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RBBB (Really Bare Bones Board)


SKU: MD004X Categories: ,

Product Description

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.

It’s one of the smallest and lowest-cost Arduino-compatible boards available right now. You can build a RBBB in under half an hour, even as a beginner. The pin labels on version B2 are now between the pins, similar to the Arduino Nano.

We recently added 3.3V models (only the voltage regulator changes) and a bundle with a cable and a BUB II, which may be found here.

Also available in Europe at


  • 2.1mm power jack
  • Optiboot bootloader (Uno setting)
  • 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.
  • We now also have these available with 3.3v regulators (L493133)


  • Unassembled kit
  • PCB only (No parts, no headers)
  • If you’re looking for an RBBB with the parts already soldered on, you should buy the RBBB Pro instead.


Purchase Matrix


MD Part Description
MD0040 RBBB Kit 5 V
MD0041 RBBB Kit 3.3V
MD0046 RBBB, BUB, Cable Bundle (5V, 3’cable default)
MD0060 RBBB PCB only



Additional Information

Weight 45 g
Dimensions 1 x 3 x .1 in

5V, 3.3V