Projeto 1: “Olá mundo!”
int val;// define variable val
void setup()
{
  Serial.begin(9600);// set the baud rate at 9600 to match the software settings. When connected to a specific device, (e.g. Bluetooth), the baud rate needs to be the same with it.
}
void loop()
{
  val=Serial.read();// read the instruction or character from PC to Arduino, and assign them to Val.
  if(val=='R')//  determine if the instruction or character received is “R”
  {  // if it’s “R”
   Serial.println("Hello World!");// display “Hello World!”
  }
}


Projeto 2: “Quem está a piscar?”
int ledPin = 11; // define digital pin 11
void setup()
{
pinMode(ledPin, OUTPUT);// define LED pin as output
}
void loop()
{
analogWrite(ledPin,255); //set the LED on, regulate light brightness, ranging from 0-255, 255 is the brightest
delay(1000); // wait for a second
digitalWrite(ledPin, LOW); // set the LED off
delay(1000); // wait for a second
}


Projeto 3: Respiração visível
int ledPin = 11; // define digital pin 11
void setup()
{
pinMode(ledPin, OUTPUT);// define LED pin as output
}
void loop()
{
for (int a=0; a<=255;a++)// set the LED to be brighter gradually  { analogWrite(ledPin,a); // turn on LED, regulate light brightness, ranging from 0-255, 255 is the brightest delay(10); // wait for 0.01S } for (int a=255; a>=0;a--) // set LED to be dimming gradually
{
analogWrite(ledPin,a); // turn on LED, regulate light brightness, ranging from 0-255, 255 is the brightest
delay(10); // wait for 0.01S
}
delay(1000);// wait for 1S
}


Projeto 4: Luz a fluir  
int BASE = 9 ;  // the I/O pin for the first LED
int NUM = 3;   //  number of LEDs
void setup()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     pinMode(i, OUTPUT);   // set I/O pins as output
   }
}
void loop()
{
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, HIGH);    //set I/O pins as “high”, turn on LEDs one by one
     delay(200);        // wait 0.2S
   }
   for (int i = BASE; i < BASE + NUM; i ++) 
   {
     digitalWrite(i, HIGH);    // set I/O pins as “low”, turn off LEDs one by one
     delay(200);        // wait 0.2S
   }  
}


Projeto 5: Fazer um som
int buzzPin =  10; // Connect Buzzer to D10
void setup()  
{        
 pinMode(buzzPin, OUTPUT);  // set I/O pin as “output” 
}
void loop()                    
{
 digitalWrite(buzzPin, HIGH);// set digital I/O output as “high”, the buzzer will sound
 delay(500);// wait for 0.5S
 digitalWrite(buzzPin, LOW);// set digital I/O output as “low”, the buzzer will stop making sound
 delay(500); // wait for 0.5S      
}


Projeto 6: “Quem está a cantar?”
#define D0 -1
#define D1 262
#define D2 293
#define D3 329
#define D4 349
#define D5 392
#define D6 440
#define D7 494
#define M1 523
#define M2 586
#define M3 658
#define M4 697
#define M5 783
#define M6 879
#define M7 987
#define H1 1045
#define H2 1171
#define H3 1316
#define H4 1393
#define H5 1563
#define H6 1755
#define H7 1971
// List all D tune frequency
#define WHOLE 1
#define HALF 0.5
#define QUARTER 0.25
#define EIGHTH 0.25
#define SIXTEENTH 0.625
// list all tempos
int tune[]=        // List each frequency according to numbered musical notation
{
  M3,M3,M4,M5,
  M5,M4,M3,M2,
  M1,M1,M2,M3,
  M3,M2,M2,
  M3,M3,M4,M5,
  M5,M4,M3,M2,
  M1,M1,M2,M3,
  M2,M1,M1,
  M2,M2,M3,M1,
  M2,M3,M4,M3,M1,
  M2,M3,M4,M3,M2,
  M1,M2,D5,D0,
  M3,M3,M4,M5,
  M5,M4,M3,M4,M2,
  M1,M1,M2,M3,
  M2,M1,M1
};
float durt[]=       // list all tempo according to numbered musical notation
{
  1,1,1,1,
  1,1,1,1,
  1,1,1,1,
  1+0.5,0.5,1+1,
  1,1,1,1,
  1,1,1,1,
  1,1,1,1,
  1+0.5,0.5,1+1,
  1,1,1,1,
  1,0.5,0.5,1,1,
  1,0.5,0.5,1,1,
  1,1,1,1,
  1,1,1,1,
  1,1,1,0.5,0.5,
  1,1,1,1,
  1+0.5,0.5,1+1,
};
int length;
int tonepin=8;   // set module signal pin to D8 
void setup()
{
  pinMode(tonepin,OUTPUT);
  length=sizeof(tune)/sizeof(tune[0]);   // calculate length
}
void loop()
{
  for(int x=0;x<length;x++)
  {
    tone(tonepin,tune[x]);
    delay(500*durt[x]);   // this is use to adjust tempo delay, you can change the number to your liking.
    noTone(tonepin);
  }
  delay(2000);
}


Projeto 7: Medição de temperatura
double Thermister(int RawADC) 
{
double Temp;
Temp = log(((10240000/RawADC) - 10000));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
Temp = Temp - 273.15; // Convert Kelvin to Celcius
return Temp;
}
void setup()
{
Serial.begin(9600);
} 
void loop() 
{
Serial.print(Thermister(analogRead(1))); // display Fahrenheit 
Serial.println(" c");
delay(500);
}


Projeto 8: Faça uma lâmpada com controle de som
int ledpin=11;// set LED to D11
int soundpin=0;// set sensor to A0
void setup()
{
 Serial.begin(9600); // open serial port, set the baud rate at 9600 bps
 pinMode(ledpin,OUTPUT);// set LED pin as output
}
void loop()
{
 int val;
 val=analogRead(soundpin);   // read the value of sensor pin and assign it to val 
 Serial.println(val);
 if (val>170) 
  {            
  digitalWrite(ledpin, HIGH);  // turn LED ON
  } 
 else
  {
   digitalWrite(ledpin, LOW); // turn LED OFF
  }   
  delay(100);
}


Projeto 9: Faça uma lâmpada controlada por luz
int photopin=0;// set photocell sensor to A0
int ledpin=11;// set pin11 LED as PWM output to adjust the LED brightness
int val=0;// define variable val
void setup()
{
pinMode(ledpin,OUTPUT);// set digital pin 11 as output
Serial.begin(9600);// set baud rate to 9600
}
void loop()
{
val=analogRead(photopin);// read the analog value of the sensor and assign it to val
Serial.println(val);// display val value
analogWrite(ledpin,val/4);// turn on LED and set to maximum brightness(PWM output is 255)
delay(10);// wait 0.01S
}


Projeto 10: Alarme de nível de água
int analogPin = 1; // connect water sensor to analog interface 1
int buzzPin= 11; // buzzer to digital interface 11
int val = 0; // define the initial value of variable ‘val’ as 0
int data = 0; // define the initial value of variable ‘data’ as 0
void setup()
{
pinMode(buzzPin, OUTPUT); // define buzzer as output pin
Serial.begin(9600); // set baud rate at 9600
}
void loop()
{
val = analogRead(analogPin); // read and assign analog value to variable ’val’
if(val>400)
{ // decide whether variable ‘val’ is over 400 
digitalWrite(buzzPin,HIGH); // turn on buzzer when variable ‘val’ is over 400
}
else{
digitalWrite(buzzPin,LOW); // turn off buzzer when variable ‘val’ is under 400
}
data = val; // variable ’val’ assigns value to variable ‘data’
Serial.println(data); // print variable ‘data’ by Serial.print
delay(100);
}


Projeto 11:”Estou com sede”
int analogPin = 1; // connect soil humidity sensor to analog interface 1
int buzzer= 11; // buzzer to digital interface 11
int val ;
void setup()
{
pinMode(buzzer, OUTPUT); // define buzzer as output pin
Serial.begin(9600); // set baud rate at 9600
}
void loop()
{
val = analogRead(analogPin); // read and assign analog value to variable ’val’
Serial.print(val); // print variable ‘val’ by Serial.print
if(val<=300) {  { digitalWrite(buzzer,HIGH);  } Serial.println("  dry soil"); delay(50); } if((val>300)&&(val<500)) {  { digitalWrite(buzzer,LOW);  } Serial.println("  humid soil"); delay(50); } if(val>=500)
{ 
{
digitalWrite(buzzer,HIGH); 
}
Serial.println("  in water");
delay(50);
}
delay(100);
}


Projeto 12: Valor analógico visível
int rotatepin=0;// set rotation sensor to A0
int ledpin=11;// set pin11 LED as PWM output to adjust the LED brightness
int val=0;// define variable val
void setup()
{
pinMode(ledpin,OUTPUT);// set digital pin 11 as output
Serial.begin(9600);// set baud rate to 9600
}
void loop()
{
val=analogRead(rotatepin);// read the analog value of the sensor and assign it to val
Serial.println(val);// display val value
analogWrite(ledpin,val/4);// turn on LED and set to maximum brightness(PWM output is 255)
delay(10);// wait 0.01S
}


Projeto 13: Deteção de campo magnético
int rotatepin=0;// set rotation sensor to A0
int ledpin=11;// set pin11 LED as PWM output to adjust the LED brightness
int val=0;// define variable val
void setup()
{
pinMode(ledpin,OUTPUT);// set digital pin 11 as output
Serial.begin(9600);// set baud rate to 9600
}
void loop()
{
val=analogRead(rotatepin);// read the analog value of the sensor and assign it to val
Serial.println(val);// display val value
analogWrite(ledpin,val/4);// turn on LED and set to maximum brightness(PWM output is 255)
delay(10);// wait 0.01S
}


Projeto 14: Deteção de colisão
int ledpin=11;// set LED to D11
int inpin=9;// set sensor to D9
int val;// define variable val
void setup()
{
pinMode(ledpin,OUTPUT);// set pin LED as output
pinMode(inpin,INPUT);// set collision sensor as input
}
void loop()
{
val=digitalRead(inpin);// read value on pin 9 and assign it to val
if(val==HIGH)// check if the switch on the module if in closed state; if Yes, turn on LED
{ digitalWrite(ledpin,LOW);}
else
{ digitalWrite(ledpin,HIGH);}
}


Projeto 15: Lâmpada controlada por botão
int ledpin=11;// set LED to pin D11
int inpin=9;// set button to pin D9
int val;// define variable val
void setup()
{
pinMode(ledpin,OUTPUT);// set LED pin as “output”
pinMode(inpin,INPUT);// set button pin as “input”
}
void loop()
{
val=digitalRead(inpin);// read the level value of pin 9 and assign it to val
if(val==HIGH)// check if the button is pressed, if yes, turn on the LED
{ digitalWrite(ledpin,LOW);}
else
{ digitalWrite(ledpin,HIGH);}
}


Projeto 16: Sensor Touch Ligação Easy
int buzzPin =  11;    //Connect Buzzer to Digital Pin11
int inputPin = 9;     // Connect Touch sensor to Digital Pin 9
void setup() {
 pinMode(buzzPin, OUTPUT);      // declare buzzer as output
 pinMode(inputPin, INPUT);     // declare Touch sensor as input
}
void loop(){
 int val = digitalRead(inputPin);  // read input value
 if (val == HIGH) {            // check if the input is HIGH
   digitalWrite(buzzPin, HIGH);  // turn buzzer ON
 } else {
   digitalWrite(buzzPin, LOW); // turn buzzer OFF
}
}


Projeto 17:  Sensor Knock Ligação Easy
int Led=11;//define LED interface
int knock=9；//define knock sensor interface;
int val;//define digital variable val
void setup()
{
pinMode(Led,OUTPUT);//define LED pin to be output
pinMode(knock,INPUT);//define knock sensor pin to be input
}
void loop()
{
val=digitalRead(knock);// read the value of interface9 and assign it to val
if(val==HIGH)// when the knock sensor detect a signal, LED will turn on
{
digitalWrite(Led,LOW);
}
else
{
digitalWrite(Led,HIGH);
}
}


Projeto 18: Sensor de Inclinação Digital Ligação Easy
int ledPin = 11;                // Connect LED to pin 11
int tilt = 9;                 // Connect Tilt sensor to Pin9
void setup()
{
 pinMode(ledPin, OUTPUT);      // Set digital pin 11 as output
 pinMode(tilt, INPUT);       // Set digital pin 9 as input
}
void loop()
{
   
  if(digitalRead(tilt)==HIGH) //Read sensor value
    {
       digitalWrite(ledPin, HIGH);   // Turn on LED when the sensor is triggered
    }
  else
    {
       digitalWrite(ledPin, LOW);    // Turn off LED when the sensor is not triggered
    }
}


Projeto 19: Alarme de Incêndio
const int flamePin = 3;     // the number of the flame pin
const int buzzPin = 11;      // the number of the buzzer pin
// variables will change:
int State = 0;         // variable for reading status
void setup() {
 // initialize the buzzer pin as an output:
 pinMode(buzzPin, OUTPUT);      
 // initialize the flame pin as an input:
 pinMode(flamePin, INPUT);    
}
void loop(){
 // read the state of the value:
State = digitalRead(flamePin);
 if (State == HIGH) {    
   // turn buzzer on:    
   digitalWrite(buzzPin, HIGH);  
 }
 else {
   // turn buzzer off:
   digitalWrite(buzzPin, LOW);
 }
}


Projeto 20: Alarme de vibração
#define buzzPin     11
#define SensorINPUT   3 //Connect the sensor to digital Pin 3 which is Interrupt 1.
unsigned char state = 0;
void setup()
{
 pinMode(buzzPin, OUTPUT);
 pinMode(SensorINPUT, INPUT);
 attachInterrupt(1, blink, FALLING);// Trigger the blink function when the falling edge is detected
 }
void loop()
{  if(state!=0)
     {
       state = 0;
       digitalWrite(buzzPin,HIGH);
       delay(500);
     }  
     else
       digitalWrite(buzzPin,LOW);
}
void blink()//Interrupts function
{  state++;
}


Projeto 21: Detector de campo magnético
int buzzPin = 11;    // Connect Buzzer on Digital Pin11
int reedpin= 3; // define reed switch sensor interface
int val;// define digital variable val
void setup()
{
pinMode(buzzPin,OUTPUT);// define buzzer as output interface
pinMode(buttonpin,INPUT);// define reed switch sensor as output interface
}
void loop()
{
val=digitalRead(reedpin);// read and assign the value of digital interface 3 to val if(val==HIGH)// When a signal is detected by reed switch sensor,Buzzer will on
{
digitalWrite(buzzPin,LOW);
}
else
{
digitalWrite(buzzPin,HIGH);
}
}


Projeto 22: Alarme da temperatura
int buzzPin = 10; 
int ledpin= 11;
void setup()
{
   Serial.begin(9600);// Set Baud Rate to 9600 bps
   pinMode(ledpin,OUTPUT);// define LED as output 
   pinMode(buzzPin,OUTPUT);// define buzzer as output 
}
void loop()
{  int val;
   int dat;
   val=analogRead(0);// Connect LM35 on Analog 0
   dat=(500 * val) /1024;
   Serial.print("Temp:"); // Display the temperature on Serial monitor
   Serial.print(dat);
   Serial.println("C");
    if (dat>25) // when temperature is higher than 25℃, LED will be turned on, and buzzer will ring
  {            
  digitalWrite(buzzPin, HIGH);  // turn buzzer ON
  digitalWrite(ledpin, HIGH);  // turn LED ON
  } 
 else
  {
   digitalWrite(buzzPin, LOW);  // turn buzzer OFF
   digitalWrite(ledpin, LOW); // turn LED OFF
  }   
   delay(500);
}