Microduino BLE

Bring cable-free communication to your next build with the Microduino BLE, a compact Bluetooth 4.0 Low Energy module designed for transparent serial transmission. Built around the TI CC2541 chip, it stacks directly onto any Microduino Core via the standard UPin-27 connector, so your creations can talk to smartphones and tablets in minutes.

Operating on the 2.4GHz ISM band, the module supports AT commands for changing the baud rate, device name, and pairing password, and it even offers iBeacon mode for location-based applications. A status LED shows the connection state at a glance: flashing means powered but not paired, while a solid light means it is ready to send data.

As the product photo shows, the board comes in a clean white finish with a prominent black IC at its center, surrounded by surface-mount resistors and capacitors, gold-plated castellated pads along the edges, and a distinctive zigzag antenna trace etched into the corner. All of this fits within a tiny 30.5 x 25.5 x 7.5 mm footprint.

• Bluetooth V4.0 Low Energy with GFSK modulation on the 2.4GHz band
• TI CC2541 chip, 3.3V supply, and just 50mA current draw
• Default serial port on D4 (RX) and D5 (TX)
• Stackable UPin-27 design works with all Microduino modules and the Arduino IDE
• Great for smart-home projects, wearables, beacons, and sensor networks

Small in size but big on capability, this little board keeps your project connected without the clutter of wires.