4. openmv 和arduino无法通信
  • OpenMV VSCode 扩展发布了，在插件市场直接搜索OpenMV就可以安装
  • 如果有产品硬件故障问题，比如无法开机，论坛很难解决。可以直接找售后维修。
  • 发帖子之前，请确认看过所有的视频教程，https://singtown.com/learn/ 和所有的上手教程http://book.openmv.cc/
  • 每一个新的提问，单独发一个新帖子
  • 帖子需要目的，你要做什么？
  • 如果涉及代码，需要报错提示与全部代码文本，请注意不要贴代码图片
  • 必看：玩转星瞳论坛了解一下图片上传，代码格式等问题。

    • openmv 和arduino无法通信

    • 2
       

      # Measure the distance
#
# This example shows off how to measure the distance through the size in imgage
# This example in particular looks for blue pingpong ball.

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

# For color tracking to work really well you should ideally be in a very, very,
# very, controlled enviroment where the lighting is constant...
blue_threshold   = ((69, 88, -35, -15, -53, 0))
# 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(1,9600)
K=500#the value should be measured

def find_max(blobs):
    max_pixels=0
    for blob in blobs:
        if blob[4] > max_pixels:
            max_blob = blob
            max_pixels = blob[4]
    return max_blob

while(True):
    clock.tick()
    img = sensor.snapshot()

    blobs =img.find_blobs([blue_threshold])
    if blobs:
        max_blob = find_max(blobs)
        img.draw_rectangle(max_blob.rect())
        img.draw_cross(max_blob.cx(),max_blob.cy())
        pcx = max_blob.cx()
        pcy = max_blob.cy()
        cxy = {"cx":pcx,"cy":pcy}
        uart.write(ujson.dumps(cxy)+'\r\n')
        print(cxy)

      #include <ArduinoJson.h>

      volatile int cx;
      volatile int cy;
      volatile char c;
      String json;

      void setup(){
      cx = 0;
      cy = 0;
      c = 0;
      json = "";
      Serial.begin(9600);
      }

      void loop(){
      if (Serial.available() > 0) {
      c = char(Serial.read());
      json = String(json) + String(c);
      if (c == '}') {
      StaticJsonBuffer<200> jsonBuffer;
      JsonObject& root = jsonBuffer.parseObject(json);
      if (!root.success()) {
      Serial.println("JSON failed!");
      }
      int cx = root["cx"];
      int cy = root["cy"];
      Serial.print("cx = ");
      Serial.print(cx);
      Serial.print('\t');
      Serial.print("cy = ");
      Serial.println(cy);
      json = "";
      }
      }
      }
      0

    • https://book.openmv.cc/MCU/serial2.html

      0