4 layers35.4 × 90.9 mm
RP2350 80QFN minimal
Sphyrna-029/Yet-Another-Rocket-Computer
YARC (Yet Another Rocket Comptuer). Rocket flight computers are all the craze nowa-days. This is my attempt at one.
51 parts
4 layers65 × 56.5 mm
MeshHat
kevinlutzer/MeshHatMeshtastic or Meshcore supported Raspberry Pi Hat
- Size
- 65 × 56.5 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 38
- Nets
- 78
- Pads
- 219
- Tracks, vias
- 357, 72
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 8 Apr 2026
- Updated
- 4 Jun 2026
Overview
MeshHat is an open-source printed circuit board by kevinlutzer, from the kevinlutzer/MeshHat repository on GitHub, published under the MIT licence. It is a 4-layer board of 65 × 56.5 mm with 38 parts on 78 nets, routed with 357 tracks and 72 vias.
It is built around the RP2040, E22-900M30S and W25Q128JVSIQ, with the CAT24C128LI- and ABM8-272-T3 among its other parts. Its parts include 18 capacitors, 9 resistors, 4 ICs, 3 connectors and 2 switches. It belongs with the radio and wireless boards and the RP2040 boards of this library.
Main components
5
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
E22-900M30S
SMD,38.5x24mm-151dBm 12km 14mA 2.5V~5.5V 31dBm 650mA Continuous frequency coverage IPEX interface LoRa SPI SMD,38.5x24mm LoRa Modules ROHSChengdu Ebyte Elec TechLoRa Modules
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
CAT24C128LI-
PDIP-8-40℃~+85℃ 1,000,000 cycles 1.8V~5.5V 100 Years 128Kbit 1MHz 5ms I2C Noise suppression function、Power-down/Power-up protection circuit PDIP-8 EEPROM ROHSonsemiEEPROM
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
README
README.mdMeshHat
A standard Raspberry Pi HAT with everything needed to run MeshCore or Meshtastic — right out of the box.
Overview
MeshHat is a Raspberry Pi HAT (Hardware Attached on Top) that integrates all the components required to join or extend a LoRa mesh network. Whether you're building an internet gateway, running automations, or deploying a remote node, MeshHat gives you a single-board solution with no additional wiring.
Features
| Component | Details |
|---|---|
| LoRa Module | E22P — 1W output power |
| Radio Driver MCU | RP2040 |
| Programming Interface | SWD connector (for RP2040 firmware updates) |
| Host Interface | UART0 (Raspberry Pi ↔ RP2040) |
| Remote Flashing | SWD lines routed to Raspberry Pi GPIO |
How It Works
Communication between the RP2040 (which handles radio duties) and the Raspberry Pi host runs over UART0. The RP2040 can also be reflashed remotely via the SWD lines connected to the Pi — no physical access to the board required for firmware updates.
Example Applications
- Internet Gateway — Bridge a LoRa mesh network to the internet
- Mesh Automations — Trigger actions based on mesh messages or node events
- Remote Sensor Node — Deploy a standalone, Pi-powered mesh node
Compatible Firmware
Getting Started
⚠️ Documentation in progress. Pinout diagrams, setup guides, and firmware flashing instructions coming soon.
Contributing
Pull requests and issue reports are welcome. If you've built something with MeshHat, we'd love to hear about it.
License
To be specified.
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 0U1 | Capacitor_SMD:C_0603_1608Metric | C1, C5, C6, C8, C9, C10, C11, C12, C13, C14, C15, C16, C18 |
| 3 | 1U | Capacitor_SMD:C_0603_1608Metric | C4, C7, C17 |
| 2 | 0 | Resistor_SMD:R_0603_1608Metric | R8, R9 |
| 2 | 10K | Resistor_SMD:R_0603_1608Metric | R3, R7 |
| 2 | 15P | Capacitor_SMD:C_0603_1608Metric | C2, C3 |
| 2 | 27.4 | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 2K2 | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | SW_SPST | Button_Switch_SMD:SW_Push_1P1T_NO_CK_KMR2 | SW1, SW2 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | ABM8-272-T3 | Crystal:Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm | Y1 |
| 1 | CAT24C128 | Package_SO:TSSOP-8_4.4x3mm_P0.65mm | U3 |
| 1 | Conn_01x03_Socket | Connector_JST:JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J3 |
| 1 | E22-900M30S | E22P:XCVR_E22-900M30S | U1 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U5 |
| 1 | RPi_GPIO | RPi_Hat:RPI_Hat_B+ | J1 |
| 1 | USB_B_Mini | Connector_USB:USB_Mini-B_AdamTech_MUSB-B5-S-VT-TSMT-1_SMD_Vertical | J2 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U6 |
The 37 most common of 38 parts.
Questions
How big is the MeshHat PCB?
It measures 65 × 56.5 mm and has 4 copper layers, 1.61 mm thick.
What parts does the MeshHat use?
38 parts, built around the RP2040, E22-900M30S, W25Q128JVSIQ and CAT24C128LI-. 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 MeshHat KiCad files?
From the kevinlutzer/MeshHat repository on GitHub, at the commit this page was made from: the board is MeshHat.kicad_pcb and its schematic MeshHat.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MeshHat design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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