The Really Bare Bones Board (RBBB) is a mini board designed for those experimental applications that require small processors, such as wearable computing, near space experiments, toy prototyping, artist’s projects or any use for a fairly small, low-cost microcontroller.

As far as we know, it’s the smallest and lowest-cost Arduino-compatible available right now. You can build a RBBB in 45 minutes, even as a beginner. The pin labels on version B2 are now between the pins, similar to the Arduino Nano.

Specifications

• 2.1mm power jack
• Arduino Diecimila bootloader
• ATmega328 Chip
• L4931CZ50-AP TO-92 low dropout regulator (300 mA)
• Note: Regulators such as MC7805CT-BP , LM2940 , or other TO-220 1A regulators make great alternatives if you need more power on your breadboard.

Options

• Bare PCB
• Unassembled kit
• Assembled, populated, and tested board

Resources

• RBBB kit assembly instuctions and schematic

• RBBB design files