Beetle CM-32U4 Board – Arduino Leonardo Compatible – ATmega32U4

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 featuresmaking 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

• Compatible with Arduino Leonardo / ATmega32U4

• Built-in Li-ion battery charging management for your Beetle CM-32U4 development board

• 3 power supply options: USB, BAT pin, or VIN pin on this ATmega32U4 microcontroller

• Multiple I/O interfaces: UART, SPI, I2C, analog, digital ports on the Beetle CM-32U4 board

• Compact size: only 22 20.5 mm Arduino Leonardo compatible board

• Plug-and-play support with Arduino IDE for the Beetle CM-32U4 microcontroller

Specifications

Electrical Parameters

• Operating Voltage: 5V DC Beetle CM-32U4 power

• Max Charging Current: 600mA on this development board

• Min Charging Current: 200mA for the ATmega32U4 system

• Operating Temperature: -40 ~ 125C stable microcontroller performance

• Dimension: 22 20.5 mm / 0.87 0.81″ Beetle CM-32U4 size

Interfaces

• I2C 1 Beetle CM-32U4 interface

• SPI 1 Arduino Leonardo compatible pin

• UART 1 ATmega32U4 serial port

• Analog 2 Beetle CM-32U4 inputs

• Digital 2 microcontroller pins

• 5V Output Pin 1 on this development board

• Battery Input (BAT) 1 for Beetle CM-32U4

Power Supply Options

• USB power for Beetle CM-32U4

• Li-ion battery (via BAT pin) for ATmega32U4 board

• 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

• DIY electronics Beetle CM-32U4 projects

• Smart gifts with Arduino Leonardo compatible board

• Wearable tech using ATmega32U4 microcontroller

• Arduino mini drone with Beetle CM-32U4

• 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

• Beetle CM-32U4 development board 1

• 8-pin 2.54mm Pin Header for Beetle CM-32U4 2

Reference

Product wiki for Beetle CM-32U4 board

Beetle CM-32U4 Schematic

ATmega32U4 Datasheet for development board