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INTRODUCTION
Beetle CM-32U4 is a micro Leonardo controller with an onboard charging chip.
As an upgraded version of the DFRobot Beetle Board, this board is greatly optimized in integration and usability, which makes it well applicable to Arduino projects that require compact size and long service life.
Just like the Beetle series, despite a mini body, it has powerful functionalities. On a size of only 22mm*20.5mm, Beetle CM-32U includes most commonly-used communication interfaces: 1×I2C, 1×SPI, 1×UART, 2×analog Interface, 2×digital interface, 2×GND reserved and 1×5V output, which are all designed as pin connector form, more intuitive and easy to use compared with the onboard pads of Beetle. Besides, Beetle CM-32U4 supports official Leonardo firmware, which means you can directly use it in Arduino IDE without extra download.
It integrates the charging management function for Lithium battery. You can easily connect the battery to the board via pins, which could reduce project building difficulty, meanwhile, much smaller and safer.
There are 3 power supply methods: USB power supply; Battery pack power supply on the BAT pin; 5V external power supply on the VIN pin, making this board more widely applicable to DIY projects, workshops, gift projects, E-Textiles wearable, and educational. And the features of rechargeable and diverse power supplies, to some extent, are equivalent to "uninterrupted power supply (UPS)".
Board Overview
FEATURES
- Rich functions
- Small size
- Greatly increase the service life
APPLICATIONS
- DIY projects
- Workshops
- Gift projects
- E-Textiles wearable
SPECIFICATION
- Operating Voltage: 5V DC
- Maximum Charging Current: 600mA
- Minimum Charging Current: 200mA
- Operating Temperature Range: -40~125℃
- Interface: I2C x 1,SPI x 1,UART x 1,Analog x 2,Digital x 2
- Dimension: 22 x 20.5mm/0.87 x 0.81”
DOCUMENTS
- Product wiki
- Schematic
- ATmega32U4 Datasheet
SHIPPING LIST
- Beetle CM-32U4 x1
- 8pin-2.54mm Pin Header x2
Requirements
-
Hardware
- Beetle CM-32U4
- 1000mAh lithium Battery
- USB Cable
-
Software
Board Selection

For any questions, advice or cool ideas to share, please visit the DFRobot Forum(https://www.dfrobot.com/forum/).
Indicator Status description
Status |
Power Indicator(red) |
LED Light(blue) |
Charging Indicator(green) |
OFF |
Mainboard Power off |
Can be set |
Fully charged |
ON |
Mainboard Power on |
Can be set |
Charging |
Flash |
Burning Codes/Resetting |
Resetting/can be set |
No battery |
- The blue LED light can also be used as a normal LED, and you can download Blink.ino to control it. The pin number is 13.
Introduction of Charging Process
Prepare a 1000mAh lithium battery. Connect the positive of the battery to BAT on the Beetle CM-32U4 and the negative to GND, and then connect to the USB charging cable.

At this time, the BAT port will charge the battery with an input current of 200mA~600mA and the green charging light will present the current status of the battery:
Status |
Charging Indicator(green) |
OFF |
Fully charged |
ON |
Charging |
Flash |
No battery |
Introduction of Resetting


NOTE: Only the red power indicator and blue indicator will be affected during the RST process.
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