Connect Arduino & IoT Devices with Bluetooth

Build IoT Apps Without Code

Codular supports full Bluetooth connectivity - connect to Arduino boards, sensors, printers, and any BLE device.

3 Bluetooth Components

Connecting to Arduino

Step 1: Setup Arduino

Upload a sketch that sends/receives serial data over Bluetooth (HC-05/HC-06 module).

Step 2: Add Components

• Drag BluetoothAdmin onto screen (to check/enable BT)
• Drag BluetoothClient onto screen
• Set Service UUID (default works for most serial modules)
• Drag Arduino component for serial communication
• Set Baud Rate to match your Arduino (usually 9600)

Step 3: Create Flows

• Scan: Event → Start Bluetooth Scan → save devices to variable
• Connect: Event (device selected) → Connect Bluetooth (deviceId)
• Send: Event (button press) → Send Bluetooth Data ("LED_ON")
• Receive: BluetoothClient.onDataReceived → Set Variable (sensorData)

Thermal Printer via Bluetooth

• Drag ThermalPrinter component
• Set connection = Bluetooth, paper width = 58mm
• Flow: Connect Thermal Printer → Print Receipt (text) → Print Barcode (QR) → Cut Paper

Tips

• Always check Bluetooth is enabled before scanning
• Handle disconnection gracefully
• Use the Arduino component's delimiter (\n) to split messages
• Test with HC-05 module first - most compatible

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