Add code snippets for Week 2

WK2/0_serialMonitor.ino

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+/*
+   ________  ___   ___  
+  / __/ __ \/ _ | / _ \ 
+ _\ \/ /_/ / __ |/ , _/ 
+/___/\____/_/ |_/_/|_| 
+Arduino Workshop Series
+Session 2                          
+> Serial Monitor output of a for loop index. 
+*/
+
+void setup() {
+  Serial.begin(9600); //Set baudrate as 9600 bits per second (bps)
+}
+
+void loop() {
+  for(int i = 0 ; i <= 10; ++i) {
+    Serial.print(i); 		//Print current index
+    Serial.print(“\t”);
+    Serial.println(i*i);	//Print i multiply i
+    delay(1000); // wait for 1 second
+  }
+}

WK2/1_ledFade.ino

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+/*
+   ________  ___   ___  
+  / __/ __ \/ _ | / _ \ 
+ _\ \/ /_/ / __ |/ , _/ 
+/___/\____/_/ |_/_/|_| 
+Arduino Workshop Series
+Session 2                          
+> Fading an LED. 
+*/
+
+int ledPin = 3;    // LED connected to digital pin 3
+
+void setup() {
+  pinMode(ledPin, OUTPUT); //Declare as output mode
+}
+
+void loop() {
+  // fade in from min to max in increments of 5 points:
+  for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) {
+    analogWrite(ledPin, fadeValue);  // sets the value (0 to 255)
+    delay(30); // wait for 30 milliseconds
+  }
+
+  // fade out from max to min in increments of 5 points:
+  for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) {
+    analogWrite(ledPin, fadeValue);
+    delay(30); // wait for 30 milliseconds
+  }
+}
+

WK2/1_readBtn.ino

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+/*
+   ________  ___   ___  
+  / __/ __ \/ _ | / _ \ 
+ _\ \/ /_/ / __ |/ , _/ 
+/___/\____/_/ |_/_/|_| 
+Arduino Workshop Series
+Session 2                          
+> Reading button input. 
+*/
+
+const int buttonPin = 5;     // the number of the pushbutton pin
+const int ledPin =  13;      // the number of the LED pin
+
+int buttonState = 0;         // variable for reading the pushbutton status
+
+void setup() {
+  pinMode(ledPin, OUTPUT);	// initialize the LED pin as an output
+  pinMode(buttonPin, INPUT);  // initialize the pushbutton pin as an input
+}
+
+void loop() {
+  buttonState = digitalRead(buttonPin);		// read the state of the pushbutton value
+  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
+  if (buttonState == HIGH) {
+    digitalWrite(ledPin, HIGH);	// turn LED on
+  } else {
+    digitalWrite(ledPin, LOW);	// turn LED off
+  }
+}

WK2/1_readBtnDebounce.ino

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+/*
+   ________  ___   ___  
+  / __/ __ \/ _ | / _ \ 
+ _\ \/ /_/ / __ |/ , _/ 
+/___/\____/_/ |_/_/|_| 
+Arduino Workshop Series
+Session 2                          
+> Reading button input, with debouncing. 
+*/
+
+const int buttonPin = 5;     // the number of the pushbutton pin
+const int ledPin =  13;      // the number of the LED pin
+
+int ledState = 0;         // the current state of the output pin
+int buttonState = 0;         // variable for reading the pushbutton status
+int lastButtonState = 0;   // the previous reading from the input pin
+
+unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
+unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers
+
+void setup() {
+  pinMode(ledPin, OUTPUT);	// initialize the LED pin as an output
+  pinMode(buttonPin, INPUT);  // initialize the pushbutton pin as an input
+}
+
+void loop() {
+  int reading = digitalRead(buttonPin);		// read the state of the pushbutton value
+
+  // If the switch changed, due to noise or pressing:
+  if (reading != lastButtonState) {
+    lastDebounceTime = millis(); // reset the debouncing timer
+  }
+
+   if ((millis() - lastDebounceTime) > debounceDelay) {
+    // whatever the reading is at, it's been there for longer than the debounce
+    // delay, so take it as the actual current state:
+
+    // if the button state has changed:
+    if (reading != buttonState) {
+      buttonState = reading;
+
+      // only toggle the LED if the new button state is HIGH
+      if (buttonState == HIGH) {
+        ledState = !ledState;
+      }
+    }
+  }
+}

WK2/2_readPot.ino

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+/*
+   ________  ___   ___  
+  / __/ __ \/ _ | / _ \ 
+ _\ \/ /_/ / __ |/ , _/ 
+/___/\____/_/ |_/_/|_| 
+Arduino Workshop Series
+Session 2                          
+> Reading value of potentiometer. 
+*/
+
+int potPin = A0;    // select the input pin for the potentiometer
+int ledPin = 13;   // select the pin for the LED
+int val = 0;       // variable to store the value coming from the sensor
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(ledPin, OUTPUT);  // declare the ledPin as an OUTPUT
+}
+
+void loop() {
+  val = analogRead(potPin);    // read the value from the sensor (0 <-> 1024)
+  Serial.println(val);         // Print potentiometer value
+  digitalWrite(ledPin, HIGH);  // turn the ledPin on
+  delay(val);                  // stop the program for some time
+  digitalWrite(ledPin, LOW);   // turn the ledPin off
+  delay(val);                  // stop the program for some time
+} 
+

WK2/3_ldr_intensity_template.ino

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+/*
+   ________  ___   ___  
+  / __/ __ \/ _ | / _ \ 
+ _\ \/ /_/ / __ |/ , _/ 
+/___/\____/_/ |_/_/|_| 
+Arduino Workshop Series
+Session 2                          
+> Light Intensity Display (Template). 
+*/
+
+//Pin setup
+const int LEDS[4] = {12,11,10,9};
+const int ldr_pin = A0;
+
+int lightIntensity = 0;		//LDR value, intensity of LDR
+void setup()
+{
+  Serial.begin(9600);	//Start serial
+  //Setup pins
+  for(int i=0;i<4;++i){
+      pinMode(LEDS[i], OUTPUT);
+  }
+  pinMode(ldr_pin, INPUT);
+}
+
+void loop()
+{
+   //Read LDR
+
+   //Process the LDR values
+
+   //Set the LEDs accordingly
+
+
+  //Print serial output
+  Serial.println(lightIntensity);
+}