收到的字符串，然后拍照储存到SD卡。

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(3, 19200, timeout_char=1000)

while(True):
if uart.any():
a = uart.readline()
if a == "OK\r\n"
sensor.snapshot().save("example1.jpg")
查了一下好像不能直接判断，应该如何判断接收的字符串呢？

恩，笨死了，调出来了！
if a = "OK\r\n"
sensor.snapshot().save("example1.jpg")
我又加了一句判断，但是显示语法错误。是不是不能这样判断呀。

@kidswong999
我按你说的将两个都连到电脑了，为了检验其是否接受到32发送的字符串写了代码如下：
import time
from pyb import UART

uart = UART(3, 9600, timeout_char=1000)

while(True):
if uart.any():
a = uart.readline().decode()
print(a)
目的显示其接收到的字符串。单独测试单片机没有问题发送“OK”，但是IDE上不显示。
接线：32使用USART2发送接收，TX2为PA2，RX2为PA3，OPENMV上串口RX为P0，TX为P1
所以PA2接P0，PA3接P1，还有一根线共地。接线如图：
想问一下，问题出在哪里？与上面UART里的3有关么？

好的，我试试，谢谢你！有问题再问你！

意思是，在OPENMV IDE中编程完下载运行后，再断电接到32上电后，程序依然在执行是么？

本人初学者，有C语言编程经验，想通过外接STM32单片机为OPENMV供电，通过串口发送指令控制OPENMV拍照并储存到SD卡中。因为外接单片机供电，所以不与电脑连接，也就用不到OPENMV IDE。
所以，我应该发送什么指令控制其拍照并储存到SD卡中呢？此时，python应该无法使用了吧，我要用C语言编程，是否需要找源码中对应的代码？希望得到一个解决方案。感谢各位大佬！