Beetle CM-32U4 is a micro Leonardo-compatible development board based on the ATmega32U4 MCU. Designed for compact DIY and wearable applications, it features a built-in Lithium battery charging circuit, multiple communication interfaces, and full Arduino IDE support with no additional setup. This Beetle CM-32U4 development board offers an ideal solution for those seeking a mini Arduino Leonardo microcontroller for space-constrained electronics.
As an upgraded version of the DFRobot Beetle Board, this module retains the small form factor (just 22mm × 20.5mm) while integrating additional power management and charging features—making it safer, more powerful, and easier to use in tight spaces. The Beetle CM-32U4 ATmega32U4 board is a versatile Arduino Leonardo compatible microcontroller designed for reliability.
Features
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Compatible with Arduino Leonardo / ATmega32U4
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Built-in Li-ion battery charging management for your Beetle CM-32U4 development board
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3 power supply options: USB, BAT pin, or VIN pin on this ATmega32U4 microcontroller
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Multiple I/O interfaces: UART, SPI, I2C, analog, digital ports on the Beetle CM-32U4 board
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Compact size: only 22 × 20.5 mm Arduino Leonardo compatible board
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Plug-and-play support with Arduino IDE for the Beetle CM-32U4 microcontroller
Specifications
Electrical Parameters
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Operating Voltage: 5V DC Beetle CM-32U4 power
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Max Charging Current: 600mA on this development board
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Min Charging Current: 200mA for the ATmega32U4 system
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Operating Temperature: -40 ~ 125°C stable microcontroller performance
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Dimension: 22 × 20.5 mm / 0.87 × 0.81" Beetle CM-32U4 size
Interfaces
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I2C ×1 Beetle CM-32U4 interface
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SPI ×1 Arduino Leonardo compatible pin
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UART ×1 ATmega32U4 serial port
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Analog ×2 Beetle CM-32U4 inputs
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Digital ×2 microcontroller pins
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5V Output Pin ×1 on this development board
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Battery Input (BAT) ×1 for Beetle CM-32U4
Power Supply Options
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USB power for Beetle CM-32U4
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Li-ion battery (via BAT pin) for ATmega32U4 board
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5V external source (via VIN pin) on this Arduino Leonardo development board
These flexible options allow the Beetle CM-32U4 to work like a mini UPS, perfect for mobile, wearable, or backup-critical ATmega32U4 development board projects.
Applications
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DIY electronics Beetle CM-32U4 projects
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Smart gifts with Arduino Leonardo compatible board
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Wearable tech using ATmega32U4 microcontroller
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Arduino mini drone with Beetle CM-32U4
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Workshops and education using this development board
Example Project
Make a TINY Arduino Drone with FPV Camera – Will It Fly?
Create a micro FPV drone using the Beetle CM-32U4, powered by brushed motors and programmed via Arduino IDE. This project shows the real-world use of this ATmega32U4 development board in flight control and agile robotics.
Shipping List
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Beetle CM-32U4 development board ×1
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8-pin 2.54mm Pin Header for Beetle CM-32U4 ×2