Bluetooth Module Control

Z2M Part: EMC-00004-A

Control Arduino via Bluetooth using HC-05 or similar module.

Circuit Diagram

Wire Connections & Pin Configuration

Wire Color Connections:

Green → Pin 0 (RX) to Bluetooth TX
Blue → Pin 1 (TX) to Bluetooth RX
Red → 5V to Bluetooth VCC
Black → GND to Bluetooth GND, LED cathode
Yellow → Pin 13 to LED anode

Pin Configuration:

Arduino Digital Pin 0 (RX) → Bluetooth TX
Arduino Digital Pin 1 (TX) → Bluetooth RX (via voltage divider)
Arduino 5V → Bluetooth VCC
Arduino GND → Bluetooth GND
Arduino Digital Pin 13 → LED anode
Arduino GND → LED cathode

Arduino Code

Edit

char data = 0; // Variable to store received data

void setup() {
  Serial.begin(9600);     // Initialize serial communication
  pinMode(13, OUTPUT);    // Set LED pin as output
}

void loop() {
  // Check if data is received via Bluetooth
  if (Serial.available() > 0) {
    data = Serial.read();   // Read incoming data
    Serial.println(data);   // Print received data to Serial Monitor

    // Control LED based on received command
    if (data == 'F') {
      digitalWrite(13, HIGH);  // Turn LED ON
    }
    else if (data == 'B') {
      digitalWrite(13, LOW);   // Turn LED OFF
    }
  }
}

Instruction Details

Wiring: Connect Bluetooth TX to Arduino RX (Pin 0), RX to Arduino TX (Pin 1) via voltage divider (1kΩ). Connect VCC to 5V, GND to GND. Connect LED anode to Pin 13 via 220Ω, cathode to GND.
Library: Not required (built-in).
Upload Code: Tools → Board → Arduino Uno. Tools → Port → select your COM port. Click Upload button.
View Output: Pair with phone/PC via Bluetooth. Use serial app to send 'F' (LED ON) or 'B' (LED OFF).

How to Use

Connect the required components as per the Pin Configuration above
Open Arduino IDE and create a new sketch
Copy and paste the code above
Select your Arduino board and COM port from Tools menu
Click the Upload button to upload the code to your Arduino
Open Serial Monitor (if applicable) to see the output

Components Required

Arduino Uno
HC-05 or HC-06 Bluetooth Module
LED
220Ω Resistor
Breadboard
Jumper Wires

Category: Communication