# Can openmv usart send image by uart.write()？

**URL:** <https://forums.openmv.io/t/can-openmv-usart-send-image-by-uart-write/8664>\
**Category:** OpenMV Boards\
**Created:** [August 22, 2023, 2:53am UTC](https://forums.openmv.io/t/can-openmv-usart-send-image-by-uart-write/8664 "2023-08-22T02:53:26Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![sjh2100](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/sjh2100/32/2979_2.png) [@sjh2100](https://forums.openmv.io/u/sjh2100)\
**Post date:** [August 22, 2023, 2:53am UTC](https://forums.openmv.io/t/can-openmv-usart-send-image-by-uart-write/8664/1 "2023-08-22T02:53:26Z")

</div>

i find a webpage[OpenMV串口发送图片](https://blog.csdn.net/weixin_35802571/article/details/112820723)  
in that page ,it has some code for send image by uart.write()

```auto
OpenMV串口发送图片
# Hello World Example

#

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

import sensor, image, time

 from pyb import 
UART

uart = UART(3)

uart.init(115200, timeout_char=1000)

sensor.reset() 
# Reset and initialize the sensor.

sensor.set_pixformat(sensor.RGB565) 
# Set pixel format to RGB565 (or GRAYSCALE)

sensor.set_framesize(sensor.QVGA) 
# Set frame size to QVGA (320x240)

sensor.skip_frames(time = 2000) 
# Wait for settings take effect.

clock = time.clock() 
# Create a clock object to track the FPS.

while(True):

clock.tick() 
# Update the FPS clock.

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

uart.write(img.compressed(quality=50)) 
# Note: OpenMV Cam runs about half as fast when connected

# to the IDE. The FPS should increase once disconnected.

```

i have no idea if it will work ,i check the [help](https://docs.micropython.org/en/v1.9.3/pyboard/library/pyb.UART.html):  
_`UART.` `write` (buf )_

_Write the buffer of bytes to the bus. If characters are 7 or 8 bits wide then each byte is one character. If characters are 9 bits wide then two bytes are used for each character (little endian), and `buf` must contain an even number of bytes._

Return value: number of bytes written. If a timeout occurs and no bytes were written returns `None`.  
/----------------------------------------------/  
can usart send image by uart.write()?