4. 关于openmv和arduino串口通信
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    • 关于openmv和arduino串口通信

    • H
       

      char str;
void setup(){
  Serial.begin(9600);
}
 
void loop(){
    if(Serial.available()>0)
    {
      str=Serial.read();
      Serial.println(str);
    }
    delay(1000);
}

      import time, pyb
from machine import UART
led = pyb.LED(3)
#from pyb import UART
uart = UART(3, 9600)   

while(True):
    uart.write("1")
    time.sleep_ms(5000)
    led.on()

      openmv显示灯亮了应该发送成功了 可是arduino串口没接收到是怎么回事 老师

      0
    • H

      就是arduino的串口监视器一直输出-1不知道咋回事，也用了Serial.readString（）也没用

      0

    • 注意一下接线：

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

      我推荐Arduino上用softSerial(10, 11)来和OpenMV通信，因为Seria被串口监视器占用了。

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      H
       2 条回复
    • H

      @kidswong999 我就是引用官方的例程.寻找黄色色块，openmv发现以后arduino的串口还是一个数据都没有

      #include <SoftwareSerial.h>

SoftwareSerial softSerial(10, 11); // RX, TX
typedef struct
{
  int data[50][2] = {{0,0}};
  int len = 0;
}List;
List list;

void setup() {
  // put your setup code here, to run once:
  softSerial.begin(115200);
  Serial.begin(115200);
}

void loop() {
  if(softSerial.available())
  {
    getList();
    for (int i=0; i<list.len; i++)
    {
      Serial.print(list.data[i][0]);
      Serial.print('\t');
      Serial.println(list.data[i][1]);
    }
    Serial.println("============");
    clearList();
  }

}


String detectString()
{
  while(softSerial.read() != '{');
  return(softSerial.readStringUntil('}'));
}
void clearList()
{
  memset(list.data, sizeof(list.data),0);
  list.len = 0;
}
void getList()
{
  String s = detectString();
  String numStr = "";
  for(int i = 0; i<s.length(); i++)
  {
    if(s[i]=='('){
      numStr = "";
    }
    else if(s[i] == ','){
      list.data[list.len][0] = numStr.toInt();
      numStr = "";
    }
    else if(s[i]==')'){
      list.data[list.len][1] = numStr.toInt();
      numStr = "";
      list.len++;
    }
    else{
      numStr += s[i];
    }
  }
}


      import sensor, image, time
import json
from machine import UART
yellow_threshold   = ( 46,  100,  -68,   72,   58,   92)
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, 115200)  
while(True):
    clock.tick() # Track elapsed milliseconds between snapshots().
    img = sensor.snapshot() # Take a picture and return the image.
    blobs = img.find_blobs([yellow_threshold])
    if blobs:
        #print('sum : %d'% len(blobs))
        data=[]
        for b in blobs:
            # Draw a rect around the blob.
            img.draw_rectangle(b.rect()) # rect
            img.draw_cross(b.cx(), b.cy()) # cx, cy
            data.append((b.cx(),b.cy()))

        #{(1,22),(-3,33),(22222,0),(9999,12),(0,0)}
        data_out = json.dumps(set(data))
        uart.write(data_out +'\n')
        print('you send:',data_out)
    else:
        print("not found!")
      0
    • H

      @kidswong999

      #include <SoftwareSerial.h>
SoftwareSerial softSerial(10, 11); // RX, TX
void setup() 
{
  softSerial.begin(9600);
  Serial.begin(9600);
}
void Openmv(String s)
{
    if(s[1]=='0')
     {
     Serial.print('0');
     Serial.print('\n');
     }
    if(s[1]=='1')
     {    
     Serial.print('1');
     Serial.print('\n');
     }
    if(s[1]=='2')
     {     
     Serial.print('2');
     Serial.print('\n');
     }
}
void loop() 
{
  if(softSerial.available())
 {
    String s = detectString();
     Openmv(s);
  }
}
String detectString()
{
  while(softSerial.read() != '{');
  return(softSerial.readStringUntil('}'));
}

      这个是arduino的

      import sensor, image, time
import json
from pyb import UART
blue_threshold   = (22, 67, 9, 127, -128, -54)
red_threshold   = (41, 61, 42, 127, -128, 127)
yellow_threshold   = ( 60 ,10,-15,20,30,80)
sensor.set_hmirror(True)
sensor.set_vflip(True)
sensor.reset() 
sensor.set_pixformat(sensor.RGB565) 
sensor.set_framesize(sensor.QQVGA) 
sensor.skip_frames(10) 
sensor.set_auto_whitebal(False) 
clock = time.clock()
uart = UART(3, 9600)
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):
    clock.tick() 
    img = sensor.snapshot() 
    blobs0 = img.find_blobs([blue_threshold])
    blobs1 = img.find_blobs([red_threshold])
    blobs2 = img.find_blobs([yellow_threshold])
    if blobs0:
     max_blob=find_max(blobs0)
     img.draw_rectangle(max_blob.rect())
     img.draw_cross(max_blob.cx(), max_blob.cy())
     data="0"
     data_out = json.dumps(set(data))
     uart.write(data_out +'\n')
     print('you send:',data_out)
    elif blobs1:
     max_blob=find_max(blobs1)
     img.draw_rectangle(max_blob.rect())
     img.draw_cross(max_blob.cx(), max_blob.cy())
     data="1"
     data_out = json.dumps(set(data))
     uart.write(data_out +'\n')
     print('you send:',data_out)
    elif blobs2:
     max_blob=find_max(blobs2)
     img.draw_rectangle(max_blob.rect())
     img.draw_cross(max_blob.cx(), max_blob.cy())
     data="2"
     data_out = json.dumps(set(data))
     uart.write(data_out +'\n')
     print('you send:',data_out)
    else:
        print('not found')

      这个是openmv的

      这两个程序更直观点，但是就是没有数据，用程序看openmv应该是发送成功了，但是arduino接收不到，串口监视器一个数据没有

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    • OpenMV画面里有找到黄色色块吗？没找到不会发送。还有注意接线，一定要接GND。

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      H
       1 条回复
    • H

      @kidswong999 两个板子是共地的，摄像头也检测到了

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