Serial.print()
往串口发数据，无换行
- 描述
以人类可读的ASCII码形式向串口发送数据，该函数有多种格式。整数的每一数位将以ASCII码形式发送。浮点数同样以ASCII码形式发送，默认保留小数点后两位。字节型数据将以单个字符形式发送。字符和字符串会以其相应的形式发送。例如：
Serial.print(78) 发送 "78"
Serial.print(1.23456) 发送 "1.23"
Serial.print('N') 发送 "N"
Serial.print("Hello world.") 发送 "Hello world."
可选的第二个参数用于指定数据的格式。允许的值为：BIN (binary二进制), OCT (octal八进制), DEC (decimal十进制), HEX (hexadecimal十六进制)。对于浮点数，该参数指定小数点的位数。例如：
Serial.print(78, BIN) gives "1001110"
Serial.print(78, OCT) gives "116"
Serial.print(78, DEC) gives "78"
Serial.print(78, HEX) gives "4E"
Serial.println(1.23456, 0) gives "1"
Serial.println(1.23456, 2) gives "1.23"
Serial.println(1.23456, 4) gives "1.2346"
你可以用F()把待发送的字符串包装到flash存储器。例如：
Serial.print(F(“Hello World”))
要发送单个字节数据，请使用Serial.write()。
- 语法：
Serial.print(val) Serial.print(val, format)
- 参数：
val: 要发送的数据（任何数据类型）
format: 指定数字的基数（用于整型数）或者小数的位数（用于浮点数）。
- 返回值：<>
size_t (long): print()返回发送的字节数（可丢弃该返回值）。
- 示例：
/*
Uses a FOR loop for data and prints a number in various formats.
*/
int x = 0; // variable
void setup() {
Serial.begin(9600); // open the serial port at 9600 bps:
}
void loop() {
// print labels
Serial.print("NO FORMAT"); // prints a label
Serial.print("\t"); // prints a tab
Serial.print("DEC");
Serial.print("\t");
Serial.print("HEX");
Serial.print("\t");
Serial.print("OCT");
Serial.print("\t");
Serial.print("BIN");
Serial.print("\t");
for(x=0; x< 64; x++){ // only part of the ASCII chart, change to suit
// print it out in many formats:
Serial.print(x); // print as an ASCII-encoded decimal - same as "DEC"
Serial.print("\t"); // prints a tab
Serial.print(x, DEC); // print as an ASCII-encoded decimal
Serial.print("\t"); // prints a tab
Serial.print(x, HEX); // print as an ASCII-encoded hexadecimal
Serial.print("\t"); // prints a tab
Serial.print(x, OCT); // print as an ASCII-encoded octal
Serial.print("\t"); // prints a tab
Serial.println(x, BIN); // print as an ASCII-encoded binary
// then adds the carriage return with "println"
delay(200); // delay 200 milliseconds
}
Serial.println(""); // prints another carriage return
}
