The Olimex RP2350-PICO2-BB48 Is a Breadboard-Friendly Raspberry Pi RP2350B Board Packed with Pins

Bulgarian open-hardware specialist Olimex has announced another pin-heavy take on the Raspberry Pi Pico 2, an RP2350B-based development board it calls the RP2350-PICO2-BB48 — now bringing out all 48 general-purpose input/output (GPIO) pins in a breadboard-friendly footprint.

Olimex founder Tsvetan Usunov unveiled his first take on the Raspberry Pi Pico 2 concept back in November 2024 as the PICO2-XL, a chunky board built around the Raspberry Pi RP2350B microcontroller but with doubled header rows to bring out all 48 general-purpose input/output (GPIO) pins. This would launch in January this year as the PICO2-XL and PICO2-XXL, the latter maintaining the footprint but adding 8MB of pseudo-static SRAM (PSRAM) while bosting the quad-SPI flash storage to 16MB.

Neither design, however, was breadboard-friendly, despite using 0.1" pin spacing for their headers — which is where the non-XL/XXL RP2350-PICO2-BB48 comes in. Like its predecessors, the board is built around the Raspberry Pi RP2350B microcontroller, and like its predecessors it brings out all 48 GPIO pins — but it does so on just two headers, extending the length of the board rather than its width in order to deliver breadboard compatibility.

Other features include the option to include the same generous 8MB of PSRAM and 16MB of flash as the PICO2-XXL, physical reset and boot buttons, a USB Type-C connector for data and power, a 3.3VDC regulator with 2A output, an optional microSD Card slot for additional storage, and Qwiic/STEMMA and UEXT connectors for solderless expansion.

The boards are now available to order on the Olimex store, priced at €9.95 for the RP2350-PICO-BB48 with no PSRAM and 16MB of flash and €13.95 for the RP2350-PICO2-BB48R with 8MB of PSRAM, 16MB of flash, and microSD Card slot. As always, board designs are available on GitHub as KiCad project files under the permissive MIT license.