Opentaxus

OpenTaxus·opentaxus·hardware/pcb/OpenTaxus.kicad_pcb

About the Opentaxus PCB

Opentaxus is an open source RP2040/RP2350 PCB design by OpenTaxus, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 66.7 × 85.7 mm, with 49 components from 27 distinct parts.

Its main chip is the W25Q128JVS, from the RP2040/RP2350 family. Other key parts include the HE6206-33NR, RP2040 and XT1861B332MR-G. By type, the board carries 18 capacitors, 13 resistors, 4 ICs, 3 connectors, 3 diodes and 2 transistors.

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

From the project

Opentaxus is a permissively licensed set of hardware, software, and tooling to help as a starting point for customized conference badges.

/hardware/ contains the kicad board design files and full details about design and manufacturing. The hardware on the badge includes:

- Raspberry Pi 2040, derived from the seeed xiao 2040 - 16MB spi flash for code and files - 128x64 OLED display with SH1106 or SSD1309 controller over I2C - IR LED and Phototransistor used directly on UART. - 5-way d-pad for input - 2 neopixel LEDs - AA battery plus boost voltage converter - USB-C connector plus vreg for usb power - power switch to switch between USB and Battery power - test points for reset, boot, and swd

Main components on the Opentaxus

HE6206-33NR W25Q128JVS RP2040 XT1861B332MR-G

Opentaxus bill of materials (BOM)

49 components, 27 distinct parts.

Qty	Part	Footprint	Refs
1	HE6206-33NR	SOT-23-3	U1
1	W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U2
1	RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U3
1	XT1861B332MR-G	SOT-23	U4
1	BC847BS	SOT-363_SC-70-6	Q2
1	PT12-21B/TR8	PT12-21B-TR8	Q3
1	YSX321SL	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	OLED	PinHeader_1x04_P2.54mm_Vertical	J1
1	qwiic	JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal	J2
1	USB_C_Receptacle_USB2.0	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J4
1	AA	BatteryHolder_Keystone_2460_1xAA	BT2
1	dpad	10x10x10x9-6P-WX	SW1
1	SW_SPDT	SW_SPDT_PCM12	SW4
2	WS2812B	LED_WS2812B_PLCC4_1.0x1.0mm	D1, D2
1	IR12-21C/TR8	IR12-21C-TR8	D3
1	600R	L_0402_1005Metric	FB1
1	10u	L_1008_2520Metric	L1
2	22p	C_0402_1005Metric	C1, C2
5	10u	C_0402_1005Metric	C3, C8, C10, C16, C22
10	100n	C_0402_1005Metric	C4, C6, C7, C9, C11, C12, C13, C14 +2

Show 7 more

Qty	Part	Footprint	Refs
1	47u	C_0805_2012Metric	C5
4	1k	R_0402_1005Metric	R1, R3, R11, R13
2	27	R_0402_1005Metric	R4, R5
1	1M	R_0402_1005Metric	R6
2	5k1	R_0402_1005Metric	R7, R8
2	200k	R_0402_1005Metric	R9, R10
2	220	R_0402_1005Metric	R12, R14

Opentaxus design files

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

Layouthardware/pcb/OpenTaxus.kicad_pcb
Schematichardware/pcb/OpenTaxus.kicad_sch

Opentaxus: common questions

What microcontroller does the Opentaxus use?

The Opentaxus is built around the W25Q128JVS, from the RP2040/RP2350 family.

How big is the Opentaxus PCB?

The Opentaxus measures 66.7 × 85.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Opentaxus?

49 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the Opentaxus design files?

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

Can I use the Opentaxus design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which OpenTaxus chose for the repository.

Can I test firmware for the Opentaxus 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.