12 open source boards using the SL2.1A
Real designs built with the SL2.1A, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
RP2040/RP2350Vaio re
CRImier
75 × 65 mm274 parts4LGPL-3.0253
RP2040/RP2350Piano solenoid controller
122.5 × 100 mm179 parts2LGPL-3.0253
RP2040/RP2350Zpn devboard
100 × 100 mm160 parts4LGPL-3.0253
RP2040/RP2350Protoesp
97.5 × 90 mm127 parts2LGPL-3.0253
Friendp
60 × 50 mm79 parts4LGPL-3.0253
RP2040/RP2350Blep audio
60.6 × 24.1 mm75 parts2LGPL-3.0253
RP2040/RP2350Keyboard whiz
65 × 56 mm74 parts2LGPL-3.0253
RP2040/RP2350Simple keeb reuser
49 × 44 mm70 parts2LGPL-3.0253
RP2040/RP2350Zpui shld wg12864b
65 × 56 mm55 parts2LGPL-3.0253
RP2040/RP2350Blep hackerboard
60.6 × 24.1 mm54 parts2LGPL-3.0253
Framework mobo lefthalf
28 × 50 mm45 parts6LGPL-3.0253
Usbc power breakout af
46 × 46 mm37 parts2LGPL-3.0253
The SL2.1A in open source designs
The gallery holds 12 open source boards using the SL2.1A from 1 GitHub repository; a typical one measures about 62.8 × 53 mm and carries around 75 components.
67% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is Vaio re by CRImier.
Microcontrollers on boards using the SL2.1A
What boards using the SL2.1A are built for
SL2.1A: common questions
Where can I find a SL2.1A reference design?
Each of the 12 boards on this page is a real design using the SL2.1A. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the SL2.1A use?
Most are built on RP2040/RP2350 (9).
How big is a typical board using the SL2.1A?
The median is 62.8 × 53 mm, and 67% are two-layer designs.
What is the most popular open source board using the SL2.1A?
By GitHub stars, Vaio re by CRImier, with 253 stars.
Can I simulate one of these boards using the SL2.1A before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.