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This programmable module combines with a Raspberry Pi to serve as the control center of a small robot or electronics project. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader, and the board includes dual motor drivers that can deliver 1.8 A per channel to two brushed DC motors.
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Pololu - 3117
This programmable module combines with a Raspberry Pi to serve as the control center of a small robot or electronics project. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader, and the board includes dual motor drivers that can deliver 1.8 A per channel to two brushed DC motors. An efficient voltage regulator and level shifters enable it to power and communicate with a Raspberry Pi. This version (item #3117) is assembled with selected through-hole connectors and components installed for use as a Raspberry Pi add-on.
DESCRIPTION
Overview
The A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge is a programmable module well-suited for robotics applications, designed to work either as an auxiliary controller mounted to a Raspberry Pi or as a standalone control solution for a small robot. This A-Star (abbreviated A*) is based on Atmel’s ATmega32U4 AVR microcontroller, which has built-in USB functionality, and it ships with a preloaded Arduino-compatible bootloader. Its complement of peripheral hardware includes dual motor drivers capable of delivering a continuous 1.8 A per channel, along with pushbuttons, LEDs, and an optional buzzer for building a user interface. An efficient switching voltage regulator allows the controller to work over a wide range of input voltages (2.7 V to 11 V).
The robot controller board conforms to the Raspberry Pi HAT specification, allowing it to be used as an add-on for a Raspberry Pi with a 40-pin GPIO header (Model B+, Model A+, and Pi 2 Model B). On-board level shifters make it easy to set up I²C communication and interface other signals between the two controllers, and the A-Star automatically supplies 5 V power to an attached Raspberry Pi. In this setup, the Raspberry Pi can handle the high-level robot control while relying on the A-Star for low-level tasks like reading analog sensors and controlling timing-sensitive devices (e.g. servos).
A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge,
bottom view with dimensions.
The robot controller is available in two configurations:
Details for item #3117
A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge
with included hardware.
This version of the A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge is assembled with selected through-hole connectors and components for use as a Raspberry Pi expansion board, as shown in the picture above. A 2×20-pin 0.1″ female header is preinstalled to serve as a Raspberry Pi GPIO connector, and a 6-pin strip of terminal blocks and a DC power jack are mounted for motor and power connections. A buzzer is also installed, along with two 2×1-pin male headers and shorting blocks for the buzzer and battery level jumpers.
This version ships with a set of four M2.5 standoffs (11 mm length), screws, and nuts that can be used to secure the board to the Raspberry Pi at the proper height for the GPIO connector.
For a version with SMT components only, making it more suitable for standalone use and allowing customization of through-hole components, see item #3116.
Features
Driving motors with an A-Star 32U4 Robot Controller LV
with Raspberry Pi Bridge on a Raspberry Pi Model B+.
Arduino compatibility
Like our other A-Star 32U4 programmable controllers, the A-Star 32U4 Robot Controller ships with a preloaded Arduino-compatible bootloader (which uses 4 KB of flash memory, leaving 28 KB available for the user program). We provide a software add-on that enables the board to be easily programmed from the Arduino environment and an Arduino library to make it easy to use the additional on-board hardware.
The A-Star 32U4 Robot Controller has the same microcontroller as the Arduino Leonardo and Arduino Micro, and it runs at the same frequency, so most code examples intended for those boards should also work on the A-Star.
The A-Star family
The A-Star 32U4 Robot Controller is a part of our larger A-Star 32U4 family, all of whose members are based on the same ATmega32U4 microcontroller, feature native USB interfaces, and are preloaded with Arduino-compatible bootloaders. The table below shows some key features and specifications of our A-Star microcontroller boards to help you choose the right one for your application.
A-Star 32U4 Micro | A-Star 32U4 Mini ULV | A-Star 32U4 Mini LV | A-Star 32U4 Mini SV | A-Star 32U4 Prime LV | A-Star 32U4 Prime SV | |
---|---|---|---|---|---|---|
Microcontroller: | ATmega32U4 | ATmega32U4 | ATmega32U4 | |||
User I/O lines: | 18 | 26 | 26 | |||
PWM outputs: | 7 | 7 | 7 | |||
Analog inputs: | 8 | 12 | 12 | |||
Ground access points: | 2 | 4 | 43 | |||
User LEDs: | 2 | 3 | 3 | |||
User pushbuttons: | — | — | 3 | |||
Reset button: | YES | YES | ||||
Power switch: | YES | |||||
Buzzer option: | YES | |||||
microSD option: | YES | |||||
LCD option: | YES | |||||
Operating voltage: | 5.5 V to 15 V | 0.5 V to 5.5 V | 2.7 V to 11.8 V | 5 V to 36 V | 2.7 V to 11.8 V | 5 V to 36 V |
Regulator type: | linear | switching step-up |
switching step-up/step-down |
switching step-down |
switching step-up/step-down |
switching step-down |
Regulated current: | 100 mA(1) | 500 mA(1) | 1 A(1) | 500 mA(1) | 1 A(1) | 1 A(1) |
Dimensions: | 1″ × 0.6″ | 1.9″ × 0.7″ | 2.8″ × 2.1″ | |||
Weight: | 1.3 g(2) | 3.4 g(2) | 13 g to 33 g |
(1) These values are rough approximations for comparison purposes. Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology. See product documentation and performance graphs for details.
(2) Without included optional headers.
SPECIFICATIONS
Dimensions
Size: | 65 mm × 56 mm |
---|---|
Weight: | 23 g(1) |
General specifications
Processor: | ATmega32U4 @ 16 MHz |
---|---|
RAM size: | 2560 bytes |
Program memory size: | 32 Kbytes(2) |
Motor driver: | DRV8838 |
Motor channels: | 2 |
User I/O lines: | 26(3) |
Input voltage range: | 2.7 V to 11 V |
Minimum operating voltage: | 2.7 V |
Maximum operating voltage: | 11 V |
Maximum output current: | 1.5 A(4) |
Continuous output current per channel: | 1.8 A |
Peak output current per channel: | 1.8 A |
Logic voltage: | 5 V |
Reverse voltage protection?: | YES |
External programmer required?: | NO |
Notes:
(1) Without included mounting hardware.
(2) Note that 4 KB of the MCUs 32 KB of flash memory is used by the pre-installed USB bootloader. All 32 KB is available when programming via the ISP header rather than the bootloader.
(3) Some I/O lines are used by on-board hardware.
(4) Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology. See product documentation and performance graphs for details.
RESOURCES
Documentation and other information
File downloads
Recommended links
Raspberry Pi 3 model B (Quad Core Broadcom BCM2837, 4x1.2GHz ARM Cortex-A53, RAM 1GB, 4xUSB, Ethernet, HDMI, Wifi, Bluetooth)
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DC motor driver that allows you to control the movement of two drives using the I2C interface. Board with soldered connectors. Pololu 5048
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DC motor driver that allows you to control the movement of two drives using the I2C interface. Board with connectors for assembly. Pololu 5058
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HAT module with a driver for two DC motors designed for Raspberry Pi. Motors can be powered with the voltage from 6.5 to 30 V and draw a maximum current of up to 18 A. Pololu 3751
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HAT module with TB6612FNG motor driver and PCA9685 PWM driver designed for Raspberry Pi minicomputers. The board is equipped with a 40-pin connector. Adafruit 4280
Dual MAX14870 Motor Driver is a dual DC driver compatible with Raspberry Pi that allows you to control two DC motors with 4.5-36V continuous current of 1.7A. Pololu 3759
DC motor driver that allows you to control the movement of two drives using the I2C interface. Board without connectors. Pololu 5056
No product available!
This programmable module combines with a Raspberry Pi to serve as the control center of a small robot or electronics project. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader, and the board includes dual motor drivers that can deliver 1.8 A per channel to two brushed DC motors.