Tic tac toe business card

Hung-Chi970104·tic-tac-toe_business_card

About the Tic tac toe business card PCB

Tic tac toe business card is an open source RP2040/RP2350 PCB design by Hung-Chi970104, published on GitHub. It is a 2-layer board measuring 85 × 55 mm, with 77 components from 25 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the MCP1700X-330XXTT, W25Q16JVUXIQ TR and NT3H2111W0FHKH. By type, the board carries 29 resistors, 21 diodes, 16 capacitors, 4 ICs, 3 switches and 2 connectors.

It belongs with the rf & radio designs in this gallery.

From the project

Interactive RP2040 business-card PCB with a 25 × 48 mm passive NFC antenna, 18 game LEDs and minimax gameplay with alpha-beta pruning. Includes working gameplay and phone-tap demonstrations.

A playable RP2040 business card with a printed NFC antenna and a minimax computer opponent.

PCB layout · NFC design · Demos · Schematic · Design files

The layout combines a large copper-coil NFC antenna with the game interface and embedded electronics. The 18 game LEDs form nine dual-colour cells, giving each player one indicator per square; Next and Select buttons provide the controls.

Tic tac toe business card, from the project README — From the project README

Main components on the Tic tac toe business card

MCP1700X-330XXTT W25Q16JVUXIQ TR RP2040 NT3H2111W0FHKH

Tic tac toe business card bill of materials (BOM)

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

Qty	Part	Footprint	Refs
1	MCP1700X-330XXTT MCP1700x-330xxTT	SOT-23	U1
1	W25Q16JVUXIQ TR	Winbond_USON-8-1EP_3x2mm_P0.5mm_EP0.2x1.6mm	U3
1	RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U4
1	NT3H2111W0FHKH	XQFN-8_L1.6-W1.6-P0.50-BL_NT3H2111W0FHKH	U5
1	12 MHz	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	USB_C_RECEPTACLE_USB2.0_14P USB_C_Receptacle_USB2.0_14P	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1
1	CONN_01X04 Conn_01x04	PinHeader_1x04_P2.54mm_Vertical	J2
1	SW_Push	SW_Push_SPST_NO_Alps_SKRK	SW1
2	SW_Push	SW_SPST_SKQG_WithoutStem	SW2, SW3
18	LED	LED_0805_2012Metric	D1, D2, D3, D4, D5, D6, D7, D8 +10
1	LED	LED_0402_1005Metric	D13
2	LED	LED_0603_1608Metric	D17, D18
1	25X48MM_NFC_ANTENNA	25X48MM_NFC_ANTENNA	L1
9	0.1UF 0.1uF	C_0402_1005Metric	C1, C6, C7, C8, C9, C11, C12, C15 +1
2	10UF 10uF	C_0603_1608Metric	C2, C3
2	1UF 1uF	C_0402_1005Metric	C4, C14
2	15PF 15pF	C_0402_1005Metric	C13, C17
1	220NF 220nF	C_0603_1608Metric	C18
2	10K	R_0402_1005Metric	R1, R5
4	1K	R_0402_1005Metric	R2, R11, R24, R26

Show 5 more

Qty	Part	Footprint	Refs
2	5.1K	R_0402_1005Metric	R3, R4
2	27	R_0402_1005Metric	R6, R7
9	330	R_0805_2012Metric	R8, R9, R10, R12, R13, R14, R15, R16 +1
9	1k	R_0805_2012Metric	R18, R19, R20, R21, R22, R23, R27, R28 +1
1	330	R_0402_1005Metric	R25

Tic tac toe business card design files

The KiCad project lives in the Hung-Chi970104/tic-tac-toe_business_card repository on GitHub; these links point at the commit this page was built from.

LayoutTic-tac-toe_Business_Card.kicad_pcb
SchematicTic-tac-toe_Business_Card.kicad_sch
BOMproduction/bom.csv

Tic tac toe business card: common questions

What microcontroller does the Tic tac toe business card use?

The Tic tac toe business card is built around the RP2040, from the RP2040/RP2350 family.

How big is the Tic tac toe business card PCB?

The Tic tac toe business card measures 85 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Tic tac toe business card?

77 components, from 25 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 Tic tac toe business card design files?

From the Hung-Chi970104/tic-tac-toe_business_card 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 Tic tac toe business card design in my own project?

The repository has no license, so all rights stay with Hung-Chi970104. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Tic tac toe business card 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.