The Round Carrier is a reference design for the RP2040 Stamp as well as a full-fledged round RP2040 dev board.
The Carrier comes with a combo 3-in-1 SMD/TH/FlexyPin Stamp footprint, you can solder the Stamp directly to the Carrier, use 2mm pin headers + sockets to be able to plug it in and out, or use FlexyPins to pop the Stamp in and out of the Carrier would soldering the Stamp. This way the Carrier also acts as a great Stamp flashing and testing jig.
The board can be powered from the LiPo, or USB Type-C connector.
By using the RP2040 Stamp Carrier, you get everything that comes with the Stamp itself:
- 8MB of FLASH
- 500mA 3.3V LDO
- A Neopixel
- LiPo supply and charging circuit (with charging LED)
- A reset button
- 12MHz crystal
On top of that you get:
- A ring of 16 Neopixels
- Combo 3-in-1 Stamp footprint (SMD/TH/FlexyPin)
- Sewing (conductive thread) and alligator clip-friendly pads
- An on/off switch
- 3.7/4.2V LiPo connector
- USR LED
- Power (3.3V) LED
- Two user buttons
- USB Type-C connector
If you have the LiPo and USB Type-C connected, the battery will begin charging.
The KiCad hardware source files for the board can be found on Github.