Extras · BotWorkshop

Where to plug in

Remove the DX-BT24 Bluetooth module. Use that same 4-pin header on the Arduino robot shield: 5V, GND, RX (D0), TX (D1). Unplug anything on TX/RX before Upload — those pins are USB serial.

5V

Power for modules that need + / V+ / 5V.

GND

Ground — connect module - / G / GND here.

RX (D0)

Second digital line if you need another signal. Same upload warning as TX.

TX (D1)

Main signal pin for class extras. Coding buzz blocks use D1.

Passive buzzer (coded in Extras)

Passive buzzer module. Only two wires: - to GND, S to TX. Leave + unconnected. Prefer Coding → Extras blocks; snippet below matches what Upload generates.

Passive buzzer to Arduino robot shield (- to GND, S to TX). Unplug before Upload.

Code (shield TX · D1)

#define BUZZER_PIN 1  // TX on shield header

void setup() {
  // tone() sets the pin mode
}

void loop() {
  tone(BUZZER_PIN, 880);   // A5
  delay(300);
  noTone(BUZZER_PIN);
  delay(200);
}

Other modules on the Bluetooth header

Same header: GND + optional 5V + signal on TX (D1) or RX (D0). Paste into a blank Arduino sketch to try — unplug before every Upload.

Seven-colour LED or laser

- to GND, S to TX (laser also needs + to 5V). Never point a laser at eyes.

#define SIG_PIN 1  // TX

void setup() {
  pinMode(SIG_PIN, OUTPUT);
}

void loop() {
  digitalWrite(SIG_PIN, HIGH);
  delay(500);
  digitalWrite(SIG_PIN, LOW);
  delay(500);
}

Tactile / reed / tilt / shock

- to GND, + to 5V, S to TX. Serial Monitor at 9600 — unplug the module to Upload, then plug back in to read.

#define SIG_PIN 1  // TX

void setup() {
  pinMode(SIG_PIN, INPUT);
  Serial.begin(9600);
}

void loop() {
  Serial.println(digitalRead(SIG_PIN) ? "HIGH" : "LOW");
  delay(200);
}

Active buzzer

- to GND, S to TX (same as LED blink). Passive buzzer prefers tone() — use Coding Extras.

#define SIG_PIN 1

void setup() {
  pinMode(SIG_PIN, OUTPUT);
}

void loop() {
  digitalWrite(SIG_PIN, HIGH);
  delay(200);
  digitalWrite(SIG_PIN, LOW);
  delay(800);
}

Analog modules (LDR, joystick, heartbeat, many “A0” sensors) need an Arduino analog pin. The Bluetooth header has no analog line — see P3/P4 below.

Shield ports P3 / P4 (later)

P3 and P4 are spare connectors on the turtle shield. Good candidates once we confirm which Arduino pins they map to: LDR or analog temperature (need an analog pin), extra tilt/button on a free digital pin, or a second LED. Blockly / Coding support for P3 and P4 is not ready yet — code and blocks will be added after the pin map is checked in class. Until then, prefer the Bluetooth header examples above.

// Placeholder — replace PIN_P3 / PIN_P4 after we map the silk labels
// #define PIN_P3  /* TBD */
// #define PIN_P4  /* TBD */
//
// Example idea later:
//   pinMode(PIN_P3, INPUT);
//   int light = analogRead(PIN_P4);  // only if that port is analog

Sensor kit manual

Module pin labels and examples for common sensor boards.

Open PDF