39. Project: Button Buzzer LED

This lesson uses: Arduino UNO R3 board, TinkerBlock TK04 Push Button module, TinkerBlock TK36 Active Buzzer (or TK37), TinkerBlock TK01 XL LED (or TK02), jumper wires (or breadboard). Project: one button controls LED and buzzer; outcome: press = LED on and buzzer on, release = LED off and buzzer off.

1. Project goal

Build a button control system:

• Press: LED on, buzzer on
• Release: LED off, buzzer off

2. Wiring

• TK04 Button: VCC → 5V, GND → GND, SIGNAL → D2
• TK36 Active Buzzer: VCC → 5V, GND → GND, SIGNAL → D3
• TK01 LED: GND → GND, SIGNAL → D13

3. Program structure

Same as last lesson: two fixed blocks setup() and loop().

• setup(): Tell the board “D2 = button, D3 = buzzer, D13 = LED”; runs once.
• loop(): Keep repeating “read button → if pressed then LED on + buzzer on, else LED off + buzzer off → wait → repeat”.

One button drives both outputs: press = both on, release = both off.

4. Code to write

Type the code below into setup() and loop() (do not copy-paste; typing it yourself helps you remember):

#define BUTTON_PIN 2   // Button on D2
#define BUZZER_PIN 3   // Buzzer on D3
#define LED_PIN 13     // LED on D13

void setup() {
  pinMode(BUTTON_PIN, INPUT);   // D2 read button
  pinMode(BUZZER_PIN, OUTPUT);  // D3 buzzer
  pinMode(LED_PIN, OUTPUT);     // D13 LED
}

void loop() {
  int state = digitalRead(BUTTON_PIN);   // Pressed=HIGH, released=LOW
  if (state == HIGH) {
    digitalWrite(LED_PIN, HIGH);      // Pressed: LED on
    digitalWrite(BUZZER_PIN, HIGH);   // Pressed: buzzer on
  } else {
    digitalWrite(LED_PIN, LOW);       // Released: LED off
    digitalWrite(BUZZER_PIN, LOW);    // Released: buzzer off
  }
  delay(100);   // Debounce
}

Program notes

Overall idea: Read button; in the same if (state == HIGH) set both LED and buzzer HIGH, in else both LOW—press = both on, release = both off. Review digital input and multiple digital outputs.

5. Hands-on

1. After entering the code, click Verify (✓) to compile
2. Click Upload (→) to upload to the board
3. Test:
   • Press: LED on, buzzer on
   • Release: LED off, buzzer off
4. Try yourself:
   • Use passive buzzer (TK37) and tone() for a melody
   • Use RGB LED (TK02) for different colors

Expected result: When you press the button, LED and buzzer turn on.

Proceed to Lesson 40.

Edit this page — content/guides/tinkerblock-workshop/39-project-button-buzzer-led.mdx