3pi+ 32U4 OLED Robot - Standard Edition (30:1 MP Motors), Assembled
In stock, ships same business day if ordered before 2PM
Delivered by Mon, 13th of May
Quantity Discounts:
- 3-6 $242.45 (exc GST)
- 6+ $237.45 (exc GST)
The 3pi+ 32U4 OLED is a versatile, high-performance, user-programmable robot that measures just 9.7 cm (3.8") in diameter. At its heart is an ATmega32U4 AVR microcontroller from Microchip (formerly Atmel), and like Pololu's A-Star 32U4 programmable controllers, the 3pi+ 32U4 features a USB interface and ships preloaded with an Arduino-compatible bootloader, so all you need to program it is a USB A to Micro-B cable (not included). A software add-on is available that makes it easy to program the robot from the Arduino environment, and Pololu have Arduino libraries and example sketches to help get you started. For advanced users who want to customize or enhance their robots with additional peripherals, the robot’s power rails, power system controls, and microcontroller’s I/O lines can be accessed via several 0.1"-pitch expansion ports.
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The 3pi+ (or 3??+) features two H-bridge motor drivers and a variety of integrated sensors, including a pair of quadrature encoders for closed-loop motor control, a complete inertial measurement unit (3-axis accelerometer, gyro, and magnetometer), five downward-facing reflectance sensors for line-following or edge-detection, and left and right bump sensors along the front face of the robot. Three on-board pushbuttons offer a convenient interface for user input, and a 128×64 graphical OLED display, buzzer, and indicator LEDs allow the robot to provide feedback.
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The robot also features a unique power system that runs the motors at a constant 8 V independent of the battery charge level, so the speed of the motors does not vary with the battery voltage.
The 3pi+ 32U4 OLED robot is available as a kit or fully assembled with three different motor options:
| 3pi+ 32U4 OLED Version | Products | Micro Metal Gearmotor | Top Speed | Comments |
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| Standard Edition | assembled or kit | 30:1 MP 6V | 1.5 m/s | good combination of speed and controllability |
| Turtle Edition | assembled or kit | 75:1 LP 6V | 0.4 m/s | longest battery life, easiest to control, good for swarm robots or introductory robotics courses |
| Hyper Edition | assembled or kit | 15:1 HPCB 6V | ~4 m/s | very fast and difficult to control, easy to damage; only recommended for advanced users |
For those who would prefer to use different motors than these versions above, the 3pi+ chassis and 3pi+ 32U4 OLED control board are available separately and can be combined with a pair of motors to make a custom kit.
What else you will need
- four AAA batteries: the 3pi+ robot works with both alkaline and NiMH batteries, though Pololu recommend rechargeable NiMH cells
- a USB A to Micro-B cable to connect the robot to your computer for programming and debugging
Assembling the kit version
Details for item #4975
This product is the assembled Standard Edition of the 3pi+ 32U4 Robot.
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This is a newer 3pi+ 32U4 OLED Robot with a graphical OLED display. For its original version counterpart with an LCD, see the 3pi+ 32U4 Robot – Standard Edition (30:1 MP Motors), Assembled.
3pi+ 32U4 versions
The original version of the 3pi+ 32U4 includes an 8×2 character LCD, while this newer 3pi+ 32U4 OLED incorporates a graphical OLED display instead. The name “3pi+ 32U4” can generally be used to refer to both the original (LCD) and OLED versions, and the documentation in Pololu's updated user’s guide covers both versions.
Pololu's Arduino library for the 3pi+ 32U4 generally allows code written for the LCD version to work on the OLED version with minimal changes (and the reverse is also true as long as your code does not make use of the OLED’s graphical capabilities).
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Comparison with the original 3pi
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Original Pololu 3pi robot. |
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The 3pi+ 32U4 OLED offers many major improvements over the original 3pi, including:
- ATmega32U4 microcontroller with Arduino-compatible bootloader can be programmed directly through a USB connection
- Quadrature encoders on both motors for closed-loop position and speed control
- Graphical OLED display
- Full 9-axis IMU (three-axis gyro, accelerometer, and compass)
- Bottom-loading battery holders keep batteries accessible even if additional levels are added
- Full wrap-around bumper to protect electronics from collisions
- Two bump sensors on the front
The 3pi+ 32U4 uses a different microcontroller with different pin mappings compared to the older 3pi, and some of the software library interfaces are different, so programs written for the original 3pi will not work on the 3pi+ 32U4 without modification.
People often buy this product together with:
 | Thin (2mm) USB Cable A to Micro-B, 6 ft, Low/Full-Speed Only |
Dimensions
| Size: | 97L × 96W × 36H mm |
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| Weight: | 100 g1 |
General specifications
| Assembled: | Y |
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| Version: | Standard Edition (30:1 MP Motors) |
Identifying markings
| PCB dev codes: | 3pi03b |
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| Other PCB markings: | 0J13485 |
Notes:
Documentation and other information
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Pololu 3pi+ 32U4 User’s Guide (Printable PDF)
User’s manual for the Pololu 3pi+ 32U4 robot.
File downloads
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Pololu A-Star 32U4 drivers for Windows (version 1.3.0.0) (7k zip)
This download contains the Windows drivers for the A-Star 32U4 and the rest of Pololu's 32U4 family of boards.
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Pinout and power distribution diagrams of the 3pi+ 32U4 OLED Control Board (1MB pdf)
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Schematic diagram of the 3pi+ 32U4 OLED Control Board (391k pdf)
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3D models of the 3pi+ 32U4 OLED Robot (19MB zip)
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Front, top, and side views of the 3pi+ 32U4 OLED Robot (453k zip)
These DXF drawings make it possible to get various dimension measurements of the 3pi+ 32U4 OLED Robot.
Recommended links
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Arduino integrated development environment (IDE) software
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This repository contains Arduino add-on files, Windows drivers, and bootloaders for the A-Star 328PB, A-Star 32U4, and the rest of Pololu's 32U4 family of boards.
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Microchip’s product page for the ATmega32U4 AVR microcontroller, with links to its datasheet, application notes, and other resources.
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Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.
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International Orders - the following rates are for New Zealand and will vary for other countries:
- $11+ for Pack and Track (3+ days, tracked)
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Our physical address (here's a PDF which includes other key business details):
Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia
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