PJ020: Starting Experience of C++ with Arduino

/*

Task 1: Use Int variables for blinking LED

*/

// Pin for built-in LED, please assign right value

// 13 for Arduino UNO R3

// 25 for Arduino UNO WiFi Rev2

int led_pin = 13;

// Sleep time in ms

int sleep_ms = 500;

void setup() {

  // Set pin mode as OUTPUT for LED

  pinMode(led_pin, OUTPUT);

}

void loop() {

  // Turn on LED

  digitalWrite(led_pin, HIGH);

  delay(sleep_ms);

  // Turn off LED

  digitalWrite(led_pin, LOW);

  delay(sleep_ms);

}

/*

Task 2: Add Serial Communication Sending

*/

// Pin for built-in LED, please assign right value

// 13 for Arduino UNO R3

// 25 for Arduino UNO WiFi Rev2

int led_pin = 13;

// Sleep time in ms

int sleep_ms = 500;

void setup() {

  // Initialize serial communication with baud rate (speed)

  Serial.begin(9600);

  // Set pin mode as OUTPUT for LED

  pinMode(led_pin, OUTPUT);

}

void loop() {

  // Turn on LED, after printing a message

  Serial.print("Turning on...");

  digitalWrite(led_pin, HIGH);

  delay(sleep_ms);

  // Turn off LED, after printing a message

  Serial.println("Turning off");

  digitalWrite(led_pin, LOW);

  delay(sleep_ms);

}

/*

Task 3: Add Serial Communication Receiving, Make an Echo

*/

// A char variable to store received character

char received_char;

void setup() {

  // Initialize serial communication with baud rate (speed)

  Serial.begin(9600);

}

void loop() {

  // Check if serial buffer has received any chars

  if (Serial.available() > 0) {

    // Read in the char and store to variable

    received_char = Serial.read();

    // Echo a message back to the sender

    Serial.print("Arduino has received:");

    Serial.println(received_char);

  }

}

/*

Task 4: Use Received Char to On/off LED

Challanges:

Use 'H' or 'h' to turn on LED, use 'L' or 'l' to turn off LED.

Skip the useless line feeding char, don't handle it (a little about ASCII)

*/

// Pin for built-in LED, please assign right value

// 13 for Arduino UNO R3

// 25 for Arduino UNO WiFi Rev2

int led_pin = 13;

// A char variable to store received character

char received_char;

void setup() {

  // Initialize serial communication with baud rate (speed)

  Serial.begin(9600);

  // Set pin mode as OUTPUT for LED

  pinMode(led_pin, OUTPUT);

}

void loop() {

  // Check if serial buffer has received any chars

  if (Serial.available() > 0) {

    // Read in the char and store to variable

    received_char = Serial.read();

    if (received_char == 'H') {

      Serial.println("Turning on...");

      digitalWrite(led_pin, HIGH);

    }

    else if (received_char == 'L') {

      Serial.println("Turning off...");

      digitalWrite(led_pin, LOW);

    }

    else {

      Serial.print("Unknown command:");

      Serial.println(received_char);

    }

  }

}

/*

Task 5: Use Received String to On/off LED

Challenges:

Use "high"(ignore case) to turn on LED, use "low" (ignore case) to turn off LED

*/

// Pin for built-in LED, please assign right value

// 13 for Arduino UNO R3

// 25 for Arduino UNO WiFi Rev2

int led_pin = 13;

// A String variable to store received string

String received_string;

void setup() {

  // Initialize serial communication with baud rate (speed)

  Serial.begin(9600);

  // Set pin mode as OUTPUT for LED

  pinMode(led_pin, OUTPUT);

}

void loop() {

  if (Serial.available() > 0) {

    // Read the string ending with a line feeding char

    received_string = Serial.readString();

    // Trim the trailing "empty" char, i.e. '\n'

    received_string.trim();

    // Echo a message back to the sender

    Serial.print("Arduino has received:");

    Serial.println(received_string);

    if (received_string == "High") {

      Serial.println("Turning on...");

      digitalWrite(led_pin, HIGH);

    }

    else if (received_string == "Low") {

      Serial.println("Turning off...");

      digitalWrite(led_pin, LOW);

    }

    else {

      Serial.print("Unknown command:");

      Serial.println(received_string);

    }

  }

}