2 layers36 × 45.8 mm
Xiaomao
tigard-tools/xiaomao
Xiǎomāo is a development board geared toward hardware hacking and hardware implant design that can safely interfacing with a wide range of logic levels
84 parts37CERN-OHL-S-2.0
2 layers66.7 × 85.7 mm
Opentaxus
OpenTaxus/opentaxus19Opentaxus is a permissively licensed set of hardware, software, and tooling to help as a starting point for customized conference badges.
- Size
- 66.7 × 85.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 54
- Nets
- 65
- Pads
- 232
- Tracks, vias
- 436, 29
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 Jun 2024
- Updated
- 20 May 2025
Overview
Opentaxus is an open-source printed circuit board by OpenTaxus, from the OpenTaxus/opentaxus repository on GitHub. It is a 2-layer board of 66.7 × 85.7 mm with 54 parts on 65 nets, routed with 436 tracks and 29 vias.
It is built around the RP2040, W25Q128JVSIQ and XT1861B332MR-G, with the HE6206-33NR, WS2812B and BC847BS among its other parts. Its parts include 18 capacitors, 15 resistors, 4 ICs, 4 connectors and 4 switches. It belongs with the lEDs and displays boards and the RP2040 boards of this library.
Main components
9
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
XT1861B332MR-G
SOT-23-3L-40℃~+85℃ 1 15uA 3.3V 300kHz 300mA 900mV~6.5V Boost Boost Built-in Fixed Yes SOT-23-3L DC-DC Converters ROHSNATLINEARDC-DC Converters
HE6206-33NR
SOT-23-40℃~+85℃ 1 190mV@(100mA) 3.3V 300mA 30uVrms 50dB@(1kHz) 5uA 8V Fixed Over Current Protection、Short Circuit Protection Positive SOT-23 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHEERMICRVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
BC847BS
SOT-363Bipolar (BJT)hongjiacheng
IR12-21C/TR8
SMD,3x2mm-25℃~+85℃ 0.5mW/sr@IF=20mA 1.2V 130mW 5V 65mA 940nm SMD,3x2mm Infrared LED Emitters ROHSEverlight ElectronicsInfrared LED Emitters
PT12-21B/TR8
SMD-3P,3x1mm-25℃~+85℃ 0.4V@2mA 100nA 30V 50mA 75mW 940nm NPN SMD-3P,3x1mm Phototransistors ROHSEverlight ElectronicsPhototransistors
YSX321SL
SMD3225-4PSMD3225-4P New Arrivals ROHSYXCUncategorised
README
hardware/pcb/README.mdHardware
/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
Parts
54| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100n | Capacitor_SMD:C_0402_1005Metric | C4, C6, C7, C9, C11, C12, C13, C14, C15, C19 |
| 5 | 10u | Capacitor_SMD:C_0402_1005Metric | C3, C8, C10, C16, C22 |
| 4 | 1k | Resistor_SMD:R_0402_1005Metric | R1, R3, R11, R13 |
| 2 | 200k | Resistor_SMD:R_0402_1005Metric | R9, R10 |
| 2 | 220 | Resistor_SMD:R_0402_1005Metric | R12, R14 |
| 2 | 22p | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | DNP | Resistor_SMD:R_0402_1005Metric | R2, R15 |
| 2 | WS2812B | ws2812b:LED_WS2812B_PLCC4_1.0x1.0mm | D1, D2 |
| 1 | 10u | Inductor_SMD:L_1008_2520Metric | L1 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 47u | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 600R | Inductor_SMD:L_0402_1005Metric | FB1 |
| 1 | AA | Battery:BatteryHolder_Keystone_2460_1xAA | BT2 |
| 1 | BC847BS | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q2 |
| 1 | HE6206-33NR | Package_TO_SOT_SMD:SOT-23-3 | U1 |
| 1 | IR12-21C/TR8 | ir:IR12-21C-TR8 | D3 |
| 1 | OLED | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | PT12-21B/TR8 | ir:PT12-21B-TR8 | Q3 |
| 1 | RESET | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | SW3 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U3 |
| 1 | SWD | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | J3 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_PCM12 | SW4 |
| 1 | USB_BOOT | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | SW2 |
| 1 | USB_C_Receptacle_USB2.0 | usbc:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J4 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U2 |
| 1 | XT1861B332MR-G | Package_TO_SOT_SMD:SOT-23 | U4 |
| 1 | YSX321SL | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | dpad | dpad:10x10x10x9-6P-WX | SW1 |
| 1 | qwiic | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J2 |
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Questions
How big is the Opentaxus PCB?
It measures 66.7 × 85.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Opentaxus use?
54 parts, built around the RP2040, W25Q128JVSIQ, XT1861B332MR-G and HE6206-33NR. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Opentaxus KiCad files?
From the OpenTaxus/opentaxus repository on GitHub, at the commit this page was made from: the board is hardware/pcb/OpenTaxus.kicad_pcb and its schematic hardware/pcb/OpenTaxus.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Opentaxus design in my own project?
Its repository states no licence, so its author keeps all rights: ask OpenTaxus before reusing the design.