Little Bird
Full Feature THETA Robot for BBC micro:bit
The THETA Robot is a feature-packed, circular robot platform designed for BBC micro:bit. Developed in conjunction with ROBOTIXLAB in Greece, it arrives ready...
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The THETA Robot is a feature-packed, circular robot platform designed for BBC micro:bit. Developed in conjunction with ROBOTIXLAB in Greece, it arrives ready-assembled with multiple sensors, dual motors, and extensive expansion capability.
A dedicated onboard microprocessor handles all the extra features beyond the micro:bit's capacity. Standard 4tronix expansion connectors let you plug in accessories like a 5×5 RGB matrix, OLED screen, or RoboFace in place of the included ultrasonic sensor. A MakeCode extension makes it easy to program all features using block coding.
Key Features
- Dual Motors – Independent, fully software-controllable motors
- 145 RGB FireLEDs – Integrated addressable LEDs with included diffuser cover
- Ultrasonic Distance Sensor – Included and pluggable
- Line Following Sensors – Integrated for path tracking
- Light Sensors – Integrated ambient light detection
- Pen Holder – Mounted at the axis of rotation for drawing
- Analog Input – Onboard potentiometer
- Sound Output – Separate onboard buzzer
- I2C Connector – Supports peripherals with both 3V and 5V available
- Button Connector – Duplicate the micro:bit A and B buttons externally
- Extra I/O – 4 additional signals accessible via the onboard microprocessor
- Charger Port – For rechargeable batteries only (requires specific charger, see instructions)
- Power – 4× AA batteries (alkaline or rechargeable)
- Diameter – 140mm
- Height – 45mm (excluding ultrasonic, cover, and micro:bit)
- Weight – 145g (excluding ultrasonic, cover, batteries, and micro:bit)
Ideal For
- Robotics education with BBC micro:bit
- Block coding with MakeCode
- Line following and obstacle avoidance projects
- Creative drawing robots
Package Contents
- 1× Assembled THETA Robot
- 2× Wheels (push-fit onto axles)
- 1× USB cable for programming
- 1× Ultrasonic distance sensor
- 1× Sheet plastic cover and fixings
Jargon buster
Plain-language definitions for the technical terms used above.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- OLED
- OLED stands for organic light-emitting diode, a display type where each pixel produces its own light. It matters because OLED screens are thin, high-contrast and easy to read for small status displays, but they can be more sensitive to image burn-in than some other display types.
- potentiometer
- A variable resistor usually turned with a knob or shaft to create an adjustable electrical signal. It is often used for inputs such as volume, brightness or position, so it helps beginners learn how a microcontroller reads changing values.
- RGB
- Short for red, green and blue, the three primary colours of light that are mixed in varying amounts to make a wide range of colours. In electronics RGB can refer to an LED or pixel that blends these three colours, or to a colour signal or interface that carries separate red, green and blue channels.
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