2 layers60 × 75 mm
UBike
nategreco/uBike
The Universal Bike Controller is an open-source project aimed at providing a drop-in replacement for the factory console on NordicTrack® S-series exercise bikes
53 parts22GPL-3.0
2 layers62 × 208.5 mm
Combined
wr/airwriter7Print to vintage Apple printers from modern devices over AirPrint, or from a vintage Mac over AppleTalk.
- Size
- 62 × 208.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 154
- Nets
- 119
- Pads
- 513
- Tracks, vias
- 981, 122
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 16 Oct 2026
- Updated
- 7 Nov 2026
Overview
Combined is an open-source printed circuit board by wr, from the wr/airwriter repository on GitHub. It is a 2-layer board of 62 × 208.5 mm with 154 parts on 119 nets, routed with 981 tracks and 122 vias.
It is built around the PIC12F1840-I/P, SP3485EN-L/TR and ESP32-S3-WROOM-1-N16R8, with the SP3232EBEN-L/TR, THVD1451DRBR and AP7361C-33E among its other parts. Its parts include 57 capacitors, 38 diodes, 24 resistors, 9 ICs and 3 connectors. It belongs with the retro computing and games boards and the ESP32 and PIC boards of this library.
Main components
12
PIC12F1840-I/P
PDIP-8-40℃~+85℃ 10bit 2.3V~5.5V 256Byte 256Byte 32MHz 5 5bit 7KB 8 Bit Built-in FLASH PIC PDIP-8 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
SP3485EN-L/TR
SOIC-8-40℃~+85℃ 1 1 10Mbps 2mA 3.3V 32 Half-Duplex Transceiver SOIC-8 RS-485 / RS-422 ICs ROHSMaxLinearRS-485 / RS-422 ICs
ESP32-S3-WROOM-1-N16R8
SMD,25.5x18mm-103.5dBm -40℃~+65℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA ESP32-S3R8 On-board PCB Antenna UART、SPI、I2C、GPIO、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
SP3232EBEN-L/TR
SOIC-16-40℃~+85℃ 0.3mA 2 2 250Kbps 3V~5.5V Transceiver Yes ±15kV SOIC-16 RS232 ICs ROHSMaxLinearRS232 ICs
THVD1451DRBR
VSON-8(3x3)-40℃~+125℃ 1 1 256 3V~5.5V 3mA 50Mbps Full-Duplex Transceiver ±30kV VSON-8(3x3) RS-485 / RS-422 ICs ROHSTexas InstrumentsRS-485 / RS-422 ICs
AP7361C-33E
SOT-223-40℃~+85℃@(Ta) 1 1A 3.3V 340mV@(1A) 6V 75dB@(1kHz) 80uA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SN74LV1T125DCKR-TP
SOT-353-40℃~+125℃ 1 1 1.6V~5.5V 1.6V~5.5V Level translator Power-off protection、Output enable high-impedance Tri-State Unidirectional SOT-353 Translators, Level Shifters ROHSTECH PUBLICTranslators, Level Shifters
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
SK6812MINI-C
SMD-4P,3.7x3.5mm-40℃~+85℃ 0.65mA 1.1mm 11.6ns 120° 160mcd~320mcd 1kHz 2000V 280mcd~515mcd 3.5mm 3.7V~5.5V 3.7mm 460nm~470nm 520nm~530nm 615nm~625nm 800Kbit/s 815mcd~1275mcd 82ns 9.6ns Built-in power-on reset circuit、Built-in power-on reset circuit、Built-in one-way transmission function SMD-4P,3.7x3.5mm RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
B3U-1000P
SMD,3x2.5mm-25℃~+70℃ 1.53N 1.6mm 12V 2.5mm 3mm 50mA Round Button SMD(SMT) Tab SPST Surface Mount,Vertical SMD,3x2.5mm Tactile Switches ROHSOmronTactile SwitchesKMDGX-8S-BS
插件-25℃~+80℃ 2A 8P Copper alloy Female Gold 插件 Circular Connectors & Cable Connectors ROHSKyconCircular Connectors & Cable Connectors
TS-1002-BR15026
插件-4P,6x6mm-30℃~+80℃ 100,000 cycles 12V 15mm 2.6N 50mA 6mm 6mm Black PC Pin Round Button SPST Through Hole Without Bracket 插件-4P,6x6mm Tactile Switches ROHSXUNPUTactile Switches
README
README.mdAirWriter
AirPrint for your vintage Apple printer.
Print from your phone or computer to an Apple ImageWriter, StyleWriter or LaserWriter. Connect AirWriter to the printer and your Wi-Fi, and the printer shows up like any other. Nothing to install.
The top is a gold-plated circuit board with 37 lights glowing through it. A rainbow sweeps across when it starts up, and a few dots glow like fireflies while it's idle.
- Five-minute setup. All from your phone.
- Color. If your printer does color, so does AirWriter.
- Vintage Macs too. Print from a vintage Mac over a LocalTalk cable or your network, or from an emulator like Infinite Mac.
- Up to six printers. One AirWriter shares them all.
- Open source. Hardware and software, free to tinker with.
Buy one from Wells Workshop.
What you need
- A vintage Apple printer (check yours)
- The cable your printer uses with a Mac (which cable)
- A USB-C charger
- 2.4 GHz Wi-Fi
The wiki has setup help and troubleshooting. Updates install over Wi-Fi.
How it works
Inside is an ESP32-S3. It shows each printer to your network as an AirPrint printer. Each page goes out in the printer's own language, down the printer cable or over AppleTalk. LocalTalk runs on Tashtari's TashTalk, on a small PIC chip.
| Path | Contents |
|---|---|
firmware/ | ESP-IDF application (ESP32-S3) |
tools/ | Host builds of the raster and IPP code, tests, fixtures and the settings page |
hardware/ | KiCad board and front panel |
enclosure/ | Case and light-guide lattice in build123d, with printable STLs in out/ |
Firmware builds with ESP-IDF 5.5 (idf.py -C firmware build). Host tests run anywhere with a C
compiler: make -C tools/rip test regress and make -C tools/ipp test. AGENTS.md has the full
toolchain notes.
Credits
LocalTalk runs on Tashtari's TashTalk. Monroe Williams worked out the StyleWriter's serial protocol in the 1990s and wrote lpstyl. FeralFirmware took Apple's StyleWriter drivers apart for TailTalk and InkTalk. Thank you all.
License
Firmware and tools are GPL-3.0-or-later, hardware and enclosure CERN-OHL-S-2.0, docs CC-BY-SA-4.0.
See LICENSE.md, which also covers third-party material.
Parts
154| Qty | Value | Footprint | References |
|---|---|---|---|
| 49 | 100n | Capacitor_SMD:C_0603_1608Metric | C3, C10, C11, C12, C13, C14, C16, C17, C18, C29, C30, C31, C32, C33, C34, C35 +33 |
| 37 | SK6812MINI-C | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25 +21 |
| 9 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R14, R21, R22, R23, R24, R25, R32, R33 |
| 4 | 10R | Resistor_SMD:R_0603_1608Metric | R10, R11, R12, R13 |
| 4 | 9774030151R | panel:SMT_Standoff_M2.5_D6.0mm | MT1, MT2, MT3, MT4 |
| 4 | MountingHole_2.2mm_M2 | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 22u | Capacitor_SMD:C_0805_2012Metric | C1, C21, C22 |
| 2 | 0R | Resistor_SMD:R_0603_1608Metric | R8, R9 |
| 2 | 100R | Resistor_SMD:R_0603_1608Metric | R15, R16 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric | C2, C4 |
| 2 | 15k | Resistor_SMD:R_0603_1608Metric | R29, R30 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | SP3485EN-L | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U6, U8 |
| 1 | H_TEST | ||
| 1 | +3V3 | TestPoint_Pad_D1.0mm | TP2 |
| 1 | 150R | Resistor_SMD:R_0603_1608Metric | R17 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R27 |
| 1 | 1n | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 1u | Capacitor_SMD:C_0805_2012Metric | C67 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 47R | Resistor_SMD:R_0603_1608Metric | R20 |
| 1 | AP7361C-33E | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | B3U-1000P | Button_Switch_SMD:SW_SPST_B3U-1000P | SW2 |
| 1 | EN | TestPoint_Pad_D1.0mm | TP4 |
| 1 | ESP32-S3-WROOM-1-N16R8 | RF_Module:ESP32-S3-WROOM-1 | U1 |
| 1 | GND | TestPoint_Pad_D1.0mm | TP9 |
| 1 | LC | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | LED_DATA5 | TestPoint_Pad_D1.0mm | TP5 |
| 1 | Mini-DIN-8 LocalTalk | airwriter:MiniDIN-8_Kycon_KMDGX-8S-BS_RightAngle | J4 |
| 1 | Mini-DIN-8 to printer | airwriter:MiniDIN-8_Kycon_KMDGX-8S-BS_RightAngle | J2 |
| 1 | OSHW-Logo_7.5x8mm_SilkScreen | Symbol:OSHW-Logo_7.5x8mm_SilkScreen | LOGO1 |
| 1 | PIC12F1840-I/P | Package_DIP:DIP-8_W7.62mm_Socket | U7 |
| 1 | RXD0 | TestPoint_Pad_D1.0mm | TP8 |
| 1 | SN74LV1T125DCKR | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U9 |
| 1 | SP3232EBEN-L/TR | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | SPARE_IO38 | SparePad_D1.0mm | TP10 |
| 1 | SPARE_IO39 | SparePad_D1.0mm | TP11 |
| 1 | SPARE_IO40 | SparePad_D1.0mm | TP12 |
| 1 | THVD1451DR | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | TS-1002-BR15026 | Button_Switch_THT:SW_PUSH_6mm_H13mm | SW3 |
| 1 | TSB001A3518A | airwriter:SW_BZCN_TSB001A3518A | SW1 |
| 1 | TXD0 | TestPoint_Pad_D1.0mm | TP7 |
| 1 | USB-C 5V in | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | green PWR | airwriter:LED_D3.0mm_Spacer_H8mm | D3 |
Questions
How big is the Combined PCB?
It measures 62 × 208.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Combined use?
154 parts, built around the PIC12F1840-I/P, SP3485EN-L/TR, ESP32-S3-WROOM-1-N16R8 and SP3232EBEN-L/TR. 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 Combined KiCad files?
From the wr/airwriter repository on GitHub, at the commit this page was made from: the board is hardware/combined/combined.kicad_pcb and its schematic hardware/airwriter/airwriter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Combined design in my own project?
Its repository states no licence, so its author keeps all rights: ask wr before reusing the design.
Similar boards
- 2 layers135.6 × 80.8 mm
Quadcopter
pschilkdev/QuadCopter_PP
Main Repository for all code for the Quadcopter Project. Personal Project 2015/16 IICS
155 partsMIT - 4 layers65 × 56 mm
- 2 layers80 × 54 mm
Pl60c dmx
tsmiltonAgents/pl60c-dmx-wakeup
A small ESP32-S3 board that drives the wired DMX512 input of a Neewer PL60C panel light so the light can be ramped up slowly in the morning (sunrise alarm). Rev A, 2026-09-02.
40 parts - 4 layers31.5 × 76.5 mm
Pico2w usbc header board
gjberger/pico2-starter
Bare-metal C on the Raspberry Pi Pico 2 (RISC-V), no SDK: linker script, minimal lib, UART loader
44 parts - 2 layers348.8 × 118.7 mm
TKL VOLT80
Jubakuba/Volt-80-Kicad
This PCB can be purchased and assembled by JLCPCB or other services. You can have them assemble hotswap socket of your choice or order them and solder them yourself.
202 parts - 4 layers118 × 100 mm
- 4 layers45 × 80 mm
