将整个变量从 raspberrypi (python) 发送到 arduino 时出错

Question

我想通过串行通信将存储在变量"int3"中的数字“500”从python传输到arduino。 arduino 使用 Serial.read() 读取数据，但只打印“5”。提前致谢。我要从 python 发送 int3、字节 2 和字节 3，但希望 arduino 打印 int3 的值。

import serial
import time
ser=serial.Serial('/dev/ttyACM0',9600)
int3 = 500
int3 = b'%d' %int3
while (1):

    ser.write(int3)
    ser.write(b'2')
    ser.write(b'3')
#print type(ser.write)
    time.sleep(1)
    print(int3)

String r;

void setup(){
  Serial.begin(9600);
//  while(!Serial)
//  {
//    ;
//  }
}
void loop(){
  if(Serial.available() > 0){  
    r =(Serial.read() - 0);  //conveting the value of chars to integer
Serial.print(r[0]);


delay(100);
//while(Serial.available () !=0) r=Serial.read();
}



}

Answer 1

将 if 替换为 while 循环：

String fromRaspberry;
void loop(){
  char c;
  while (Serial.available() > 0) {  
    c = Serial.read(); //read char
    fromRaspberry += c; //add the read char to string
  }
  int x = fromRaspberry.toInt(); //convert string to int
  Serial.println(x);
  // clear the string for new input:
  fromRaspberry = "";
}

将整个变量从 raspberrypi (python) 发送到 arduino 时出错

Error in sending entire variable from raspberrypi (python) to arduino

arduino

serial-communication

pyserial