Added lab 2 demo codes

lab2/lab2_demo_btn_read/lab2_demo_btn_read.ino

+#define BTN_PIN 3
+
+const int tickDelay = 100;
+
+void setup() 
+{
+  // Alustame jadaühenduse
+  Serial.begin(9600);
+
+  // Määrame nupu sisendiks
+  pinMode(BTN_PIN, INPUT);
+}
+
+void loop() 
+{
+  // Loeme nupu oleku
+  bool btnState = digitalRead(BTN_PIN);
+
+  // Saadame nupu oleku üle jadaühenduse
+  Serial.print("btn:");
+  Serial.println(btnState);
+
+  delay(tickDelay);
+}
\ No newline at end of file

lab2/lab2_demo_const/lab2_demo_const.ino

+// Konstant tüüpi muutuja deklareerimine
+const int leftLedPin = 7;
+
+void setup() 
+{
+  // Seadistame parempoolse LEDi väljundiks
+  pinMode(leftLedPin, OUTPUT);
+}
+
+void loop() 
+{
+  // Lülitame LEDi sisse 500 ms
+  digitalWrite(leftLedPin, HIGH);
+  delay(500);
+
+  // Seejärel lülitame LEDi välja ning ootame veel 500 ms
+  digitalWrite(leftLedPin, LOW);
+  delay(500);
+}
\ No newline at end of file

lab2/lab2_demo_macro/lab2_demo_macro.ino

+// Makro defineerimine
+#define LED_LEFT_PIN 7
+
+void setup() 
+{
+  // Seadistame parempoolse LEDi väljundiks
+  pinMode(LED_LEFT_PIN, OUTPUT);
+}
+
+void loop() 
+{
+  // Lülitame LEDi sisse 500 ms
+  digitalWrite(LED_LEFT_PIN, HIGH);
+  delay(500);
+
+  // Seejärel lülitame LEDi välja ning ootame veel 500 ms
+  digitalWrite(LED_LEFT_PIN, LOW);
+  delay(500);
+}
\ No newline at end of file

lab2/lab2_demo_potentiometer/lab2_demo_potentiometer.ino

+// Potentsiomeeter kasutab analoogviiku
+#define POT_PIN        A2
+
+// Uuendus iga 200 ms tagant
+const int tickDelay = 200;
+
+void setup() 
+{
+  Serial.begin(9600);
+}
+
+void loop() 
+{
+  // Loeme potentsiomeetri väärtuse ja edastame üle jadaühenduse
+  int potVal = analogRead(POT_PIN);
+  Serial.println(potVal);
+  
+  delay(tickDelay);
+}
\ No newline at end of file

lab2/lab2_demo_pwm_fade/lab2_demo_pwm_fade.ino

+#define LED_PIN         3
+
+#define MIN_BRIGHTNESS  20
+#define MAX_BRIGHTNESS  90
+
+const int tickDelay = 20;
+
+int brightness = MIN_BRIGHTNESS;
+int brightnessShift = 1;
+
+void setup() 
+{
+  
+}
+
+void loop() 
+{
+  // Muudame eredust
+  brightness += brightnessShift;
+  
+  // Jõudes valgustugevuse piirideni, muudame ereduse muutumise suunda
+  if (brightness >= MAX_BRIGHTNESS || brightness <= MIN_BRIGHTNESS) {
+    brightnessShift = -brightnessShift;
+  }
+
+  // Kasutades PWMi, uuendame LEDi eredust
+  analogWrite(LED_PIN, brightness);
+
+  delay(tickDelay);
+}
\ No newline at end of file

lab2/lab2_demo_states_conditional_led/lab2_demo_states_conditional_led.ino

+#define LED_LEFT_PIN 7
+
+const int tickDelay = 500;
+
+bool ledState = true;
+
+void setup() 
+{
+  // Seadistame parempoolse LEDi väljundiks
+  pinMode(LED_LEFT_PIN, OUTPUT);
+}
+
+void loop() 
+{
+  // Anname LEDile uue oleku
+  digitalWrite(LED_LEFT_PIN, ledState);
+
+  // Kontrollime, kas siide ühest olekust teise on lubatud
+  if (btnState)
+  {
+    // Teostame siirde
+    ledState = !ledState;
+  }
+
+  delay(tickDelay);
+}
\ No newline at end of file

lab2/lab2_demo_states_led/lab2_demo_states_led.ino

+#define LED_LEFT_PIN 7
+
+const int tickDelay = 500;
+
+bool ledState = true;
+
+void setup() 
+{
+  // Seadistame parempoolse LEDi väljundiks
+  pinMode(LED_LEFT_PIN, OUTPUT);
+}
+
+void loop() 
+{
+  // Anname LEDile uue oleku
+  digitalWrite(LED_LEFT_PIN, ledState);
+
+  // Muudame LEDi olekut järgmiseks tsükliks
+  ledState = !ledState;
+
+  delay(tickDelay);
+}
\ No newline at end of file

lab2/lab2_demo_states_tristate_led/lab2_demo_states_tristate_led.ino

+// LEDi viigu defineerimine
+#define LED_PIN                3
+
+// Kodeeritud süsteemi olekud
+#define STATE_LED_OFF          0
+#define STATE_LED_HALF_POWER   1
+#define STATE_LED_FULL_POWER   2
+
+// PWM täitetegurid
+#define LED_PWN_OFF            0
+#define LED_PWM_HALF         127
+#define LED_PWM_FULL         255
+
+const int tickDelay = 500;
+int ledState = STATE_LED_OFF;
+int brightness = LED_PWN_OFF;
+
+void setup() 
+{
+  
+}
+
+void loop() 
+{
+  // Leiame oleku põhjal PWM signaali täiteteguri
+  switch (ledState)
+  {
+    case STATE_LED_OFF:
+      brightness = LED_PWN_OFF;
+      break;
+    case STATE_LED_HALF_POWER:
+      brightness = LED_PWM_HALF;
+      break;
+    case STATE_LED_FULL_POWER:
+      brightness = LED_PWM_FULL;
+      break;
+    default:
+      brightness = LED_PWN_OFF;
+  }
+
+  // Kasutades PWMi, uuendame LEDi eredust
+  analogWrite(LED_PIN, brightness);
+
+  // Siire järgmisse olekusse
+  ledState = (ledState + 1) % 3;
+
+  delay(tickDelay);
+}
\ No newline at end of file