将另一个数字后的数字转换为2个algarisms数字? (1然后1 = 11) - Arduino

时间:2013-02-23 20:12:06

标签: arduino numbers calculator infrared

所以,我正在尝试用Arduino设置一种计算器。我已经设法从红外遥控器读取数据并将其显示在LCD 16x2显示器中。例如,如果输入“1”,显示屏上将显示“1”,但如何让程序理解如果在输入按钮之前按下两个或更多数字,则它是一个超过1的数字algarism?就像按1,然后2然后3等于123?

我可以做很多if语句来执行类似“如果1在现有1之后被按下而不是变量== 11”等等,但是这没有用。

无论如何,我该怎么做?或者你能指出我这种功能/算法的名称,所以我可以期待它。

感谢。

1 个答案:

答案 0 :(得分:0)

以下是两种解决方法。 1st将简单地连接一个字符串类型,并在Carriage Return完成后将其转换为整数。

#define _CR 13
String readString;

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

void loop() {
  while (Serial.available()) {
    char c = Serial.read();  //gets one byte from serial buffer
    readString += c; //makes the string readString
    delay(2);  //slow looping to allow buffer to fill with next character
  }

  if ((readString.length() >0) || ( c == CR_)) {
    Serial.println(readString);  //so you can see the captured string 
    int n = readString.toInt();  //convert readString into a number

    // do whatever you want
    // ...
    //
    //

    readString=""; //empty for next input
  } 
}

另一种方法是使用Inter Character Timeout。请注意,通常

while (!Serial.available()) {
  // wait for Serial input
};
inkey = Serial.read();

正在阻止。下面使用char数组的指针来构建输入,最多5位数字int16_t(即65535)的长度。嗯它只处理积极因素。但你可以调整它以获得否定,以及其他命令,如“+”,“ - ”等......

我使用ICT方法的原因是因为Arduino的IDE串行监视器实用程序默认为No LF / CR。它只是立即发送输入而没有任何LF / CR。

int16_t last_ms_char; // milliseconds of last recieved character from Serial port.
int8_t buffer_pos; // next position to recieve character from Serial port.
char buffer[6]; // 0-35K+null
int16_t fn_index;
int16_t Serial_Input_Number;

void setup() {

  Serial.begin(115200);
  last_ms_char = millis(); // stroke the inter character timeout.
  buffer_pos = 0; // start the command string at zero length.

}

void loop() {

  char inByte;
  if (Serial.available() > 0) {
    inByte = Serial.read();
    if (isDigit(inByte)) { // macro for ((inByte >= '0') && (inByte <= '9'))
      // else if it is a number, add it to the string
      buffer[buffer_pos++] = inByte;
    } else {
      // input char is a letter command
      buffer_pos = 0;
      parse_menu(inByte);
    }
    buffer[buffer_pos] = 0; // update end of line
    last_ms_char = millis(); // stroke the inter character timeout.

  } else if ((millis() - last_ms_char) > 500 && ( buffer_pos > 0 )) {
    // ICT expired and have something
    if (buffer_pos == 1) {
      // look for single byte (non-number) menu commands
      parse_menu(buffer[buffer_pos - 1]);

    } else if (buffer_pos > 5) {
      // dump if entered command is greater then uint16_t
      Serial.println(F("Ignored, Number is Too Big!"));

    } else {
      // otherwise its a number, scan through files looking for matching index.
      Serial_Input_Number = atoi(buffer);

      //
      //
      // Do something with "Serial_Input_Number"
      // one time here. Or set flag and do something out of this big if
      // ...
      //
      //


    }

    //reset buffer to start over
    buffer_pos = 0;
    buffer[buffer_pos] = 0; // delimit

    //
    //
    // do other stuff repeatedly between new characters
    // ...
    //
    //
  }

无法保证确切的代码,因为它从较大的示例中进行了修剪和修剪,确实有效。