Pololu 4974 / 4975 / 4976 3pi+ 32U4 OLED Robot - Assembled
Pololu 4974 / 4975 / 4976 3pi+ 32U4 OLED Robot - Assembled
Pololu 4974 / 4975 / 4976 3pi+ 32U4 OLED Robot - Assembled
The Pololu 3pi+ 32U4 OLED is a fully assembled autonomous mobile robot platform featuring an ATmega32U4 microcontroller, dual micro metal gearmotors, and a 128x64 OLED display for real-time feedback and diagnostics. Professional roboticists, educators, and hobbyists use this platform to develop line-following algorithms, obstacle avoidance systems, and autonomous navigation solutions with minimal assembly time. This pre-assembled configuration solves the critical challenge of rapid prototyping and testing of mobile robotics applications without the complexity of component-level integration.
Product Overview
The Pololu 3pi+ 32U4 OLED represents the evolution of the iconic 3pi robot platform, combining a compact form factor with advanced onboard sensing and processing capabilities. The robot integrates five reflectance sensors for line detection, a 9-axis inertial measurement unit (3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer), and an ATmega32U4 microcontroller running at 16 MHz with 32 KB of flash memory. The 128x64 OLED display provides crucial real-time visualization of sensor data, battery voltage, and algorithm performance metrics, enabling rapid debugging and optimization of control strategies without requiring external serial communication.
The dual micro metal gearmotors deliver 150:1 gear reduction with independent PWM speed control through integrated motor drivers, enabling precise trajectory control and turning maneuvers. Power management is handled by a 4-cell AA battery holder with integrated low-battery detection, providing approximately 2-3 hours of continuous operation depending on motor load and driving patterns. The assembled configuration includes all mechanical components pre-installed, reducing setup time from several hours to minutes, making it ideal for classroom environments, robotics competitions, and research applications where rapid iteration is essential.
Key Specifications
| Specification | Details |
| Product Type | Autonomous Mobile Robot Platform - Fully Assembled |
| Brand | Pololu Robotics and Electronics |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Microcontroller | ATmega32U4 at 16 MHz with 32 KB Flash Memory |
| Motor Type | Dual Micro Metal Gearmotors with 150:1 Gear Reduction |
| Sensors | 5x Reflectance Sensors, 9-Axis IMU (Accel/Gyro/Mag), Bump Sensors |
| Display | 128x64 OLED Display with I2C Interface |
| Battery | 4x AA Battery Holder (6V nominal, 4.5V minimum operating) |
| Dimensions | 81mm x 70mm x 32mm (3.2 x 2.75 x 1.25 inches) |
| Weight | Approximately 150 grams without batteries |
| Motor Speed | Approximately 1 meter per second maximum forward speed |
Key Features
- Pre-assembled platform eliminates mechanical integration complexity, reducing setup time to under 5 minutes and allowing immediate algorithm development focus
- 128x64 OLED display provides real-time sensor visualization and debugging without external serial connections, critical for field testing and competition environments
- 9-axis inertial measurement unit enables advanced motion control algorithms including gyroscopic stabilization, accelerometer-based impact detection, and magnetometer-based compass heading
- Five reflectance sensors with individual LED control allow sophisticated line-following strategies including edge detection, intersection recognition, and grayscale terrain mapping
- ATmega32U4 microcontroller with native USB connectivity simplifies programming via Arduino IDE with Pololu-optimized libraries and example code
- Dual independent motor control with PWM speed regulation enables precise differential drive kinematics for accurate turning radius and trajectory planning
Applications and Use Cases
- Line-following robotics competitions where the reflectance sensor array and OLED feedback enable rapid tuning of PID control parameters for optimal track navigation performance
- Educational robotics curricula in schools and universities teaching autonomous systems, sensor integration, embedded C programming, and real-time control theory with hands-on experimentation
- Research and development of obstacle avoidance algorithms using the IMU data fusion with reflectance sensors to create hybrid navigation strategies combining line-following with collision avoidance
- Robotics club projects and maker community applications where the pre-assembled configuration and extensive documentation enable rapid prototyping of custom autonomous behaviors and sensor payloads
How to Use
Begin by installing four AA batteries into the battery holder on the underside of the robot, ensuring correct polarity alignment to prevent microcontroller damage. Connect the robot to your computer via the integrated USB port using a standard micro-USB cable. The ATmega32U4 appears as a COM port and is compatible with the Arduino IDE after installing the Pololu AVR boards package. The Pololu 3pi+ libraries provide pre-written functions for reflectance sensor reading, motor control, OLED display output, and IMU data acquisition, allowing you to focus on algorithm development rather than low-level hardware abstraction.
Start with the provided example sketches to verify sensor functionality and motor response. Use the OLED display to monitor reflectance sensor readings in real-time by printing values directly to the screen. Develop your line-following algorithm using proportional-integral-derivative (PID) control, adjusting gains based on the live sensor feedback visible on the display. The robot's compact size and responsive motors allow rapid testing of algorithm modifications without requiring external test equipment or serial monitoring tools.
Frequently Asked Questions
What is the difference between models 4974, 4975, and 4976?
These model numbers represent different package configurations and regional variants of the same core 3pi+ 32U4 OLED platform. Model 4974 includes the robot with standard reflectance sensor configuration, 4975 includes additional accessories such as wheels and caster ball, and 4976 includes expanded sensor packages. All variants share identical microcontroller, motor, and OLED display specifications. Contact our technical team for specific configuration details of your required model.
Can I add external sensors to the robot's I2C bus?
Yes, the ATmega32U4 exposes I2C (SDA/SCL) pins on the expansion header, allowing connection of additional sensors such as distance sensors, color sensors, or temperature sensors. The Pololu libraries include I2C master functionality, and the OLED display itself uses I2C, demonstrating the bus's reliability for multi-device communication. Ensure proper pull-up resistor configuration and voltage compatibility (3.3V logic levels) when adding external devices.
What programming language and development environment should I use?
The robot is programmed using C/C++ through the Arduino IDE, which provides a simplified interface to the ATmega32U4 hardware. Pololu provides comprehensive libraries with functions for motor control, sensor reading, and OLED display management. Advanced users can also program directly using Atmel Studio or command-line AVR toolchain for maximum optimization and control. All example code and documentation are provided in Arduino-compatible format.
How long does the battery last during typical operation?
With four AA alkaline batteries, the robot operates continuously for approximately 2-3 hours depending on motor load, driving speed, and OLED display usage. Battery life extends to 4-5 hours with high-capacity rechargeable NiMH batteries. The onboard battery monitoring circuit provides voltage readings via the analog-to-digital converter, allowing your code to detect low-battery conditions and implement graceful shutdown procedures.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
Why Buy from The Tech Depot
- Genuine Products: Sourced directly from authorized distributors with authentication
- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
- Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy Pololu 4974 / 4975 / 4976 3pi+ 32U4 OLED Robot - Assembled Online in India
Purchase the Pololu 4974 / 4975 / 4976 3pi+ 32U4 OLED Robot - Assembled online at The Tech Depot, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Pololu 4974 / 4975 / 4976 3pi+ 32U4 OLED Robot - Assembled with fast shipping and expert support.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.