也就是说const定义的常量占用了内存空间,而define定义的常量只是在编译时,将所有常量名替换成对应的值,上面的例子中,我们可以理解:println中直接打印了3.14159,而不是从内存中提取的值。define定义常量好处是不消耗内存空间,所以Arduino内置的很多常量是用define定义的。但不好的地方是:我们在编写程序的时候,如果使用def...
constintled=LED_BUILTIN;constintpinBeep=8;// pwmconstintpinIrDrvs[]={0,3,9};// pwmconstintpinBtn=1;UARTpc1(4,5,NC,NC);// NC 即Not Connected,未连接,此处表示UARTpc0(16,17,-1,-1);// 不使用硬件流控制; -1 等价于 NCconstintpinDE=18;constintpinADCs[]={26,27,28};constintp...
int Digital_Value=0;float temp_Value=0;void setup(){ Serial.begin(9600); //波特率设置为9600 //由于测温范围为0～100℃,输出电压为0～1V,采用内部1.1V参考电压analogReference(INTERNAL);}void loop(){ Digital_Value=analogRead(A0); //读取电压值(数字量) temp_Value=(float)Digital_Value/1023*110.0...
int Digital_Value=0;float temp_Value=0;void setup(){ Serial.begin(9600); //波特率设置为9600 //由于测温范围为0～100℃,输出电压为0～1V,采用内部1.1V参考电压analogReference(INTERNAL);}void loop(){ Digital_Value=analogRead(A0); //读取电压值(数字量) temp_Value=(float)Digital_Value/1023*110.0...
#define ONE_WIRE_BUS 2 //定义单总线连接的端口 OneWire oneWire(ONE_WIRE_BUS); DallasTemperature sensors(&oneWire); void setup(void) { Serial.begin(9600); Serial.println("Dallas Temperature IC Control Library Demo"); sensors.begin(); //启动单总线 } void loop(void) { Serial.print("Reques...
// SerialMouse sketch #define potXPin 4 #define potYPin 5 void setup() { Serial.begin(9600); } void loop() { int x = analogRead(potXPin); int y = analogRead(potYPin); Serial.print(x,DEC); Serial.print(","); Serial.print(y,DEC); Serial.println(); // send a cr/lf delay(...
#include <SI4735.h> #define RESET_PIN 16 // Arduino Nano / UNO pin A2 SI4735 rx; void setup() { rx.setup(RESET_PIN, FM_FUNCTION); rx.setFM(8400, 10800, currentFrequency, 10); delay(500); rx.setRdsConfig(3, 3, 3, 3, 3); rx.setFifoCount(1); } char *utcTime; char *...
#include <FAB_LED.h> const uint16_t numPixels = 16; ws2812b<D,6> myLeds; #define RED(x, i) x[i] #define GREEN(x, i) x[i+1] #define BLUE(x, i) x[i+2] void colorN(uint8_t red, uint8_t green, uint8_t blue) { // We multiply by 3 because A pixel is 3 bytes...
int16_tdrawRightString(constchar*string,int32_tx,int32_ty,uint8_tfont)int16_tdrawRightString(constString&string,int32_tx,int32_ty,uint8_tfont) 4. 绘制字符 int16_tdrawChar(uint16_tuniCode,int32_tx,int32_ty)int16_tdrawChar(uint16_tuniCode,int32_tx,int32_ty,uint8_tfont)voiddraw...
These functions are faster than the previous ones. They differ from the original Arduino functions by the type of pin parameter - they useGPIO_pin_tinstead ofuint8_t(orint). So in your program, you define the pin as GPIO_pin_t pin = DP1; ...