int num1 = 123; float num2 = 3.14; const char* str = "Hello, Arduino!"; String str1 = String::format("num1 = %d, num2 = %.2f, str = %s", num1, num2, str); // 输出字符串:num1 = 123, num2 = 3.14, str = Hello, Arduino! 使用这两种方式,可以在 Arduino 中方便地将 ...
void send_sensor_data() { float hypoTemp = -12.34; // 假想的从传感器获得温度值 0xC14570A4 uint8_t charArr[4]; // 用来存储 4 字节的字节数组 uint8_t *p; p = (uint8_t*) &hypoTemp; // 让指针指向浮点数所在的内存 for(int i=0; i<4; i++) { charArr[i] = *p++; // 读...
11.10 unsigned long(无符号长整数型) 11.11 float(浮点型数) 11.12 double(双精度浮点数) 11.13 string( char array/字符串) 11.14 String object( String类) 11.15 array(数组) 十二、数据类型转换 12.1 char() 12.2 byte() 12.3int() 12.4 word() 12.5 long() 12.6 float() 十三、变量作用域&修饰符 1...
将草图另存为array_example。 更新代码,如下所示: int numbers[5]; int moreNumbers[5] = {1,2,3,4,5}; void setup() { // put your setup code here, to run once: Serial.begin(9600); } void loop() { // put your main code here, to run repeatedly: for(int i = 0; i < 5; i...
(range:0 - 1023) to int8_t array (range:-128 - 127) summ += data[i]; while (micros() < (microseconds + sampling_period_us)) { // Timing out uC ADC to fulfill sampling frequency requirement } } // Eliminating remaining DC component (produces usable data in FFT bin #0, which ...
float f=3.1415; char c[]; dtostrf(f,1,2,c); Serial.println(c); 1. 2. 3. 4. 此时从Arduino自带串口监视器中将输出3.14,即成功实现了数据类型转换。 数据转换之后,我们可以对字符串进行一个拼接。如下,将实现字符串的拼接 float f=3.1415; ...
the display colours i = 1 invert, i = 0 normal 反转屏幕的颜色decodeUTF8(uint8_t c) //Serial UTF-8 decoder with fall-back to extended ASCIIdecodeUTF8(uint8_t *buf, uint16_t *index, uint16_t remaining) //Line buffer UTF-8 decoder with fall-back to extended ASCIIdrawChar(uint16_...
char myJson[] = "{\"myChar\":\"hello\",\"myArray\":[13,14],\"myObject\":{\"myFloat\":3.1415926}}"; void setup() { Serial.begin(115200); Serial.println(); //StaticJsonDocument<200> doc; //声明一个JsonDocument对象 DynamicJsonDocument doc(200); //声明一个JsonDocument对象 ...
= = = || ! ++ -- += -= *= /= 数据类型: boolean 布尔类型 2 Arduino 手册(精要版) char byte 字节类型 int unsignedint long unsignedlong float double string array void 数据类型转换: char() byte() int() long() float() 常量: HIGH|LOW 表示数字IO 口的电平,HIGH 表示高 电平(1),...
To print a float16, one need to convert it with toFloat(), toDouble() or toString(decimals). The latter allows concatenation and further conversion to an char array. In pre 0.3.0 version the Printable interface was implemented, but it has been removed as it caused excessive memory usage...