Ardinuo知识点与项目实战 （1）简易流水灯void setup() { int i=10; for(i;i<=13;i++) pinMode(i,OUTPUT);//循环一下而已} void loop() { digitalWrite(10,HIGH); digitalWrite(11,LOW); delay(200); digitalWrite(11,HIGH); digitalWrite(12,LOW); delay(200); digitalWrite(12,HIGH); digitalWrite(13,LOW); delay(200); digitalWrite(13,HIGH); digitalWrite(10,LOW); delay(200);} （2）按键控制小灯的开关const int LED=13; //声明变量 LED灯接在13针脚；const int BUTTON=7; //声明变量，按钮接在第7针脚；int val=0; //声明变量，用来存储按钮返回值HIGH或者LOW；int val_old=0;//声明变量，存储上一次按钮返回值；比对val和val_old的值，来判断按钮是按下还是抬起 //valLOW && val_oldHIGHT 抬起状态；valHIGH && val_oldLOW 按下状态；int state=0;//0 off,1 on 声明变量，起到中转的作用，小技巧；void setup() //初始化；{ pinMode(LED,OUTPUT); //定义LED灯输入模式； pinMode(BUTTON,INPUT);//定义BUTTON为输出模式；} void loop() { val=digitalRead(BUTTON);//读取数字针脚的值； if((valHIGH) && (val_oldLOW))//比较前一次和现在的按钮返回的值， //只有现在按下按钮这个状态下，才改变state的值 { state=1-state; } if((valLOW && val_oldHIGH)) //去抖的作用，一般10-15ms； { delay(10); } val_old=val;//把现在按钮返回的值赋予val_old； if(state==1)//控制灯开关； { digitalWrite(LED,HIGH); } else { digitalWrite(LED,LOW); } }第二种方法int buttonState = 0; void setup() {pinMode(13, OUTPUT);pinMode(2, INPUT);}void loop(){buttonState = digitalRead(2);if (buttonState == HIGH) {digitalWrite(13, HIGH);}else {digitalWrite(13, LOW);} 蜂鸣器制作电子琴int buzzer=8;int buzzer2=9;int buzzer3=10;void setup(){pinMode(buzzer,INPUT);pinMode(buzzer2,INPUT);pinMode(buzzer3,INPUT);pinMode(3,OUTPUT);digitalWrite(buzzer,HIGH);digitalWrite(buzzer2,HIGH);digitalWrite(buzzer3,HIGH);}void loop(){ if(digitalRead(buzzer)==LOW) { tone(3,2349); delay(100); noTone(3);} else if(digitalRead(buzzer2)==LOW) { tone(3,2093); delay(100); noTone(3);} else if(digitalRead(buzzer3)==LOW) { tone(3,2637); delay(100); noTone(3);} else noTone(3);}数字控制呼吸灯void setup() { pinMode(11,OUTPUT);}void loop(){for(int i=0;i<=30;i++){analogWrite(11,i);delay(10);}for(int i=30;i>=0;i–){analogWrite(11,i);delay(10); }}呼吸流水灯void setup() { pinMode(3,OUTPUT);pinMode(5,OUTPUT);pinMode(6,OUTPUT);pinMode(8,OUTPUT);pinMode(9,OUTPUT);pinMode(10,OUTPUT);} int level =0;int ports[6]={3,5,6,9,10,11};int idx=0;void loop(){delay(10);analogWrite(ports[idx],level);++level %=7;++idx %=6;}设定小灯IO数字管脚为5，闪烁int ledPin = 5;//设定控制LED的数字IO管脚void setup() {pinMode(ledPin,OUTPUT);}//设定数字IO口的模式，output为输出void loop(){digitalWrite(ledPin,HIGH);//设定PIN5脚为HIGH=5v左右delay(200);digitalWrite(ledPin,LOW);//设定PIN5脚为LOW=0vdelay(200);}利用串口输入字符控制小灯闪烁int ledPin = 13;//设定控制LED的数字IO管脚int val;void setup() {pinMode(ledPin,OUTPUT);//设定数字IO口的模式，output为输出Serial.begin(9600);}//设定波特率为9600void loop(){val=Serial.read();if(-1!=val){if('H’val) {digitalWrite(ledPin,HIGH);//设定PIN5脚为HIGH=5v左右delay(500);digitalWrite(ledPin,LOW);//设定PIN5脚为LOW=0vSerial.print(“Available:”);Serial.println(Serial.available(),DEC);//返回串口缓冲区中当前剩下的字符个数。最多能够缓冲128个字节。 }}}（四）旋转按钮模拟输出控制小灯的亮与暗int ledPin =3;int analogPin =A5;//一个5v，中间A5，一个GNDint val= 0;void setup(){ pinMode(ledPin, OUTPUT);Serial.begin(9600);}void loop(){val = analogRead(analogPin); analogWrite(ledPin, );Serial.println(val);delay(200);}（五）打印hello worldvoid setup() {Serial.begin(9600);}void loop(){Serial.println(“Hello world”);delay(1000);}（六）数码管流动数字制作 int pinDigitron = 2; //管脚D2连接到数码管的A脚，D3连B… D9连h void setup() { for(int x=0; x<8; x++) pinMode(pinDigitron+x, OUTPUT); //设置各脚为输出状态} //在数码管中显示数字的函数void displayDigit(unsigned char digit) { //定义一个数组表：不同数字的abcdefgh各段的取值 unsigned char abcdefgh[][8] = { {1,1,1,1,1,1,0,0}, //0 {0,1,1,0,0,0,0,0}, //1 {1,1,0,1,1,0,1,0}, //2 {1,1,1,1,0,0,1,0}, //3 {0,1,1,0,0,1,1,0}, //4 {1,0,1,1,0,1,1,0}, //5 {1,0,1,1,1,1,1,0}, //6 {1,1,1,0,0,0,0,0}, //7 {1,1,1,1,1,1,1,0}, //8 {1,1,1,1,0,1,1,0}, //9 {1,1,1,0,1,1,1,0}, //A {0,0,1,1,1,1,1,0}, //b {1,0,0,1,1,1,0,0}, //C {0,1,1,1,1,0,1,0}, //d {1,0,0,1,1,1,1,0}, //E {1,0,0,0,1,1,1,0}, //F }; if ( digit >= 16 ) return; for (unsigned char x=0; x<8; x++) digitalWrite( pinDigitron + x, abcdefgh[digit][x] );} void loop() { //在数码管中显示0-9,A-F各个数字 for (int x=0; x<16; x++) { displayDigit(x); //调用displayDigit()子函数，显示数字 delay(1000); //等待1000毫秒 }}（七）蜂鸣器唱小星星int d=262;//1int re=294;//2int mi=330;//3int fa=349;//4int sol=392;//5int la=440;//6int si=494;//7int buzzerPin=7;int ol[43]={d,d,sol,sol,la,la,sol, fa,fa,mi,mi,re,re,d, sol,sol,fa,fa,mi,mi,re, sol,sol,fa,fa,mi,mi,re, d,d,sol,sol,la,la,sol, fa,fa,mi,mi,re,re,d};void setup(){ pinMode(buzzerPin,OUTPUT); }void loop(){ for(int i=0;i<=42;i++) { tone(buzzerPin,ol[i]); delay(100); noTone(buzzerPin); delay(100);} }（七）使用alm35制作温度计平面对人，左脚为正极，右脚负极，中间为模拟输入管脚void setup(){ Serial.begin(9600); }void loop(){ Serial.println(analogRead(0)0.48828125);//输出为摄氏度:5/10241000/10 delay(100); }（八）光敏电阻一脚接5v,一脚负极并需与普通电阻相接，中间插模拟输出管脚void setup(){ Serial.begin(9600); }void loop(){ Serial.println(analogRead(0)); delay(100); }（九）反馈装置，基本功能同上，只是加了一个小灯void setup(){ Serial.begin(9600); pinMode(9,OUTPUT); }void loop(){ analogWrite(9,map(analogRead(0),400,700,0,255));//map 映射 Serial.println(analogRead(0)); delay(100); }（十）红外热人体测距 中间插管脚，一边插gnd void setup(){ pinMode(11,OUTPUT); pinMode(7,INPUT); }void loop(){ if(digitalRead(7)HIGH) digitalWrite(11,HIGH); else digitalWrite(11,LOW); }（十一）检测按钮int pushButton =7;int buttonState=0;int beforeState =0;void setup(){ Serial.begin(9600); pinMode(pushButton,INPUT); }void loop(){ buttonState=digitalRead(pushButton); if(buttonState1 and beforeState1) { Serial.print(“hi~~”); Serial.print(buttonState); } beforeState=buttonState; delay(1);}（十二）电子琴加呼吸灯加电位器int a=0;int analogPin =A5;int b=0;int buzzer=7;int buzzer2=2;int buzzer3=8;int buzzer4=4;int buzzer5=12;void setup(){pinMode(5,OUTPUT);//LED1pinMode(6,OUTPUT);//LED2pinMode(9,OUTPUT);//LED3pinMode(10,OUTPUT);//LED4pinMode(11,OUTPUT);//LED5 pinMode(buzzer,INPUT);pinMode(buzzer2,INPUT);pinMode(buzzer3,INPUT);pinMode(buzzer4,INPUT);pinMode(buzzer5,INPUT);pinMode(3,OUTPUT);digitalWrite(buzzer,HIGH);digitalWrite(buzzer2,HIGH);digitalWrite(buzzer3,HIGH);digitalWrite(buzzer4,HIGH);digitalWrite(buzzer5,HIGH);digitalWrite(11,LOW);//LED1digitalWrite(5,LOW);//LED2digitalWrite(6,LOW);//LED3digitalWrite(9,LOW);//LED4digitalWrite(10,LOW);//LED5}void loop(){ b = analogRead(analogPin); if(digitalRead(buzzer)LOW) { tone(3,262);delay(100);noTone(3); for(int i=a;i<=b;i++) {analogWrite(5,i); delay(10);}for(int i=b;i>=a;i–) {analogWrite(5,i); delay(10);} } else if(digitalRead(buzzer2)LOW) { tone(3,294);delay(100);noTone(3); {for(int i=a;i<=b;i++) {analogWrite(6,i); delay(10);}} for(int i=b;i>=a;i–) {analogWrite(6,i); delay(10);} } else if(digitalRead(buzzer3)LOW) { tone(3,330);delay(100);noTone(3); {for(int i=a;i<=b;i++) {analogWrite(9,i); delay(10);}} for(int i=b;i>=a;i–) {analogWrite(9,i); delay(10);} } else if(digitalRead(buzzer4)LOW) { tone(3,349); delay(100);noTone(3); {for(int i=a;i<=b;i++) {analogWrite(10,i); delay(10);}} for(int i=b;i>=a;i–) {analogWrite(10,i); delay(10);} } else if(digitalRead(buzzer5)LOW) { tone(3,392);delay(100);noTone(3); {for(int i=a;i<=b;i++) {analogWrite(11,i); delay(10);} for(int i=b;i>=a;i–) {analogWrite(11,i); delay(10);} } } else noTone(3);}（十三）电位器控制流水灯与电子琴int analogPin =A5;int ledpin[]={5,6,9,10,11};int i=5;void setup(){for(int i=7;i>=3;i–){pinMode(ledpin[i],OUTPUT);digitalWrite(ledpin[i],HIGH);}//make the led from pinMode(3,OUTPUT);}void loop(){ int a=analogRead(analogPin); int ledlevel=map(a,0,1023,0,i); for(int b=0;b<i;b++) {if(b<ledlevel) {digitalWrite(ledpin[b],HIGH);} else {digitalWrite(ledpin[b],LOW);} }int c=map(a,0,1023,0,5); if(c1) { tone(3,262);delay(100);noTone(3);}else if(c2) {tone(3,294);delay(100);noTone(3); } else if(c3) {tone(3,330);delay(100);noTone(3); } else if(c4) {tone(3,349);delay(100);noTone(3); } else if(c5) {tone(3,392);delay(100);noTone(3); } else noTone(3);}（十四）超声波测距const int TrigPin = 2;const int EchoPin = 3;float cm;void setup() {Serial.begin(9600);pinMode(TrigPin, OUTPUT);pinMode(EchoPin, INPUT);pinMode(8,OUTPUT);}void loop() {digitalWrite(8, LOW);digitalWrite(TrigPin, LOW); //低高低电平发一个短时间脉冲去TrigPin delayMicroseconds(10);digitalWrite(TrigPin, HIGH);delayMicroseconds(10);digitalWrite(TrigPin, LOW);cm = pulseIn(EchoPin, HIGH) / 58.0; //将回波时间换算成cmcm = (int(cm * 100.0)) / 100.0; //保留两位小数Serial.println( pulseIn(EchoPin, HIGH) / 58.0);if (cm>=2 && cm<=10)tone(8, HIGH);delay(100);noTone(8);}(十五)#include<LiquidCrystal.h>//LiquidCrystal lcd(1,2,4,5,6,7);//RS,e,寄存器D4，D5,D6,D7void setup(){lcd.begin(16,2);//定义lcd的尺寸，2行16格 }void loop(){lcd.print(“arduino”);delay(3000);lcd.setCursor(2,1);//（列，行）lcd.print(“LCD Tutorial”);delay(3000);lcd.clear();lcd.blink();//设置闪烁光标delay(4000);lcd.setCursor(7,1);delay(3000);lcd.noBlink();lcd.cursor();//设置为下划线的闪烁光标lcd.noCursor();lcd.clear();}1.gnd2.vcc //5v3.vo 可以加一个电位器来控制显示器的对比度4.rs 选择是否将发送命令或数据到液晶显示器，引脚放在低电位或0v则可以发送命令到液晶显示屏将光标位置放在特定位置，清屏等。高电位或5v，就向LCD发送数据或字符5.r/w 选择模式6.e 写入寄存器，或接下来的数据引脚从D0到D77.D0到D7 date pins|0|0|0|0|0|0|0|，发送这些ascall码到寄存器，有特定表参照 8.a（正极）9.k（负极背光）（十六）lcd闪烁指标#include<LiquidCrystal.h>//byte slash[8]={B00001,B00010,B00100,B01000,B10000,B00000,B00000,B00000 };LiquidCrystal lcd(1,2,4,5,6,7);void setup(){lcd.begin(16,2);//定义lcd的尺寸，2行16格 lcd.createChar(7,slash);}void loop(){for(int i=0;i<=15;i++){lcd.setCursor(i,0);lcd.clear();lcd.write(7);delay(1000);}}（十七）火焰探测器，ao口接模拟接口int fame=A0;int Beep=8;int val=0;void setup(){pinMode(fame,INPUT);Serial.begin(9600);}void loop(){val=analogRead(fame); Serial.println(val); delay(500); }（十八）土壤湿度传感器#define Moisture A0 //定义AO 引脚 为 IO-A0#define DO 7 //定义DO 引脚 为 IO-7 void setup() { pinMode(Moisture, INPUT);//定义A0为输入模式 pinMode(DO, INPUT); Serial.begin(9600);} void loop() { //串口返回测量数据 Serial.print(“Moisture=”); Serial.print(analogRead(Moisture));//读取AO的数值 Serial.print("|DO="); Serial.println(digitalRead(DO));//读取DO的数值 delay(1000);}（十九）烟雾传感器const int gasSensor =0;void setup(){ Serial.begin(9600); // sets the serial port to 9600}void loop(){ float voltage; voltage = getVoltage(gasSensor); Serial.println(voltage); delay(1000);} float getVoltage(int pin){ return (analogRead(pin) * 0.004882814);}（二十）红外传感器int LEDpin = 2;int light = 3; void setup() {pinMode(LEDpin,OUTPUT);pinMode(light,INPUT);Serial.begin(9600);}void loop(){int zhongbest = digitalRead(light);Serial.println(zhongbest);if (zhongbest == 0){digitalWrite(LEDpin,HIGH);delay(1000);digitalWrite(LEDpin,LOW);}else{digitalWrite(LEDpin,LOW);}}（二十一）红外遥控小灯简易版#include <IRremote.h>int RECV_PIN = 11;int LED_PIN = 13;IRrecv irrecv(RECV_PIN);//创建实例decode_results results;//解码void setup(){ Serial.begin(9600); irrecv.enableIRIn(); // 开始接收红外线 pinMode(LED_PIN, OUTPUT); digitalWrite(LED_PIN, HIGH);} void loop() { if (irrecv.decode(&results)) {//如果有接收到信息 Serial.println(results.value, HEX);//16进制输出，BIH就是2进制 if (results.value == 0xFFA25D) //开灯的值 { digitalWrite(LED_PIN, LOW); } else if (results.value == 0xFF629D) //关灯的值 { digitalWrite(LED_PIN, HIGH); } irrecv.resume(); //接收下一个信息 } delay(100);}（二十二）舵机#include<Servo.h>Servo myservo;int pos=0;void setup(){myservo.attach(9);}void loop(){ for(pos=0;pos<=180;pos++) {myservo.write(pos);delay(5);} for(pos=180;pos>=0;pos–) {myservo.write(pos);delay(5);}}（二十三）声控灯int val;void setup() { Serial.begin(9600); pinMode(8,OUTPUT); digitalWrite(8,LOW);} void loop(){ val = analogRead(A0); Serial.println(val); digitalWrite(8,HIGH); if (val > 80) // no voice { digitalWrite(8,HIGH); // clear led delay(3000); } else { digitalWrite(8,LOW); // set led }}（二十四）
来源：CSDN
作者：熬夜耗子在线敲代码
链接：https://blog.csdn.net/weixin_46020788/article/details/104136175