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Romeo BLE Quad is an Arduino compatible robot controller based on STM32 ARM chip. It inherits all features from the Bluno M3, including wireless programming support, wireless communication between iOS/Android apps and remote control. Beyond this it also includes a 4-way DC motor driver and encoder interfaces. You can implement a robot with PID closed-loop feedback control directly with our TT Geared Motor.

As well as this the Romeo BLE Quad offers powerful performance thanks to the STM32 ARM 32-bit microcontroller with more storage space and more interface resources. DFRobot has developed bespoke firmware to make it compatible with Arduino IDE and accessible to beginners to robotics.

The board includes 10 digital and 5 analog I/O pins that are independent of the motor driver pins. The board also includes a series of “Gravity”interface pins that are marked with different colors to easily differentiate analog and digital I/O pins as well as including extra power and ground connections for devices. The Gravity interface is colored as follows:

  • Red indicates power
  • Black indicates ground
  • Blue indicates Analog Input Pin
  • Green indicates Digital I/O Pin

The Gravity interface is directly compatible with DFRobot Gravity sensors and modules. An external servo barrel jack connector supplies power for higher power devices. If you want to build your own robot, this is probably the best robot controller board available!

Note: The Operating voltage of Romeo BLE Quad is 3.3V, please read the wiki Board Overview carefully before usage!


  • Supports Arduino IDE/Arduino C
  • Supports Bluetooth Wireless Communications/Programming
  • Supports Android and iOS applications, open source code, suitable for secondary development by the user
  • Supports AT commands to configure BLE
  • Upgradable firmware
  • 4WD Support


  • Microcontroller: STM32 F103RET6
  • Clock Speed: 72 MHZ
  • Bluetooth Chip: TI CC2540 (Bluetooth 4.0)
  • Communication Range: 30m
  • Operating Voltage: 3.3V
  • DC Supply: USB Powered or External 7V~10V DC
  • DC Motor: 4 way
  • Supports USB and external power supply automatic switching
  • Digital I/O Pins: 10
  • Analog I/O Pins: 5
  • I2C/IWC: 30 (Default SDA), 29 (Default SCL)
  • SRAM: 64k
  • Flash: 512K (Customizable Flash assignment, refer to Flash chapter for more info): Default User Code repository: 492K, Default User Data repository: 20KA
  • Serial Port: 2 (Serial1, Serial3): Serial1 0 (Rx1) and 1 (Tx1) ; Serial3 30 (Rx3), and 29 (Tx3)
  • Size: 67 x 42 (mm)
  • Weight: 54g

Parts List

  • Romeo BLE Quad - A STM32 Robot Control Board x1
  • JST PH2.0-4Pin encoder wire x4
  • JST PH2.0-2Pin motor wire x4
  • PH2.0-2Pin to XH2.54-2Pin power wire x2

Romeo BLE Quad - A STM32 Robot Control Board with Quad DC Motor Driver + Bluetooth 4.0

  • Brand: DFRobot
  • Product Code: DFR-DFR0398
  • Reward Points: 42
  • Availability: 1
  • £51.54

  • Ex Tax: £42.95
  • Price in reward points: 500

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