python和arduino之间的串行通信

Question

我正在研究物体跟踪机器人。我正在使用python和OpenCV来检测对象并将正确的数据发送到控制两个伺服电机的arduino。应发送到arduino的数据是伺服电机角度范围在0-180之间。我正在使用示例代码来理解python和arduino如何使用串行总线进行通信。当我发送一个数字时，arduino接收它并按预期工作，但是当我发送多个数字时没有任何反应。这是arduino代码：

#include <Servo.h>
int data;
Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards
int pos = 0;    // variable to store the servo position

void setup() { 
  Serial.begin(9600); //initialize serial COM at 9600 baudrate
  pinMode(LED_BUILTIN, OUTPUT); //make the LED pin (13) as output
  digitalWrite (LED_BUILTIN, LOW);
  myservo.attach(9);
  Serial.println("Hi!, I am Arduino");
}

void loop() {
while (Serial.available()){
 //to receive more than one character 
 char buffer[] = {' ',' ',' ',' ',' ',' ',' '}; // Receive up to 7 bytes
 while (!Serial.available()); // Wait for characters
 Serial.readBytesUntil('n', buffer, 7);
 data = atoi(buffer);

}
myservo.write(data);
}

这是python代码：

import serial
import time  # Required to use delay functions

arduinoSerialData = serial.Serial('com14', 9600)  # Create Serial port 
object called arduinoSerialData
time.sleep(2)  # wait for 2 secounds for the communication to get 
established

print arduinoSerialData.readline()  # read the serial data and print it as 
line
print ("Enter 1 to turn ON LED and 0 to turn OFF LED")

while 1:  # Do this forever

    var = raw_input()  # get input from user
    print "you entered", var  # print the intput for confirmation

    arduinoSerialData.write(var)