Week 12 : Assignment

In week 12 assignment was to add an output device in microcontroller and I have to program it to do something ! I thought it will be a good idea to use the input devices I used in week 11.

All Details of 328p board is uploaded in week 11.

Humidity sensor with OLED

I already used the humidity sensor and print details on serial Monitor, I wanted to print them on my OLED now.

OLED (Organic Light-Emitting Diode) is a self light-emitting technology composed of a thin, multi-layered organic film placed between an anode and cathode. In contrast to LCD technology, OLED does not require a backlight. OLED possesses high application potential for virtually all types of displays and is regarded as the ultimate technology for the next generation of flat-panel displays. my reference for this code. Click here to know more.

setup

in setup, I connected

Humidity sensor with the Digital pin 4

Oled display to i2c communication

Code

I got these codes from Random Tutorials and About OLED and DHT sensor. I still needed to understand this code, I wrote in every comment what each line is doing, the way I understand...The below code will show Humidity and temperature.

Don’t forget to include

  /*
  * Random Nerd Tutorials - Rui Santos
  * Complete Project Details https://randomnerdtutorials.com
  */
  // require libraries one will need to run the code

  #include <Wire.h> // wire library for I2C communication

  // Adafruit library for the OLED printing
  #include <Adafruit_GFX.h>
  #include <Adafruit_SSD1306.h>

  #include <DHT.h>// library for Dht sensor

  #define DHTPIN 2 // digital pin is defined to humidity sensor
  #define DHTTYPE DHT11 // defined reading
  #define OLED_RESET 4 // OLED HAS TO DEFINE RESET IN EVEN IT IS NOT IN PINOUT
  Adafruit_SSD1306 display(OLED_RESET); //FOR DISPLAY

  // Initialize DHT sensor
  DHT dht(DHTPIN, DHTTYPE);

  void setup() {
  Wire.begin();
  dht.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);// initialize with the I2C addr 0x3C
  }

  void displayTempHumid(){
  delay(2000);
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {

    // if sensor failed to received any of three data it will fullfill this condition, if readings are available it will skip this loop

    display.clearDisplay(); // clearing the display
    display.setTextColor(WHITE); //setting the color
    display.setTextSize(1); //set the font size
    display.setCursor(5,0); //set the cursor coordinates
    display.print("Failed to read from DHT sensor!");
    return; // it will return to start if condition fulfilled
  }


  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0,10);

  // prints on display from below

  display.print("Humidity: ");
  display.print(h);
  display.print(" %\t");
  display.setCursor(0,20);
  display.print("Temperature: ");
  display.print(t);
  display.print(" C");

  // you can get tempreture values from below in fahrenheit

  //  display.setCursor(0,20);
  //  display.print("Temperature: ");
  //  display.print(f);
  //  display.print(" F");
  }
  void loop() {
  displayTempHumid();
  display.display();
  }
      

Output

Below I am trying to increase the humidity with a wet Handkerchief, see Below in video!

Servo motor with the Joystick

Then I tried to run Micro-servo with joystick module!

Setup

Joystick connected to (A1,A0) // Vrx, Vry

servo pin 6

Code

II explained code in the comments, I thought it would be a more efficient way, for simplicity copy code in Arduino and read, it will be more clear there.

Don’t forget to add a library of servo below.

      
  #include <Servo.h>

  // including servo library

  Servo servo1;
  // define servo name

  // initialize variables and define pins
  int x_pos;
  int y_pos;

  // Define pin for servo, define PWM pins
  int servo1_pin = 6;
  int initial_position = 90; // defined initial position, wanted to rotate both side

  // set initial numbers
  int xPosition = 0;
  int yPosition = 0;
  int SW_state = 0;
  int mapX = 0;
  int mapY = 0;
  int VRx = A1;
  int VRy = A0;
  int SW = 8;

  void setup ( ) {
    Serial.begin (9600); // defining the input and output pins
    servo1.attach (servo1_pin );
    servo1.write (initial_position);;
    pinMode(VRx, INPUT);
    pinMode(VRy, INPUT);
    pinMode(SW, INPUT_PULLUP);
  }

  void loop ( ) {
    // cod is reading joystick x and y axis readings
    xPosition = analogRead(VRx);
    yPosition = analogRead(VRy);
    SW_state = digitalRead(SW);


    // printing on serial monitor
    Serial.print("X: ");
    Serial.print(mapX);
    Serial.print(" | Y: ");
    Serial.print(mapY);
    Serial.print(" | Button: ");
    Serial.println(SW_state);

    delay(100);

    x_pos = analogRead (xPosition);    // reading position for servo control

      // below code dividing the values in two segments, (0,300) and (700,1023).

      // first part, lets say it is for rotation servo anti-clockwise code

      /* Below if position comes below 300 */
      if (x_pos < 300){
      if (initial_position < 10) {
        } // first it will check it is below 10 or what, if it is it will do nothing and forward the loop
      else{

        /* else it will decrease the data by 10, and new servo position will be available, this position values
          will be added or decrease depends on the readings
        */

        initial_position = initial_position - 10;
            servo1.write ( initial_position );
            delay (120); }
        }

      // second segment if values are greater then the 700, it will run servo to rotate oposite side

      if (x_pos > 700){
      if (initial_position > 980)
      {
      }
      else{
            initial_position = initial_position + 10; // it will just increase the values
            servo1.write ( initial_position );
            delay (120);
          }
       }


   // same things for y

        if (y_pos < 300){
      if (initial_position < 10) {
        }
      else{ initial_position = initial_position - 10;
            servo1.write ( initial_position );
            delay (120); }
        }
      if (y_pos > 700){
      if (initial_position > 180)
      {
      }
      else{
            initial_position = initial_position + 10;
            servo1.write ( initial_position );
            delay (120);
          }
       }
  }
      

video

Group work

in group work, we have to measure the power consumption of any output component possible. we measured Power Consumption for a BLDC motor. In this group work, we don’t need to divide specific tasks! we did it together so.

Check group website for more information.

Conclusion

This week made input week complete, learned I could use an input device to get different types of outputs.