arduino与树莓派通信的版本编码问题 - 夜owl - 博客园

简单介绍一下：arduino与树莓派通信，Python3 和Python2的版本有不同的编码方法。如果你不注意它，它会导致通信错误或操作错误。 的版本代码，python也可以实现，反之亦然。

问题解决：

代码简介

arduino代码

volatile float dist;  float checkdistance_4_7() {   digitalWrite(4, LOW);   delayMicroseconds(2);   digitalWrite(4, HIGH);   delayMicroseconds(10);   digitalWrite(4, LOW);   float distance = pulseIn(7, HIGH) / 58.00;   delay(10);   return distance; }  void setup(){   Serial.begin(9600);   dist = 0;   pinMode(4, OUTPUT);   pinMode(7, INPUT); }  void loop(){   dist = checkdistance_4_7();   //Serial.println(String(dist)   String("cm"));      if ( Serial.available())     {       if('s' == Serial.read())         Serial.println(dist);      }  }

Python2正常运行代码

# -*- coding:UTF-8 -*- import serial    #import serial module ser = serial.Serial('/dev/ttyACM0', 9600,timeout=1);   #open named port at 9600,1s timeot  #try and exceptstructure are exception handler try:   while 1:     ser.write('s');#writ a string to port     response = ser.readall();#read a string from port     print response; except:   ser.close();

7.28 10.28 ...

Python3的运行代码

# -*- coding:UTF-8 -*- import serial    #import serial module ser = serial.Serial('/dev/ttyACM0', 9600,timeout=1);   #open named port at 9600,1s timeot  #try and exceptstructure are exception handler try:   while 1:     ser.write('s'.encode('utf-8'));#writ a string to port     response = ser.readall()#read a string from port     print(response) except:   ser.close();   print(111)

输出

b'7.28\r\n' b'10.28\r\n' ...

对比可以知道函数语法不同:

ser.write('R'.encode()); print (response);

Python3.转换编码代码

# -*- coding:UTF-8 -*- import serial    #import serial module ser = serial.Serial('/dev/ttyACM0', 9600,timeout=1);   #open named port at 9600,1s timeot  #try and exceptstructure are exception handler try:   while 1:     ser.write('s'.encode('utf-8'));#writ a string to port     response = ser.readall().decode()#read a string from port     print(response) except:   ser.close();   print(111)

不同点

response = ser.readall().decode()#read a string from port

最终实现效果跟2 一样。还有。还有python2也能运行

7.28 10.28 ...

总结

这实际上是一个非常简单的编码问题，

Python 2 处理字符串 bytes 类型。 Python 3 处理字符串 unicode 类型。