Lesson 3 · Weeks 3–4

int buttonPin = 7;        // the pushbutton is on pin D7 of the ThinkerShield
int ledPin = 12;          // the LED is on pin D12
int buttonState = 0;      // variable for reading the pushbutton's state

void setup() {
  pinMode(ledPin, OUTPUT);     // the LED pin is an output
  pinMode(buttonPin, INPUT);   // the button pin is an input
}

void loop() {
  buttonState = digitalRead(buttonPin);   // read the button
  if (buttonState == HIGH) {              // is it pressed?
    digitalWrite(ledPin, HIGH);           // yes -> LED on
  } else {
    digitalWrite(ledPin, LOW);            // no  -> LED off
  }
}

int LED = 12;             // call pin 12 "LED" for the rest of this sketch

void setup() {
  pinMode(LED, OUTPUT);   // make the LED pin an output
}

void loop() {             // runs over and over again, forever
  digitalWrite(LED, HIGH);  // turn the LED on
  delay(1000);              // wait for one second
  digitalWrite(LED, LOW);   // turn the LED off
  delay(1000);              // wait for one second
}

int sensorPin = A5;       // the potentiometer (POT A5) on the ThinkerShield
int ledPin = 12;          // the LED on pin D12
int sensorValue = 0;      // variable to store the value from the sensor

void setup() {
  pinMode(ledPin, OUTPUT);  // the LED pin is an output
  Serial.begin(9600);       // start serial so we can print the sensor value
}

void loop() {
  sensorValue = analogRead(sensorPin);  // read the knob (0 to 1023)
  digitalWrite(ledPin, HIGH);           // LED on
  delay(sensorValue);                   // wait — bigger value, longer wait
  digitalWrite(ledPin, LOW);            // LED off
  delay(sensorValue);                   // wait again
  Serial.print("The sensor value is: ");
  Serial.println(sensorValue);          // print the value to the Serial Monitor
}

int buzzerPin = 3;        // the piezo buzzer is on pin D3 of the ThinkerShield

void setup() {
  pinMode(buzzerPin, OUTPUT);   // the buzzer pin is an output
}

void loop() {
  tone(buzzerPin, 600, 30);     // play a 600 Hz tone for 30 ms...
  delay(150);                   // ...then wait 150 ms before repeating
}

int lowTone = 400;
int highTone = 600;
const int ALARMSOUNDER = 3;     // the buzzer is on pin D3

void setup() {
  pinMode(ALARMSOUNDER, OUTPUT);
}

void loop() {
  tone(ALARMSOUNDER, lowTone, 500);   // low tone for half a second
  delay(500);
  tone(ALARMSOUNDER, highTone, 500);  // high tone for half a second
  delay(500);
}

int i = 200;
const int ALARMSOUNDER = 3;     // the buzzer is on pin D3

void setup() {
  pinMode(ALARMSOUNDER, OUTPUT);
}

void loop() {
  for (i = 200; i < 700; i = i + 2) {   // sweep from a low tone up to a high tone
    tone(ALARMSOUNDER, i, 10);          // play the tone, changing every 10 ms
    delay(10);
  }
  for (i = 701; i > 200; i = i - 2) {   // sweep back down
    tone(ALARMSOUNDER, i, 10);
    delay(10);
  }
}

int sensorPin = 7;    // the sensor (a switch on the box) connects to pin 7
int flashPin = 13;    // an LED that lights up when the alarm sounds
int buzzerPin = 3;    // the buzzer connects to pin 3
int Status = 0;       // 0 = exit delay, 1 = armed, 2 = triggered
int sensor = 0;       // the current sensor reading

void setup() {
  pinMode(sensorPin, INPUT);
  pinMode(flashPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  if (Status == 0) {            // first time through the loop — arm the alarm
    delay(3000);                // gives you 3 seconds to close the box
    tone(buzzerPin, 725, 40);   // a short beep...
    delay(200);
    tone(buzzerPin, 725, 40);   // ...and another, so it double-beeps when armed
    Status = 1;                 // armed — don't run this block again
  }
  if (Status == 1) {
    sensor = digitalRead(sensorPin);   // read the switch
  }
  if (sensor == 0) {            // the box has been opened
    Status = 2;
  }
  if (Status == 2) {            // triggered — flash the LED and sound the alarm
    digitalWrite(flashPin, HIGH);
    tone(buzzerPin, 725, 1000);
    delay(1000);
    tone(buzzerPin, 330, 1000);
    delay(1000);
  }
}