/*drawCircleHelper(int32_t x0, int32_t y0, int32_t r, uint8_t cornername, uint32_t color),在x和y位置使用r和color，绘制一个缺口为cornername度的圆fillCircleHelper(int32_t x0, int32_t y0, int32_t r, uint8_t cornername, int32_t delta, uint32_t color),在x和y位置使用r rad...
result = value1 + value2; result = value1 - value2; result = value1 * value2; result = value1 / value2; Parameters: value1: 任何常量或者变量,value2: 任何常量或者变量 编程小提示 整型常量的默认值是 int 类型,所以一些整型常量(定义中)的计算会导致溢出.(比如: 60 * 1000 会得 到一个负...
Additional Knowledge How to use the multiple passwords for keypad How to input a multiple digits number using the keypad Challenge Yourself Display the pressed key of the keypad on LCD.Hint:Refer toArduino - LCD Make a door lock with password protection using the keypad. ...
//#define LOAD_FONT8N // Font 8. Alternative to Font 8 above, slightly narrower, so 3 digits fit a 160 pixel TFT #define LOAD_GFXFF // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts // Comment out the #define below to stop the SPIFFS f...
问如何在Arduino上格式化一个长的增加千位分隔符EN在大多数的计算机系统上，Linux 或者是其它，当你插入...
2 int isalpha( int c ) Returns 1 if c is a letter and 0 otherwise. 3 int isalnum( int c ) Returns 1 if c is a digit or a letter and 0 otherwise. 4 int isxdigit( int c ) Returns 1 if c is a hexadecimal digit character and 0 otherwise. (See Appendix D, Number Systems, for...
length : the number of bytes to read (int) Returns byte readString() Description 读取字符到一个字符串,直到超时 Serial.readString() reads characters from the serial buffer into a string. The function terminates if it times out (see setTimeout()). This function is part of the Stream clas...
u8g2.begin(); } uint8_t m = 24; void loop(void) { char m_str[3]; strcpy(m_str, u8x8_u8toa(m, 2)); /* convert m to a string with two digits */ u8g2.firstPage(); do { u8g2.setFont(u8g2_font_logisoso62_tn); ...
1.itoa()：将整型值转换为字符串。 用法itoa(int,char*,int) 即(要转化的整形数，目标字符数组...
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() 12.3 int() 12.4 word() 12.5 long() 12.6 float() 十三、变量作用域 & 修饰符 13.1 variable scope(变量的作用域) ...