我正在使用两个Arduino板,使用NewSoftSerial和RF收发器相互发送纯文本字符串。
每个字符串可能有20-30个字符长度。如何将
每个字符串可能有20-30个字符长度。如何将
Serial.read()
转换为字符串,以便我可以执行if x == "testing statements"
等操作?Serial.read()
转换为字符串,以便我可以执行if x == "testing statements"
等操作?在serial.read()
上使用字符串追加运算符,它比string.concat()
效果更好。
char r;
string mystring = "";
while(serial.available()){
r = serial.read();
mystring = mystring + r;
}
许多伟大的答案,这是我对问题中要求的确切功能的两分钱。
此外,它应该更容易阅读和调试。
代码经过128个字符的输入测试。
在Arduino uno r3(Arduino IDE 1.6.8)上测试。
功能:
命令:
注意:记得根据你的板速度更改波特率。
// Turns Arduino onboard led (pin 13) on or off using serial command input.
// Pin 13, a LED connected on most Arduino boards.
int const LED = 13;
// Serial Input Variables
int intLoopCounter = 0;
String strSerialInput = "";
// the setup routine runs once when you press reset:
void setup()
{
// initialize the digital pin as an output.
pinMode(LED, OUTPUT);
// initialize serial port
Serial.begin(250000); // CHANGE BAUD RATE based on the board speed.
// initialized
Serial.println("Initialized.");
}
// the loop routine runs over and over again forever:
void loop()
{
// Slow down a bit.
// Note: This may have to be increased for longer strings or increase the iteration in GetPossibleSerialData() function.
delay(1);
CheckAndExecuteSerialCommand();
}
void CheckAndExecuteSerialCommand()
{
//Get Data from Serial
String serialData = GetPossibleSerialData();
bool commandAccepted = false;
if (serialData.startsWith("LED.ON"))
{
commandAccepted = true;
digitalWrite(LED, HIGH); // turn the LED on (HIGH is the voltage level)
}
else if (serialData.startsWith("LED.OFF"))
{
commandAccepted = true;
digitalWrite(LED, LOW); // turn the LED off by making the voltage LOW
}
else if (serialData != "")
{
Serial.println();
Serial.println("*** Command Failed ***");
Serial.println("\t" + serialData);
Serial.println();
Serial.println();
Serial.println("*** Invalid Command ***");
Serial.println();
Serial.println("Try:");
Serial.println("\tLED.ON");
Serial.println("\tLED.OFF");
Serial.println();
}
if (commandAccepted)
{
Serial.println();
Serial.println("*** Command Executed ***");
Serial.println("\t" + serialData);
Serial.println();
}
}
String GetPossibleSerialData()
{
String retVal;
int iteration = 10; // 10 times the time it takes to do the main loop
if (strSerialInput.length() > 0)
{
// Print the retreived string after looping 10(iteration) ex times
if (intLoopCounter > strSerialInput.length() + iteration)
{
retVal = strSerialInput;
strSerialInput = "";
intLoopCounter = 0;
}
intLoopCounter++;
}
return retVal;
}
void serialEvent()
{
while (Serial.available())
{
strSerialInput.concat((char) Serial.read());
}
}
我可以这样做:
void setup() {
Serial.begin(9600);
}
void loop() {
String message = "";
while (Serial.available())
message.concat((char) Serial.read());
if (message != "")
Serial.println(message);
}
这个方法对我总是有效的 :)
String _SerialRead = "";
void setup() {
Serial.begin(9600);
}
void loop() {
while (Serial.available() > 0) //Only run when there is data available
{
_SerialRead += char(Serial.read()); //Here every received char will be
//added to _SerialRead
if (_SerialRead.indexOf("S") > 0) //Checks for the letter S
{
_SerialRead = ""; //Do something then clear the string
}
}
}