2 layers78 × 60 mm
4 layers65 × 30 mm
Faux pi-0
DLehenbauer/faux-pi-zero4RP2040 dev board in a Raspberry Pi Zero compatible form factor. Includes DVI and SD Card.
- Size
- 65 × 30 mm
- Copper layers
- 4
- Thickness
- 1.65 mm
- Parts
- 63
- Nets
- 78
- Pads
- 294
- Tracks, vias
- 1,243, 111
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 6 Dec 2022
- Updated
- 25 May 2024
Overview
Faux pi-0 is an open-source printed circuit board by DLehenbauer, from the DLehenbauer/faux-pi-zero repository on GitHub. It is a 4-layer board of 65 × 30 mm with 63 parts on 78 nets, routed with 1,243 tracks and 111 vias.
It is built around the RP2040, W25Q128JVSIQ and AMS1117-3.3. Its parts include 22 resistors, 17 capacitors, 7 connectors, 3 ICs and 2 diodes. It belongs with the microcontroller boards and interfaces and adapters boards and the RP2040 boards of this library.
Main components
3
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
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdFaux Pi Zero
Open hardware RP2040 dev board in a Raspberry Pi Zero compatible form factor. Includes Mini HDMI (via bitbanged DVI) and microSD.
Description
This board aids with migrating a project from the Pi Zero to the RP2040 while retaining the option of moving back to the Pi Zero in the future. It has the same footprint as the Pi Zero and a partially compatible pinout, making it convenient to support both the RP2040 and Pi Zero in the same design.
Status
Works, but 1 of 2 boards received by JLCPCB had a solder bridge on the RP2040. Looking at JLCPCB's EasyEDA footprints, it looks like JLCPCB used longer pads for the RP2040. I'd recommend using a custom footprint and extending the pads, which hopefully will avoid defects.
A couple other things I'd change in retrospect:
- Expose UART TX/RX on the debug header and reorder pins so you can plug a picoprobe into the board w/o wires.
- Remove the hacky activity LED from the microSD since the lib already blinks GP25.
- Try for a 2 layer board to reduce cost
- Reduce buttons to 6 x 3.5 and maybe try to squeeze in an optional wireless module
DVI and microSD both appear to work with a basic test. I've exercised DVI, USB (host), SPI1, and the debug header quite a bit (all good). Other functionality is either lightly tested or untested.
Features
- Compatible footprint:
- Mini HDMI (via bitbanged DVI)
- Micro SD (via SPI mode. Cards must be <2TB)
- Micro USB
- Power (via Micro USB)
- Partially compatible pinout
- 16MB Flash
- Green status LED on GP25 (same as Pico)
- Red SD activity LED on GP9
- BOOTSEL and RESET buttons
- SWD Header
Pinout
See schematic for more details.
Mapping from Pi Zero to Faux Px Zero
| Pi Pin | Pico Pin | Pi GPIO | Pico GP | Function | Notes |
|---|---|---|---|---|---|
| 1, 17 | 36 | 3V3 (Out) | |||
| 2, 4 | 39 | VSYS | |||
| 2, 4 | 40 | VBUS | |||
| 3 | 4 | GPIO 02 | GP 02 | I2C_SDA | |
| 5 | 5 | GPIO 03 | GP 03 | I2C_SCL | |
| 6, 9, 14, 20, 25, 30, 34, 39 | 3, 8, 13, 18, 23, 28, 33, 38, DBG-2 | GND | |||
| 7 | GPIO 04 | GP 24 | |||
| 8 | 1 | GPIO 14 | GP 00 | UART0 TX | |
| 10 | 2 | GPIO 15 | GP 01 | UART0 RX | |
| 11 | 12 | GPIO 17 | GP 09 | SD_CSn | Can be used as GP with SD card removed. Note 10k pullup. |
| 12 | 17 | GPIO 18 | GP 13 | SPI1_CSn | Can be used to share SPI1 with SD card. |
| 13 | 11 | GPIO 27 | GP 08 | SD_DET | Can be used as GP with SD card removed. |
| 15 | 14 | GPIO 22 | GP 10 | DVI_CEC | DVI_CEC when JP3 closed. See schematic. |
| 16 | 15 | GPIO 23 | GP 11 | ||
| 18 | DBG-3 | GPIO 24 | SWD | ||
| 19 | 6/10 | GPIO 10 | GP 04/07 | SPI0_RX/TX | Select controller or peripheral via JP1 and JP2. See schematic. |
| 21 | 10/6 | GPIO 09 | GP 07/04 | SPI0_TX/RX | Select controller or peripheral via JP1 and JP2. See schematic. |
| 22 | DBG-1 | GPIO 25 | SWCLK | ||
| 23 | 9 | GPIO 11 | GP 06 | SPI0_SCLK | |
| 24 | 7 | GPIO 08 | GP 05 | SPI0_CSn | |
| 26 | GPIO 07 | ||||
| 27 | 34 | GPIO 00 | GP 28 | I2C_SCL | DVI_SDA when JP4 closed. See schematic. |
| 28 | GPIO 01 | GP 29 | |||
| 29 | 31 | GPIO 05 | GP 26 | ||
| 31 | 32 | GPIO 06 | GP 27 | I2C_SDA | DVI_SDA when JP5 closed. See schematic. |
| 32 | GPIO 12 | ||||
| 33 | GPIO 13 | ||||
| 35 | 16 | GPIO 19 | GP 12 | SPI1_RX / SD_DAT | Can be used as GP with SD card removed. Note 10k pullup. |
| 36 | GPIO 16 | BOOTSEL | |||
| 37 | 30 | GPIO 26 | RUN | ||
| 38 | 20 | GPIO 20 | GP 15 | SPI1_TX / SD_CMD | Can be used as GP with SD card removed. |
| 40 | 19 | GPIO 21 | GP 14 | SPI1_SCLK / SD_CLK | Can be used as GP with SD card removed. |
| GP 23 | DVI_D2+ | ||||
| 21 | GP 16 | DVI_CK- | |||
| 22 | GP 17 | DVI_CK+ | |||
| 24 | GP 18 | DVI_D0- | |||
| 25 | GP 19 | DVI_D0+ | |||
| 26 | GP 20 | DVI_D1- | |||
| 27 | GP 21 | DVI_D1+ | |||
| 29 | GP 22 | DVI_D2- | |||
| 35 | N/C | ||||
| 37 | 3V3_EN | ||||
| LED | GP 25 |
Schematic
(Click image to view PDF)
Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100n | Capacitor_SMD:C_0402_1005Metric | C7, C8, C9, C10, C11, C12, C15, C16, C17, C18 |
| 10 | 270 | Resistor_SMD:R_0603_1608Metric | R6, R7, R8, R9, R11, R12, R13, R14, R15, R23 |
| 4 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R10, R19 |
| 4 | MountingHole_2.7mm_M2.5 | MountingHole:MountingHole_2.7mm_M2.5 | MH1, MH2, MH3, MH4 |
| 3 | 2k2 | Resistor_SMD:R_0402_1005Metric | R18, R21, R22 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R5, R20 |
| 2 | 2.2u | Capacitor_SMD:C_0402_1005Metric | C13, C19 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C4, C5 |
| 2 | 27 | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 30p | Capacitor_SMD:C_0402_1005Metric | C1, C2 |
| 1 | 10u | Capacitor_SMD:C_0402_1005Metric | C14 |
| 1 | 12 MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 470 | Resistor_SMD:R_0402_1005Metric | R17 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | BOOTSEL | Button_Switch_THT:SW_PUSH_6mm | SW2 |
| 1 | DEBUG | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | DVI_CEC | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | DVI_SCL | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP4 |
| 1 | DVI_SDA | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP5 |
| 1 | GPIO | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J8 |
| 1 | HDMI_C_1.4 | JLCPCB:HDMI-SMD_HDMI-201 | J6 |
| 1 | Micro_SD_Card_Det | JLCPCB:SIM-SMD_8P-1040310811 | J9 |
| 1 | PWR_IN | JLCPCB:MICRO-USB_MICRO-USB-17 | J1 |
| 1 | RESET | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm_ThermalVias | U1 |
| 1 | RUN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | SD_RED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | SPI0_PICO | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | SPI0_POCI | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | STS_GRN | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | USB | JLCPCB:MICRO-USB_MICRO-USB-17 | J10 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U3 |
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Questions
How big is the Faux pi-0 PCB?
It measures 65 × 30 mm and has 4 copper layers, 1.65 mm thick.
What parts does the Faux pi-0 use?
63 parts, built around the RP2040, W25Q128JVSIQ and AMS1117-3.3. 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 Faux pi-0 KiCad files?
From the DLehenbauer/faux-pi-zero repository on GitHub, at the commit this page was made from: the board is hw/faux-pi-0.kicad_pcb and its schematic hw/faux-pi-0.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Faux pi-0 design in my own project?
Its repository states no licence, so its author keeps all rights: ask DLehenbauer before reusing the design.