Arduino的與樹莓Pi的串行接口技術來傳送2個數據

Question

/* 
    String to Integer conversion 

Reads a serial input string until it sees a newline, then converts 
the string to a number if the characters are digits. 

The circuit: 
No external components needed. 

created 29 Nov 2010 
by Tom Igoe 

This example code is in the public domain. 
*/ 
#include <LiquidCrystal.h> 
LiquidCrystal lcd(23, 22,13,12,11,10); 
String inString = ""; // string to hold input 

void setup() { 
    // Open serial communications and wait for port to open: 
    Serial.begin(19200); 
    while (!Serial) { 
    ; // wait for serial port to connect. Needed for native USB port only 
    } 
    lcd.begin(20, 4); 

    // send an intro: 
    //println("\n\nString toInt():"); 
    //Serial.println(); 
} 

void loop() { 
    // Read serial input: 
    while (Serial.available() > 0) { 
    lcd.setCursor(0,0); 
    lcd.print("welcome"); 
    int inChar = Serial.read(); 
    if (isDigit(inChar)) { 
     // convert the incoming byte to a char 
     // and add it to the string: 
     inString += (char)inChar; 
    } 
    // if you get a newline, print the string, 
    // then the string's value: 
    if (inChar == '\n') { 
     int data = inString.toInt() ; 
     lcd.setCursor(0,1); 
     lcd.print("speed: "); 
     lcd.println(data); 
     if(data > 50){ 
     lcd.setCursor(0,2); 
     lcd.print("Over speed"); 
     } 
     else{ 
     lcd.setCursor(0,2); 
     lcd.print("Under speed limit "); 
     } 

    // Serial.print("Value:"); 
     //Serial.println(inString.toInt()); 
     //Serial.print("String: "); 
     //Serial.println(inString); 
     // clear the string for new input: 
     inString = ""; 
    } 
    } 
} 

在使用串行監控用的Arduino此代碼的工作，但與樹莓裨運行接口的Arduino時，僅「歡迎」信息來在LCD上而不是我通過Raspberry Pi傳輸的數據（2位數字），可能是由於Raspberry Pi上的Python程序或其他原因。

Answer 1

您正在檢查「\ n」，但從未發送過一個。所以你永遠不會觸發

如果（INCHAR ==「\ n」）