用的是openMV-H7 R1
还有R1、R2、R3有什么区别呢？

# Edge Impulse - OpenMV Image Classification Example

import sensor, image, time, os, tf
import gc
gc.threshold(100000)
sensor.reset()                         # Reset and initialize the sensor.
sensor.set_pixformat(sensor.RGB565)    # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QQVGA)      # Set frame size to QVGA (320x240)
sensor.set_windowing((240, 240))       # Set 240x240 window.
sensor.skip_frames(time=2000)          # Let the camera adjust.

net = "trained.tflite"#模型文件
labels = [line.rstrip('\n') for line in open("labels.txt")]
#1 -
clock = time.clock()
while(True):
    clock.tick()
    gc.collect()
    img = sensor.snapshot()

    # default settings just do one detection... change them to search the image...
    for obj in tf.classify(net, img, min_scale=1.0, scale_mul=0.8, x_overlap=0.5, y_overlap=0.5):
        print("**********\nPredictions at [x=%d,y=%d,w=%d,h=%d]" % obj.rect())
        img.draw_rectangle(obj.rect())
        # This combines the labels and confidence values into a list of tuples
        predictions_list = list(zip(labels, obj.output()))

        for i in range(len(predictions_list)):
            print("%s = %f" % (predictions_list[i][0], predictions_list[i][1]))

    print(clock.fps(), "fps")

代码都是官网上的，没改过。

openmv代码

Blob Detection and uart transport

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

For color tracking to work really well you should ideally be in a very, very,

very, controlled enviroment where the lighting is constant...

yellow_threshold = (65, 100, -10, 6, 24, 51)

You may need to tweak the above settings for tracking green things...

Select an area in the Framebuffer to copy the color settings.

sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # use RGB565.
sensor.set_framesize(sensor.QQVGA) # use QQVGA for speed.
sensor.skip_frames(10) # Let new settings take affect.
sensor.set_auto_whitebal(False) # turn this off.
clock = time.clock() # Tracks FPS.

uart = UART(3, 19200)
def find_max(blobs):
max_size=0
for blob in blobs:
if blob.pixels() > max_size:
max_blob=blob
max_size = blob.pixels()
return max_blob

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

blobs = img.find_blobs([yellow_threshold])
if blobs:
    max_blob=find_max(blobs)
    print('sum :', len(blobs))
    img.draw_rectangle(max_blob.rect())
    img.draw_cross(max_blob.cx(), max_blob.cy())

    output_str="[%d,%d]" % (max_blob.cx(),max_blob.cy()) #方式1
    #output_str=json.dumps([max_blob.cx(),max_blob.cy()]) #方式2
    print('you send:',output_str)
    uart.write(output_str+'\r\n')
else:
    print('not found!')

Arduino代码
void setup() {
// put your setup code here, to run once:
Serial.begin(19200);
}

void loop() {
// put your main code here, to run repeatedly:
if (Serial.available()) {
// Read the most recent byte
byte byteRead = Serial.read();
// ECHO the value that was read
Serial.write(byteRead);
}
}

@kidswong999
https://shop67799229.taobao.com/?spm=a230r.7195193.1997079397.15.53f144e3nsTnhp
淘宝店的链接。
OpenMV4 H7 Cam
标配（主板+OV7725模组）

@ypk4 在 一直报UART(3)不存在怎么解决 中说：

我也是这个问题，openMV是咱家星瞳科技的。怎么回事呢？3也修改不了，一改就错。不该也错。同上述。