45. Final Project: Free Integration

This lesson uses: Arduino UNO R3 board, any modules from previous lessons, jumper wires (or breadboard). Final project: combine what you learned into one project; outcome: choose a theme (e.g. smart lamp, temp/humidity alarm, remote LED), finish wiring, code, and test—wrap up the course.

1. Project goal

Pick a theme and combine several modules into one project, for example:

• Smart home controller: button control, temp/humidity display, LED indicator
• Game controller: joystick, LED feedback, buzzer sound
• Environment station: multiple sensors, TFT display, data logging

2. Project ideas

Project 1: Smart lamp

• Modules: potentiometer (brightness), RGB LED, button (on/off)
• Features: potentiometer sets brightness, button switches color

Project 2: Temp/humidity alarm

• Modules: DHT11, buzzer, LED
• Features: alarm when temperature or humidity is out of range

Project 3: Remote LED

• Modules: IR receiver, RGB LED, button
• Features: remote controls LED color and brightness

3. Project steps

1. Choose a theme: Pick a project you like
2. Choose modules: Match modules to the functions you want
3. Design behavior: Plan the flow of the project
4. Write code: Use what you learned in earlier lessons
5. Test and debug: Test each part and fix issues
6. Improve: Add features and polish

Below is a “smart lamp” example: knob for brightness, button for color; type it in and then change it to your own idea.

4. Code example (smart lamp)

// Example: Smart lamp — potentiometer for brightness, button to change color (white/red/green/blue)
#define POT_PIN A0
#define RED_PIN 3
#define GREEN_PIN 5
#define BLUE_PIN 6
#define BUTTON_PIN 2

int brightness = 128;
int colorMode = 0;  // 0=white, 1=red, 2=green, 3=blue

void setup() {
  pinMode(RED_PIN, OUTPUT);     // RGB PWM
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);   // Button to change color
}

void loop() {
  // Read potentiometer for brightness
  int potVal = analogRead(POT_PIN);
  brightness = map(potVal, 0, 1023, 0, 255);
  
  // Button: change color
  if (digitalRead(BUTTON_PIN) == LOW) {
    colorMode = (colorMode + 1) % 4;
    delay(200);
  }
  
  // Set RGB by color mode
  switch (colorMode) {
    case 0:  // White
      analogWrite(RED_PIN, brightness);
      analogWrite(GREEN_PIN, brightness);
      analogWrite(BLUE_PIN, brightness);
      break;
    case 1:  // Red
      analogWrite(RED_PIN, brightness);
      analogWrite(GREEN_PIN, 0);
      analogWrite(BLUE_PIN, 0);
      break;
    case 2:  // Green
      analogWrite(RED_PIN, 0);
      analogWrite(GREEN_PIN, brightness);
      analogWrite(BLUE_PIN, 0);
      break;
    case 3:  // Blue
      analogWrite(RED_PIN, 0);
      analogWrite(GREEN_PIN, 0);
      analogWrite(BLUE_PIN, brightness);
      break;
  }
  
  delay(50);
}

Program notes

Overall idea: Example is a “smart lamp”: potentiometer maps to brightness for PWM; button cycles colorMode (0–3); switch (colorMode) sets RGB for white/red/green/blue. Uses analog input, digital input, PWM, map, edge detection, and switch.

About the switch statement

The example uses switch to run different code depending on colorMode: switch (colorMode) means “check the value of colorMode”; case 0:, case 1: etc. run when the value is 0, 1, …; break; exits the switch (without it execution falls through to the next case). This is clearer than many if (colorMode == 0) ... else if (colorMode == 1) ....

5. Hands-on

1. Choose a theme: Based on your interest
2. Design behavior: Plan what the project should do
3. Write code: Use skills from earlier lessons
4. Test: Test each part step by step
5. Improve: Add features and refine the project

Project outcome:

A complete Arduino project that does what you designed.

6. Summary

With this final project you have:

• Learned basic Arduino programming
• Used many sensors and modules
• Combined modules into full projects
• Gained the ability to build your own Arduino projects

Congratulations on finishing the TinkerBlock Arduino Beginner Workshop!

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