# 3pi+ 32U4 Robot Kit with 30:1 MP Motors (Standard Edition Kit)

**Type:** Product page · **SKU:** POLOLU-3740 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/3pi-32u4-robot-kit-with-30-1-mp-motors-standard-edition-kit.html ([markdown](https://core-electronics.com.au/3pi-32u4-robot-kit-with-30-1-mp-motors-standard-edition-kit.html.md))

The Pololu 3pi+ 32U4 robot is a complete, high-performance mobile platform based on the Arduino-compatible ATmega32U4 MCU, and this kit contains all the ...

## Pricing

- **Price:** $324.95 (inc GST) — $295.41 AUD, exc GST
- **Quantity discounts:** 3+ $283.59 (exc GST) · 5+ $274.73 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 01 and Sep 04.

## Description

**New version available!** Pololu have released an updated **3pi+ 32U4 OLED Robot** that includes an OLED display with better graphical capabilities than the LCD used by this original 3pi+ 32U4 robot. The OLED version is available with the same three motor options:

- **Standard Edition** ([**assembled**](https://core-electronics.com.au/3pi-32u4-oled-robot-standard-edition-30-1-mp-motors-assembled.html) or [**kit**](https://core-electronics.com.au/3pi-32u4-oled-robot-kit-with-30-1-mp-motors-standard-edition-kit.html))
- **Turtle Edition** ([**assembled**](https://core-electronics.com.au/3pi-32u4-oled-robot-turtle-edition-75-1-lp-motors-assembled.html) or [**kit**](https://core-electronics.com.au/3pi-32u4-oled-robot-kit-with-75-1-lp-motors-turtle-edition-kit.html))
- **Hyper Edition** ([**assembled**](https://core-electronics.com.au/3pi-32u4-oled-robot-hyper-edition-15-1-hpcb-motors-assembled.html) or [**kit**](https://core-electronics.com.au/3pi-32u4-oled-robot-kit-with-15-1-hpcb-motors-hyper-edition-kit.html))

Pololu recommend the newer 3pi+ 32U4 OLED over this original version, which will only be available by special order once Pololu's existing stock runs out.

The 3pi+ 32U4 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](https://core-electronics.com.au/search/?q=a+star+controller), 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](https://core-electronics.com.au/thin-2mm-usb-cable-a-to-micro-b-6-ft-low-full-speed-only.html) (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.

| \| [![](https://core-electronics.com.au/attachments/localcontent/0J11032_441860a289.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11032_149360d3c7b.jpg) \| \|---\| \| 3pi+ 32U4 Robot, front view. \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J11031_57800109b8.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11031_1844300a0b5.jpg) \| \|---\|---\| \| 3pi+ 32U4 Robot, side view. \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J11030_454385db11.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11030_176585cb800.jpg) \| \|---\|---\| \| 3pi+ 32U4 Robot, rear view. \| |
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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 an LCD, buzzer, and indicator LEDs allow the robot to provide feedback.

| [![](https://core-electronics.com.au/attachments/localcontent/0J11023_136570d62ab.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11023_62255579069.jpg) |
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| [![](https://core-electronics.com.au/attachments/localcontent/0J11022_89336c051d6.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11022_408910b0c07.jpg) |
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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 robot is available as a kit or fully assembled with three different motor options:

| 3pi+ 32U4 Version | Products | Micro Metal Gearmotor | Top Speed | Comments |
|---|---|---|---|---|
| Standard Edition | [assembled](https://core-electronics.com.au/3pi-32u4-robot-standard-edition-30-1-mp-motors-assembled.html) or [kit](https://core-electronics.com.au/3pi-32u4-robot-kit-with-30-1-mp-motors-standard-edition-kit.html) | [30:1 MP 6V](https://core-electronics.com.au/30-1-micro-metal-gearmotor-mp-6v-with-extended-motor-shaft.html) | 1.5 m/s | good combination of speed and controllability |
| Turtle Edition | [assembled](https://core-electronics.com.au/3pi-32u4-robot-turtle-edition-75-1-lp-motors-assembled.html) or [kit](https://core-electronics.com.au/3pi-32u4-robot-kit-with-75-1-lp-motors-turtle-edition-kit.html) | [75:1 LP 6V](https://core-electronics.com.au/75-1-micro-metal-gearmotor-lp-6v-with-extended-motor-shaft.html) | 0.4 m/s | longest battery life, easiest to control, good for swarm robots or introductory robotics courses |
| Hyper Edition | [assembled](https://core-electronics.com.au/3pi-32u4-robot-hyper-edition-15-1-hpcb-motors-assembled.html) or [kit](https://core-electronics.com.au/3pi-32u4-robot-kit-with-15-1-hpcb-motors-hyper-edition-kit.html) | [15:1 HPCB 6V](https://core-electronics.com.au/15-1-micro-metal-gearmotor-hpcb-6v-with-extended-motor-shaft.html) | ~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](https://core-electronics.com.au/category/141/micro-metal-gearmotors-with-extended-motor-shafts) than these versions above, the [3pi+ chassis](https://core-electronics.com.au/3pi-chassis-kit-no-motors-or-electronics.html) and [3pi+ 32U4 control board](https://core-electronics.com.au/3pi-32u4-control-board.html) 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](https://core-electronics.com.au/rechargeable-nimh-aaa-battery-1-2-v-900-mah-1-cell.html): the 3pi+ robot works with both alkaline and NiMH batteries, though Pololu recommend rechargeable NiMH cells
- a [USB A to Micro-B cable](https://core-electronics.com.au/thin-2mm-usb-cable-a-to-micro-b-6-ft-low-full-speed-only.html) to connect the robot to your computer for programming and debugging

**Assembling the kit version**

**Details for item #3740**

This an **original** 3pi+ 32U4 Robot Kit with an LCD. Pololu recommend the newer **3pi+ 32U4 OLED** instead, which includes a graphical OLED display; the updated version of this item is the [**3pi+ 32U4 OLED Robot Kit with 30:1 MP Motors (Standard Edition Kit)**](https://core-electronics.com.au/3pi-32u4-oled-robot-kit-with-30-1-mp-motors-standard-edition-kit.html).

This product is the **kit version** of the **Standard Edition** 3pi+ 32U4 Robot. Assembly (including soldering) is required.

| [![](https://core-electronics.com.au/attachments/localcontent/0J11039_53419aebf7a.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11039_29859f29db5.jpg) |
|---|
| 3pi+ 32U4 Robot Kit (Standard or Turtle Edition). |

This kit includes:

- [3pi+ Chassis Kit](https://core-electronics.com.au/3pi-chassis-kit-no-motors-or-electronics.html)
- [3pi+ 32U4 Control Board](https://core-electronics.com.au/3pi-32u4-control-board.html)
- two [30:1 MP 6V Micro Metal Gearmotors with extended motor shafts](https://core-electronics.com.au/30-1-micro-metal-gearmotor-mp-6v-with-extended-motor-shaft.html)
- one [8×2 character LCD](https://core-electronics.com.au/8x2-character-lcd-black-bezel-parallel-interface.html)

**3pi+ 32U4 versions**

This original version of the 3pi+ 32U4 includes an [8×2 character LCD](https://core-electronics.com.au/8x2-character-lcd-black-bezel-parallel-interface.html), while the newer **3pi+ 32U4 OLED** incorporates a [graphical OLED display](https://core-electronics.com.au/graphical-oled-display-128x64-1-3-white-spi.html) 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).

| \| [![](https://core-electronics.com.au/attachments/localcontent/0J11033_30963a9109e.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11033_794879c7937.jpg) \| \|---\| \| 3pi+ 32U4 Robot, top view. \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J11322_344992dde0e.jpg)](https://core-electronics.com.au/attachments/localcontent/0J11322_878056b614e.jpg) \| \|---\|---\| \| 3pi+ 32U4 OLED Robot, top view. \| |
|---|

**Comparison with the original 3pi**

| [![](https://core-electronics.com.au/attachments/localcontent/0J2415_244097956e6.jpg)](https://core-electronics.com.au/attachments/localcontent/0J2415_311798e523c.jpg) |
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| Original Pololu 3pi robot. |

The 3pi+ 32U4 offers many major improvements over the [original 3pi](https://core-electronics.com.au/pololu-3pi-robot.html), 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
- 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.

**Dimensions**

 | Size: | 97L × 96W × 36H mm |
|---|---|
| Weight: | 100 g[1](https://core-electronics.com.au/#note1) |

**General specifications**

 | Assembled: | N |
|---|---|
| Version: | Standard Edition (30:1 MP Motors) |

**Notes:**

1Of assembled robot without batteries. **Documentation and other information**

- ![](https://core-electronics.com.au/attachments/localcontent/0J11323_552447e8ac.jpg)**Pololu 3pi+ 32U4 User’s Guide (Printable PDF)**
    
    User’s manual for the Pololu 3pi+ 32U4 robot.
 
**File downloads**

- **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.
- **Pinout and power distribution diagrams of the 3pi+ 32U4 Control Board (1MB pdf)**
- **Schematic diagram of the 3pi+ 32U4 Control Board (584k pdf)**
- **Dimension diagram of the 3pi+ 32U4 Robot (1MB pdf)**
- **3D models of the 3pi+ 32U4 Robot (18MB zip)**
    
    This model uses simplified models of the control electronics to reduce the file size. A more detailed model of the 3pi-plus-32u4-control-board (28MB step) is available separately.
- **Front, top, and side views of the 3pi+ 32U4 Robot (471k zip)**
    
    These DXF drawings make it possible to get various dimension measurements of the 3pi+ 32U4 Robot.
 
**Recommended links**

- **[Pololu3piPlus32U4 Arduino library](https://github.com/pololu/pololu-3pi-plus-32u4-arduino-library)**
- **[Pololu3piPlus32U4 library documentation](https://pololu.github.io/pololu-3pi-plus-32u4-arduino-library/)**
- **[Arduino Software](https://www.arduino.cc/en/software/)**
    
    Arduino integrated development environment (IDE) software
- **[A-Star repository on GitHub](https://github.com/pololu/a-star)**
    
    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.
- **[ATmega32U4 documentation](https://www.microchip.com/en-us/product/ATmega32u4)**
    
    Microchip’s product page for the ATmega32U4 AVR microcontroller, with links to its datasheet, application notes, and other resources.

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_154.jpg)