42. Project: Joystick Control

This lesson uses: Arduino UNO R3 board, TinkerBlock TK94 Five-Direction Joystick module, TinkerBlock TK01 XL LED, TK37 Passive Buzzer (optional), jumper wires (or breadboard). Project: joystick direction and button control LED and buzzer; outcome: up = LED on, down = LED off, left = low tone, right = high tone, press = buzzer off; serial prints current action.

1. Project goal

Build a joystick control system:

• Up: LED on (or play high note)
• Down: LED off (or play low note)
• Left/Right: RGB LED different colors
• Press: buzzer on

2. Wiring

• TK94 Five-Direction Joystick: VCC → 5V, GND → GND, SIGNAL → A0
• TK01 LED: GND → GND, SIGNAL → D13
• TK37 Passive Buzzer: GND → GND, VCC → 5V, SIGNAL → D3

3. Program structure

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

• setup(): Init pins, start serial; runs once.
• loop(): Keep repeating “read joystick → decide direction → set output → wait → repeat”.

Up = LED on, down = LED off, left = low tone, right = high tone, press = buzzer off—one joystick does it all.

4. Code to write

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

// Joystick: up/down = LED, left/right = pitch, press = stop buzzer
#define JOYSTICK_PIN A0
#define LED_PIN 13
#define BUZZER_PIN 3

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(9600);
  Serial.println("Joystick control started");
}

void loop() {
  int val = analogRead(JOYSTICK_PIN);   // Different ranges = direction
  if (val >= 100 && val <= 130) {
    // Up: LED on
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Up - LED on");
  } else if (val >= 450 && val <= 470) {
    // Down: LED off
    digitalWrite(LED_PIN, LOW);
    Serial.println("Down - LED off");
  } else if (val >= 270 && val <= 290) {
    // Left: low tone
    tone(BUZZER_PIN, 262);
    Serial.println("Left - low");
  } else if (val >= 1000 && val <= 1024) {
    // Right: high tone
    tone(BUZZER_PIN, 523);
    Serial.println("Right - high");
  } else if (val >= 180 && val <= 190) {
    // Press: stop buzzer
    noTone(BUZZER_PIN);
    Serial.println("Press - stop");
  } else {
    noTone(BUZZER_PIN);   // Center/other: stop buzzer
  }
  delay(200);   // Poll interval
}

Program notes

Overall idea: Same as L34: read joystick on A0 and use value ranges for direction. Here: up/down control LED, left/right use tone for different pitch, press and center call noTone. Calibrate ranges to your module.

5. Hands-on

1. After entering the code, click Verify (✓) to compile
2. Click Upload (→) to upload to the board
3. Use the joystick:
   • Up: LED on
   • Down: LED off
   • Left: buzzer low tone
   • Right: buzzer high tone
   • Press: buzzer off
4. Try yourself: add RGB LED colors for directions

Expected result:

Serial monitor:

Joystick control started
Up - LED on
Down - LED off
Left - low
Right - high
Press - stop
...

LED and buzzer respond to joystick.

Proceed to Lesson 43.

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