Python serial.write() 不会向 Arduino 发送串行数据

问题描述

我正在编写一个 Python 脚本，它向 Arduino 发送一个字符，然后 Arduino 将接收到的字符打印回来.但在这种情况下，Arduino 总是给出一个垃圾值.执行 Python 脚本时也没有错误.

I am writing a Python script, that sends a character to an Arduino and the Arduino prints the received character back. But in this case, the Arduino is always giving a garbage value. Also there is no error while executing the Python script.

我查阅了多篇博客、文章和教程，并按照具体步骤操作，但没有找到解决方案.

I have checked multiple blogs, articles and tutorials and followed the exact steps, but I got no solution.

这是我的 Python 脚本:

This is my Python script:

import serial
ser = serial.Serial("/dev/ttyACM0",9600)
ser.write('8')
read=ser.readline()
print(read)

这是 Arduino 代码:

This is the Arduino code:

int temp;
void setup() {
  Serial.begin(9600);
  temp=5;
}

void loop() {
  temp=Serial.read();
  Serial.println(temp);
  delay(1000);
}

Arduino 总是打印 -1 作为响应.

Arduino always prints -1 in response.

推荐答案

上的文档Serial.read():

退货

可用传入串行数据的第一个字节(如果没有可用数据，则为 -1) - int

the first byte of incoming serial data available (or -1 if no data is available) - int

按照 Ivan Sheigets 的建议或

So do as Ivan Sheigets suggested or

void setup() {
  Serial.begin(9600);
  Serial.print("You sent: ");
}

void loop() {
  int temp=Serial.read();
  if(temp>=0)
    Serial.print((char)temp);
}

确保将传入的值转换为 char (char)temp.

Make sure to cast the incoming value to char (char)temp.

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