minimal/tiny open-source/DIY shield for Raspberry Pi boards, providing hardware compatibility with the norns ecosystem.
shield support will stay in sync with the primary norns codebase, without any branches or mods.
minimal part count to get a basically complete norns system for minimal cost.
- audio codec: CS4720 (same as norns)
- audio jacks: 3.5mm stereo in/out, line level
- OLED: NHD-2.7-12864WDW3
- 3x pushbuttons, 3x rotary encoders
component BOM on octopart - $20 (does not include OLED or pi)
oshpark PCB - 3 for $53
pi 3 and 4 being tested now
this shield does not have a headphone driver or a battery charging circuit. it also does not have an FTDI serial converter built in, but the UART pins are broken out for a UART-USB cable.
components are SMD— not tiny, but not beginner (0603 passives). i’ll run a batch of PCBs with SMD populated so anyone can DIY by just thru-hole soldering a few components. pricing TBD— it will be inexpensive as the prices come way down at quantity.
the final disk image and PCB is nearly proven. i would not suggest ordering a PCB until we clear what’s on the desk right now. @ngwese and @simonvanderveldt have been doing great work on a new buildroot-based image generation system.
i’m posting this just in advance of completion as i’m looking for anyone interested in developing some enclosure designs— both 3D printing and laser would work well here. i’ve kept mounting holes in line with the existing pi mounting.
anyone with eagle can jump right in, though i’ll export a DXF outline of the board to assist with some designs.