Raspberry Pi 到 Arduino 连续串行通信

Question

I want to send data from my Raspberry Pi to Arduino using the pyserial library from the side of Raspberry Pi. I just used a USB to connect the two devices. First I uploaded a program to the Arduino that checks if there is an available serial data then I am going to read it and compare the received data using if else statements. It works properly if I set the delay between writing to the serial port every 5 seconds in the Python program but if I set the delay to 1 second, it reads it at random times. I just use Windows for now to test it before I run on it on the Raspberry Pi. Is there any way I can make the sending of data faster rather than adding a 5 seconds delay? Below is the sample code I wrote.

Python

import serial
import time

port=serial.Serial('COM8',9600)
time.sleep(5)

try:

    while True:
        port.write(b'Hi\n')
        time.sleep(5)
except:
    port.close()

Arduino

String dataIn;
int led = 13;

void setup()
{
  Serial.begin(9600);

  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);

  Serial.flush();
}

void loop()
{
  if (Serial.available())
  {
    dataIn = Serial.readStringUntil("\n");

    if (dataIn == "Hi\n")
    {
      digitalWrite(led, HIGH);
      delay(1000);
      digitalWrite(led, LOW);
      delay(1000);
    }

    Serial.flush();
    dataIn = "";
  }
}

Answer 1

i would recommend using String lib like the below

  String command;


  void loop() { 
  if (Serial.available()) 
  {
    command = Serial.readStringUntil('\n');
    command.trim();
    command.equals("something");
    /*your Implementation here*/
  }
}

it works well for me