Petoi Bittle V2 STEM Kit

Petoi Bittle is a compact, programmable walking robot in the form of a dog, designed for learning robotics, programming, and STEM (Science, Technology, Engineering, and Mathematics) projects. The design utilizes nine servos that enable four-legged movement and head rotation.

The robot can perform over 35 pre-programmed movements and behaviors, including walking, running, sitting, stretching, push-ups, somersaults, and self-restoration after falling. Control can be achieved via a remote control, mobile app, computer, or commands sent via a programming interface.

Bittle runs on the open OpenCat environment and can be programmed using graphical blocks, Python, and C/C++. The design also allows for the connection of optional sensors, cameras, communication modules, and Raspberry Pi computers. The robot is intended for users aged 10 and older, schools, universities, laboratories, hobbyists, and those just beginning to learn robotics.

Available Models and Variants

Bittle STEM Kit

This version is designed primarily for education, programming, and basic robotics projects.
Equipped with lightweight P1L servos.
Servo gears are made of plastic.
Reduced weight and reduced mechanical stress on the structure.
Suitable for classrooms, workshops, coding, and standard robot movements.
Available colors: black, yellow, and blue.
Available as a self-assembly kit or pre-assembled.

Bittle Robotics Kit

This version is designed for more advanced projects, experiments, research applications, and integration with additional modules.
Equipped with P1S servos with alloy metal gears.
Greater durability and mechanical resistance of the servos.
Higher torque, suitable for more demanding movements and additional load.
Available colors: black and yellow.
Available as a self-assembly kit or pre-assembled.

The construction kit requires approximately 40–90 minutes for assembly, calibration, and configuration. The assembled version is ready to use right out of the box.

Other models in the Bittle family:
Bittle X – a newer version based on the BiBoard controller with an ESP32 processor and a built-in voice control module.
Bittle X V2 – an evolved version using the BiBoard V1 controller and feedback servos.
Bittle X V2+Arm – a version equipped with a programmable arm with a gripper.

The basic Bittle STEM Kit and Robotics Kit use the Arduino Uno-compatible NyBoard board, while the Bittle X models are based on the more powerful ESP32 platform.

Technical Specifications

Device Type: Programmable quadruped walking robot.
Design: Dog-shaped robot.
Dimensions: 200 × 110 × 110 mm.
Weight: 265 to 290 g, depending on the servos and configuration used.
Frame Material: Plastic.
Number of Controlled Joints: 9.
Degrees of Freedom: 9 DOF (Degrees of Freedom).
Leg System: Two Controlled Joints per Leg.
Head Movement: One servo for left and right head rotation.
Number of Servos Included: 10, including one spare.
Servo Type:
Bittle STEM Kit – P1L Lite with plastic gears,
Bittle Robotics Kit – P1S Alloy with metal gears. Servo motors: Coreless.
Maximum servo voltage: 8.4 V.
Controller: NyBoard V1.
Controller compatibility: Arduino Uno.
Processor: ATmega328P.
External EEPROM: 64 Kbit.
IMU [Inertial Measurement Unit]: Six-axis MPU6050.
PWM [Pulse Width Modulation] channels: 16.
Grove connectors: 4.
NeoPixel RGB LEDs: 7.
Controller interfaces: UART, I²C, IR receiver, and buzzer.
Wired connectivity: Micro-USB.
Wireless connectivity: Bluetooth or Wi-Fi via optional communication modules.
Raspberry Pi support: Yes.
Support for additional cameras and sensors: yes, via expansion modules and Grove connectors.
Number of pre-installed movements and behaviors: over 35.
Estimated operating time: approximately 1 hour of continuous walking.
Battery type: lithium-ion.
Battery parameters: 7.4 V, 1000 mAh.
Typical operating current: 2 A.
Maximum current: 5 A.
Estimated charging time: approximately 2 hours.
Recommended charger: USB 5 V / 1 A.
AC charger included: no.
Charging cable: Micro-USB to USB included.
Recommended user age: 10 years and up.
Water resistance: no – the robot is not waterproof.
Declared load capacity: up to approximately 1 pound, or approximately 0.45 kg.
Recommended safe speed: approximately two body lengths per second.

Software Required for Operation

No programming is required for basic robot control. Bittle can be operated using the included remote control or the mobile app. Software is required for calibration, firmware updates, and creating custom movements and behaviors.

Petoi Mobile App
The official Petoi mobile app.
Enables robot movement control.
Enables pre-defined behaviors and movement sequences.
Enables walking speed adjustment.
Enables creating and saving custom command sequences.
Includes a joint calibration interface.
Available for Android and iOS.

Petoi Desktop App
Software for computers running Windows, macOS, Linux, and ChromeOS.
Enables firmware installation and updates.
Enables servos calibration.
Includes the Skill Composer tool for creating custom movements.
Supports wired and Bluetooth connections.
Is open source.

Petoi Coding Blocks
A graphical, drag-and-drop programming environment. Scratch-like interface.
Designed for beginners and education.
Enables programming without prior knowledge of programming language syntax.
Can generate Python code, which the user can then analyze and modify.
Supports wired and Bluetooth connections.
Requires OpenCat 2.0 firmware to utilize the full feature set.

Arduino IDE
An environment designed for programming the NyBoard controller.
Enables the creation and modification of firmware in C and C++.
Enables the definition of custom movements, responses, sensor control, and robot behavior.
Available for Windows, macOS, Linux, and ChromeOS.
Intended primarily for more advanced users.

OpenCat
An open-source firmware and software environment for Petoi quadrupedal robots.
Responsible for controlling movement, gait, balance, and programmed behaviors.
Enables the modification of the robot's operation and the development of custom projects.
The basic version of Bittle uses a variant of OpenCat designed for the NyBoard controller.

OpenCat Python Serial API
An open programming interface in Python.
Enables sending commands to the robot via the serial port.
Can be used for integration with external programs.
Enables the creation of projects using image and voice recognition, automated scheduling, and artificial intelligence algorithms.

The Arduino IDE or programming knowledge are not required to use the remote control or mobile app alone. The Arduino IDE, Petoi Coding Blocks, and Python API are only needed when creating your own functions and projects.