Added wk3 demo codes

lab3/lab3_demo_lcd/lab3_demo_lcd.ino

+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+
+const uint16_t tickDelay = 1000;
+uint32_t tickCount = 0;
+
+void setup() {
+  // Initsialiseerime LCD
+  lcd.init();
+
+  // Lülitame LCD taustavalguse sisse
+  lcd.backlight();
+
+  // Kirjutame teksti LCDle, vaikimisi esimese rea algusse kui asukohta ei täpsusta
+  lcd.print("Korduste arv:");
+
+  // Kirjtuame teise rea positsioonidele 15 ja 16 naerunäo
+  lcd.setCursor(14, 1);
+  lcd.print(":)");
+}
+
+void loop() {
+  // Kirjutame teise rea algusse korduste arv
+  lcd.setCursor(0, 1);
+  lcd.print(tickCount);
+  lcd.print(" korda");
+
+  tickCount++;
+  delay(tickDelay);
+}

lab3/lab3_demo_light_dependent_resistor/lab3_demo_light_dependent_resistor.ino

+/* Fototakisti viigu number */
+#define LDR_PIN                        A0
+
+/* Arduino ADC on 10-bitine - st 2^10 = 1024 */
+#define ADC_RESOLUTION               1024
+
+/* Kasuta enda Arduino võrdluspinget */
+#define REF_VOLTAGE                  9.00 
+
+const int tickDelay = 500;
+
+void setup()
+{
+  Serial.begin(9600);
+  pinMode(LDR_PIN, INPUT);
+}
+
+void loop()
+{
+  int ldrReading = analogRead(LDR_PIN);
+  float ldrVoltage = (ldrReading / (float)ADC_RESOLUTION) * REF_VOLTAGE;
+  
+  Serial.print("Valgustakisti väärtus: ");
+  Serial.print(ldrReading);
+  Serial.print("; Mõõdetud pinge: ");
+  Serial.println(ldrVoltage);
+  
+  delay(tickDelay);
+}
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lab3/lab3_demo_scheduler/lab3_demo_scheduler.ino

+#define TICK_LIMIT     6
+
+uint16_t tickDelay = 166;
+uint8_t tickCount =    0;
+
+void setup() 
+{
+  Serial.begin(9600);
+}
+
+void loop() 
+{
+  /* Ülesannet lahendatakse 2 korda sekundis */
+  if (tickCount % 3 == 0)
+  {
+    Serial.print(millis() / (float)1000);
+    Serial.println(" Olen Boe-Bot");
+  }
+
+  /* Ülesannet lahendatakse 3 korda sekundis */
+  if (tickCount % 2 == 0)
+  {
+    Serial.print(millis() / (float)1000);
+    Serial.println(" Beep-Boop");
+  }
+
+  tickCount++;
+  /* Väldime loenduril tekkivat täisarvu ületäitumist! */
+  if (tickCount == TICK_LIMIT)
+  {
+    tickCount = 0;
+  }
+
+  delay(tickDelay);
+}
\ No newline at end of file

lab3/lab3_demo_thermistor/lab3_demo_thermistor.ino

+#define THERMISTOR_PIN                A0
+
+/* Arduino ADC on 10-bitine - st 2^10 = 1024 */
+#define ADC_RESOLUTION               1024
+
+/* Kasuta enda Arduino võrdluspinget */
+#define REF_VOLTAGE                  9.00 
+
+const uint16_t tickDelay = 500;
+
+void setup() 
+{
+  Serial.begin(9600);
+  pinMode(THERMISTOR_PIN, INPUT);
+}
+
+void loop() 
+{
+  uint16_t tempSensor = analogRead(THERMISTOR_PIN);
+  float tempInC = ((tempSensor / (float)ADC_RESOLUTION) * REF_VOLTAGE - 0.5) * 100;
+  
+  Serial.print("Temperatuur: ");
+  Serial.print(tempInC);
+  Serial.println("°C");
+  
+  delay(tickDelay);
+}
\ No newline at end of file

lab3/lab3_demo_time_passed/lab3_demo_time_passed.ino

+#define MSEC_IN_SEC  1000
+
+const int tickDelay = 250;
+
+void setup()
+{
+  Serial.begin(9600);
+}
+
+void loop()
+{
+  uint32_t timeInMs = millis();
+  uint8_t timeSecPassed = timeInMs / MSEC_IN_SEC;
+  uint16_t timeMsPassed = timeInMs % MSEC_IN_SEC;
+  
+  Serial.print("Aega möödunud: ");
+  Serial.print(timeSecPassed);
+  Serial.print("s ");
+  Serial.print(timeMsPassed);
+  Serial.println("ms");
+  
+  delay(tickDelay);
+}
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