Spell tome bottom

About the Spell tome bottom PCB

Spell tome bottom is an open source RP2040/RP2350 PCB design by bitshiftcrazy, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 69.9 × 100 mm, with 25 components from 16 distinct parts.

Its main chip is the XIAO-RP2040-DIP, from the RP2040/RP2350 family. Other key parts include the MCP1640X-XCHY. By type, the board carries 8 capacitors, 6 resistors, 5 switches, 2 ICs, 2 connectors and 1 diode.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

A handheld PCB spell tome for tabletop RPGs, the cringiest text adventures you'll ever play and mini games no one asked for. Built around a tiny OLED for minimal gaming and a Seeed Studio XIAO RP2040 for maximum reprogramming comfort.

A handheld fantasy-themed PCB spell tome designed for tabletop RPGs and other shenanigans.

The Spell Tome is a sandwiched, book-like PCB build consisting of a functional electronics PCB and a decorative top PCB. Originally it was designed as a magical artifact for a custom text adventure and small games.

Right now it's evolving into anything that can be done with a tiny OLED and 4 buttons (stay tuned!).

Spell tome bottom, from the project README — From the project README

Main components on the Spell tome bottom

XIAO-RP2040-DIP MCP1640X-XCHY

Spell tome bottom bill of materials (BOM)

25 components, 16 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	XIAO-RP2040-DIP	XIAO-RP2040-DIP	U1
1	MCP1640X-XCHY MCP1640x-xCHY	SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR	U2
1	CONN_01X04_PIN Conn_01x04_Pin	PinHeader_1x04_P2.54mm_Vertical	J1
1	CONN_01X02_PIN Conn_01x02_Pin	PinHeader_1x02_P2.54mm_Vertical	J2
4	C596271 SW_Push_my	SW-SMD_4P-L3.4-W3.4-P2.15-LS4.2	SW1, SW3, SW4, SW5
1	SW_SPDT_321	SW-SMD_SSSS810701	SW2
1	C2874115 LED_RABG	LED-ARRAY-SMD_4P-L1.6-W1.5-TL_NH-B1515RGBA	D1
1	L	IND-SMD_L6.0-W6.0_NR6028T2R2N	L1
3	10uF	C_0805_2012Metric	C1(CIN)1, C3(COUT)1, C3(COUT)2
4	0.1uF	C_0603_1608Metric	C2(CIN_HF)1, C4(COUT_HF)1, C5(C_RGB)1, C7(C_OLED)1
1	47pF	C_0603_1608Metric	C6(Cff)1
1	470 Ohm	R_0603_1608Metric	R1(red)1
2	150 Ohm	R_0603_1608Metric	R2(green)1, R3(blue)1
1	680kOhm	R_0603_1608Metric	R4(R_top)1
1	390kOhm	R_0603_1608Metric	R5(R_bottom)1
1	C25803 R	R_0603_1608Metric	R6

Spell tome bottom design files

The KiCad project lives in the bitshiftcrazy/spell_tome repository on GitHub; these links point at the commit this page was built from.

Spell tome bottom: common questions

What microcontroller does the Spell tome bottom use?

The Spell tome bottom is built around the XIAO-RP2040-DIP, from the RP2040/RP2350 family.

How big is the Spell tome bottom PCB?

The Spell tome bottom measures 69.9 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Spell tome bottom?

25 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Spell tome bottom design files?

From the bitshiftcrazy/spell_tome repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Spell tome bottom design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which bitshiftcrazy chose for the repository.

Can I test firmware for the Spell tome bottom without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.