Question

我在做Python和Arduino串口通讯。这是我的代码的一部分。

while True:
    data = arduino.readline()
    str = data[:-2].decode()
    print(str) # to check the str

    if str: # if str gets 1 from arduino
        some logics here..............

但问题是当python代码运行while子句时，Arduino仍在向Python发送数据。我认为如果它继续发送到python，我不认为代码进展顺利。那么问题是如何在while子句启动时停止发送数据？提前谢谢。

整个代码就在这里！

python代码

import serial
import time
import MySQLdb
from datetime import datetime
import cv2
import boto3
now = datetime.today().strftime("%Y-%m-%d-%H-%M-%S")
station="hansung-"
type=".jpg"
filename=station+now+type

st=filename.split('-')[0]
ye=filename.split('-')[1]
mo=filename.split('-')[2]
da=filename.split('-')[3]



#the picture is just uploaded in to s3 bucket


port ="COM15" #I am testing this on my windows laptop
brate = 9600
arduino =serial.Serial(port, baudrate = brate, timeout=None)


while True:
    #keep receive data from arduino
    data= arduino.readline()
    # delete \n\r from arduino
    str = data[:-2].decode()
    # if person exists str = 1 or str = 0
    print(str)
    if str:
        #if picture is taken
        cap = cv2.VideoCapture(0)
        ret, frame = cap.read()
        cv2.imwrite(filename, frame)
        cap.release()
        print('picture is taken')

        #upload in to s3
        s3 = boto3.resource('s3')
        bucketname = 'dongyeon2'
        bucket = s3.Bucket(bucketname)
        bucket.upload_file(filename, filename, ExtraArgs={'ACL': 'public- read'})
        bucketurl = "https://s3-ap-northeast-1.amazonaws.com/dongyeon2/"     +     filename


        db = MySQLdb.connect(host='localhost', user='root',passwd='', db='pythonprogramming')
        cur = db.cursor()

        #insert into sql
        sql = "insert into image(station,year,month,day,img_url) values(%s,%s,%s,%s,%s)"
        cur.execute(sql, (st, ye, mo, da, bucketurl))


        db.commit()
        db.close()

    else:
      print("no body")

这是Arduino代码

int IR_sensor = A0;
int value;

void setup()
{
  Serial.begin(9600);
  pinMode(IR_sensor, INPUT);
}
void loop() {
  long IR_value = analogRead(IR_sensor);
  long IR_range = gp2y0a21yk(IR_value);


  if(IR_range < 50)
  {
    value=1;
    Serial.println(value);
  }
  else {
    value=0;
    Serial.println(value);
  }
  delay(1000);
}

long gp2y0a21yk(long IR_value)
{
  if (IR_value < 10)
  {
    IR_value = 10;
  }

  return ((67870.0 / (IR_value-3.0)) - 40.0)/10;
}

我想要做的是当人通过某个点然后将str改为1然后拍摄该人然后上传到s3并将其保存到sql。如果没有人只打印出没有身体。但是现在我面临的问题是它不起作用，我希望如此。它只出现了 0 没有人 0 没有身体

所以我认为这是因为Arduino保持向python发送数据而python读取str值并在前一个之前转到while子句。先生，你是先生吗？

当python从中获取数据时，停止从arduino获取数据

0 个答案: