int inByte = myPort.read(); // if this is the first byte received, and it’s an A, // clear the serial buffer and note that you‘ve // had first contact from the microcontroller. // Otherwise, add the incoming byte to the array: if (firstContact == false) { if (inByte ==...
ble.gatts_write(tem_handle, struct.pack("<B", int(100))) # 对所有连接上的蓝牙设备发送数据,蓝牙只能连接一个中心设备,所以conn_handles只有一个0值 # 很多文章直接写成ble.gatts_notify(0, tem_handle) for handle in conn_handles: # Notify connected centrals to issue a read. ble.gatts_notify(...
4);}voidsend_float_data(){floathypoTemp=-12.34;// 假想的从传感器获得温度值 0xC14570A4uint8_tbyteArrTemp[4];// 声明一个用来存储 4 字节的字节数组convFloatToByteArr(hypoTemp,byteArrTemp);// 调用Serial.write(byteArrTemp,4);// 写入串口}...
步骤:int,使结果平滑的步骤数。1到10的有效值。更高的步长等于更平滑,但处理时间缩短。 *:启用此功能将使平滑效果更好,但处理时间缩短。* 1 2 3 4 voidsetup(){ compass.init(); compass.setSmoothing(10,true); } 9、校准QMC5583L传感器 QMC5883LCompass库包含校准功能和实用程序大纲,可帮助您校准QMC5883...
intcs = 11; intdin = 12; unsignedchardisp1[12][8] = { {0x3C, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3C},//0 {0x08, 0x18, 0x28, 0x08, 0x08, 0x08, 0x08, 0x08},//1 {0x7E, 0x2, 0x2, 0x7E, 0x40, 0x40, 0x40, 0x7E},//2 ...
intret=dht11.read(); if(ret==DHTLIB_ERROR_CHECKSUM) { Serial.println("(E) Checksum failed"); return; } elseif(ret==DHTLIB_ERROR_TIMEOUT) { Serial.println("(E) Read time out"); return; } Serial.print("Humidity: "); Serial.print((float)dht11.getHumidity(),2); ...
#include#include#define SERIAL_RATE 31250 // Midi standard serial rate is 31250 baud#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))const byte SD_SELECT = 10; // Chipselectfor Sd card is pin 10const char*loopfile = "LOOPDEMO.MID";// pointer to midifileonSD cardconst int button...
void preprocessString(char *str) { for (int i = 0; str[i] != '\0'; i++) { if (str[i] == ' ') { str[i] = '_'; // 替换空格为下划线 } } } 问题2:内存不足 原因:频繁的字符串操作可能导致内存碎片或溢出。 解决方法:尽量减少动态内存分配,使用静态数组或预分配足够的内存。...
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 13.1 variable scope(变量的作用域) 13.2 static(静态变量) ...