Spelltwister

LucasLHenry·spelltwister·hardware design/dsug_cctv_BOARD.kicad_pcb

About the Spelltwister PCB

Spelltwister is an open source RP2040/RP2350 PCB design by LucasLHenry, published on GitHub under the MIT license. It is a 2-layer board measuring 120 × 102.5 mm, with 251 components from 45 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the AMS1117-3.3, W25Q128JVS, CD4051B, TL074 and MCP6004. By type, the board carries 101 resistors, 66 capacitors, 25 diodes, 20 connectors, 16 ICs and 5 switches.

From the project

This is the third version of the code for the Spelltwister module with CCTV. This version uses the Arduino platform and the RP2040, a chip developed by Raspberry Pi for their RPi Pico board.

The three knobs are Time, Shape, and Ratio. Time controls the overall time for one cycle of the waveform, so also functions as pitch in VCO mode. Ratio controls the ratio between the time spent on the first stage versus the second stage (so ratio set fully CCW would mean that all time is spent falling, which would form a downwards saw wave). Lastly, Shape controls the curvature of the rising and falling, from exponential to logarithmic. With Shape in it's center position, the slope is linear, but turning it below 12 o'clock makes the rising and falling more exponential, while turning it the…

Main components on the Spelltwister

AMS1117-3.3 W25Q128JVS CD4051B TL074 MCP6004LM4040DIM3-10.0/NOPBRP2040 AP63205WU 74AHCT1G125

Spelltwister bill of materials (BOM)

251 components, 45 distinct parts.

Qty	Part	Footprint	Refs
2	AMS1117-3.3	SOT-223-3_TabPin2	U1, U3
1	W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U2
2	CD4051B	SOIC-16_3.9x9.9mm_P1.27mm	U4, U6
4	TL074	SOIC-14_3.9x8.7mm_P1.27mm	U5, U9, U12, U14
3	MCP6004	SOIC-14_3.9x8.7mm_P1.27mm	U7, U10, U11
1	LM4040DIM3-10.0/NOPB	SOT-23	U8
1	RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U13
1	AP63205WU	TSOT-23-6	U15
1	74AHCT1G125	SOT-353_SC-70-5	U16
2	MMBT3904	SOT-23	Q3, Q4
1	Crystal_GND24	ABM8-272-T3_ABR	Y1
1	Conn_02x05_Top_Bottom	PinHeader_2x05_P2.54mm_Vertical	J1
18	JACK	AudioJack_3.5mm_with_drawing	J2, J4, J5, J6, J7, J8, J9, J10 +10
1	TYPEC-304-ACP16	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J3
8	10k	Potentiometer_RV09_talltrimmer	RV1, RV2, RV3, RV6, RV7, RV8, RV10, RV14
6	10k	Potentiometer_RV09_6mm_knob	RV4, RV5, RV9, RV11, RV12, RV13
1	TS-1187A-B-A-B	push_switch_5.1x5.1	SW1
1	24_detent	RotaryEncoder_Switch_Vertical_H20mm_20mm_knob	SW2
1	SW_Push	SW_PUSH_6mm	SW3
2	SW_SPDT_MSM	SPDT_P2.54mm_Vertical	SW4, SW5

Show 25 more

Qty	Part	Footprint	Refs
2	1N4148	D_SOD-123	D1, D2
23	SK6812MINI-E	SK6812MINIE	D3, D4, D5, D6, D7, D8, D9, D10 +15
1	4.7uH	L_TaiTech_HPC3010TF-4R7M	L1
6	22uF	CP_Radial_D5.0mm_P2.50mm	C1, C2, C7, C55, C56, C57
32	100nF	C_0603_1608Metric	C3, C4, C5, C6, C8, C12, C13, C14 +24
14	1nF	C_0603_1608Metric	C9, C18, C20, C21, C28, C29, C30, C32 +6
2	15pF	C_0603_1608Metric	C10, C11
2	10nF	C_0603_1608Metric	C22, C23
6	2.2nF	C_0603_1608Metric	C31, C33, C35, C48, C50, C52
4	1uF	C_0603_1608Metric	C45, C47, C60, C62
10	1k	R_0603_1608Metric	R1, R8, R9, R44, R54, R55, R79, R92 +2
31	10k	R_0603_1608Metric	R2, R12, R13, R16, R17, R24, R25, R26 +23
2	1M	R_0603_1608Metric	R3, R30
2	470k	R_0603_1608Metric	R4, R53
10	120k	R_0603_1608Metric	R5, R18, R20, R27, R36, R60, R62, R64 +2
14	100k	R_0603_1608Metric	R6, R14, R15, R19, R21, R28, R34, R35 +6
8	22k	R_0603_1608Metric	R7, R22, R23, R29, R68, R69, R76, R97
2	5k1	R_0603_1608Metric	R10, R11
4	180k	R_0603_1608Metric	R33, R38, R58, R66
2	270k	R_0603_1608Metric	R37, R65
2	47k	R_0603_1608Metric	R39, R67
4	56k	R_0603_1608Metric	R48, R82, R83, R101
4	39k	R_0603_1608Metric	R51, R52, R89, R90
4	4.7k	R_0603_1608Metric	R84, R85, R102, R103
2	27R	R_0603_1608Metric	R104, R105

Spelltwister design files

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

Layouthardware design/dsug_cctv_BOARD.kicad_pcb
Schematichardware design/dsug_cctv_BOARD.kicad_sch

Spelltwister: common questions

What microcontroller does the Spelltwister use?

The Spelltwister is built around the RP2040, from the RP2040/RP2350 family.

How big is the Spelltwister PCB?

The Spelltwister measures 120 × 102.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Spelltwister?

251 components, from 45 distinct parts. The full bill of materials is listed on this page.

Where can I download the Spelltwister design files?

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

Can I use the Spelltwister design in my own project?

Yes, under the terms of its MIT license, which LucasLHenry chose for the repository.

Can I test firmware for the Spelltwister 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.