Mainboard
About the Mainboard PCB
Mainboard is an open source RP2040/RP2350 PCB design by pete4radio, published on GitHub. It is a 4-layer board measuring 90.2 × 95.9 mm, with 175 components from 72 distinct parts.
Its main chip is the RP2350_80QFN, from the RP2040/RP2350 family. Other key parts include the W25Q80DVSNIG, ADM1176-1ARMZ-R7, TPS54226PWPR, lt3652hvimse#pbf and TLV1704. By type, the board carries 70 resistors, 51 capacitors, 22 connectors, 10 ICs, 7 diodes and 5 transistors.
From the project
SAMWISE boards existing or newly ordered March 2025
Main components on the Mainboard
Mainboard bill of materials (BOM)
175 components, 72 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | RP2350_80QFN | RP2350-QFN-80-1EP_10x10_P0.4mm_EP3.4x3.4mm_ThermalVias | U2 |
| 1 | W25Q80DVSNIG MR25H40MDF | SON127P600X500X90-9N | U3 |
| 1 | ADM1176-1ARMZ-R7 | ADM1176-1ARMZ-R7 | U4 |
| 1 | TPS54226PWPR | PWP14_2P31X2P46-L | U5 |
| 1 | lt3652hvimse#pbf LT3652HVIMSE#PBF | MSOP-12_MSE | U6 |
| 1 | TLV1704 | TSSOP-14_4.4x5mm_P0.65mm | U7 |
| 1 | PE014006 TE PE014006 | Relay_PE014006 | U16 |
| 1 | BQ25883RGER | QFN50P400X400X100-25N-D | U17 |
| 1 | TPS7A4501DCQT | TPS7A4501DCQT | U21 |
| 1 | RFM98PW | RFM98PW | U23 |
| 2 | MMBT2222AT IRLML2803 | SOT-23 | Q5, Q9 |
| 1 | MMBT2222A-TP | SOT-23 | Q6 |
| 2 | DMP2040USS-13 | DMP2040USS-13 | Q10, Q21 |
| 1 | ABM8-272-T3 | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 5031821852 503182-1852 | Molex_503182-1852 | J1 |
| 1 | Conn_ARM_JTAG_SWD_10 | SAMTEC_FTSH-105-01-L-DV-007 | J2 |
| 2 | 35362-0850 | Molex_35362-0850 | J3, J4 |
| 1 | 35362-1250 | Molex_35362-1250 | J5 |
| 1 | 35362-0950 | Molex_35362-0950 | J6 |
| 1 | 901-144 Amphenol_901-144 | SMA_Amphenol_901-144_horizontal | J7 |
Show 52 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 1985807 | 1985807 | J8, J9, J16, J18 |
| 2 | 35362-0450 | Molex_35362-0450 | J10, J17 |
| 1 | MPPT board | PinSocket_2x09_P2.54mm_Vertical | J11 |
| 2 | 35362-0550 | Molex_35362-0550 | J12, J15 |
| 1 | USB_C_pycubed | USB_C_Receptacle_XKB_U262-161N-4BVC11 | J13 |
| 1 | Conn_01x08_Horizontal | PinHeader_1x08_P2.54mm_Horizontal | J14 |
| 1 | 35362-0650 | Molex_35362-0650 | J19 |
| 2 | 35362-0750 | Molex_35362-0750 | J20, J21 |
| 1 | QWIIC | JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical | J22 |
| 1 | Jumper_2_Open | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 2 | Jumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP2, JP3 |
| 2 | KMR231NG LFS | BTN_KMR2_4.6X2.8 | SW1, SW2 |
| 1 | SK6812 1655 | LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1 |
| 1 | CDBA240LL | DO-214AC | D2 |
| 2 | CMSH1-40M | DIOM5226X262N | D3, D7 |
| 1 | DFLS130L-7 DFLS130L | PWRDI-123 | D4 |
| 1 | LTST-C190KGKT GREEN LED | LED_0603_1608Metric | D5 |
| 1 | 1N4151W-E3-08 | D_SOD-123 | D6 |
| 1 | 3.3uH | polarized | L1 |
| 1 | HPC5040NF-3R3MTH 3.3uH | L_2141 | L2 |
| 1 | 68uH | SDE06004A-680K | L3 |
| 1 | MCS25GD-1R0MMP 1uH | L_2510 | L4 |
| 2 | 15pF | C_0603_1608Metric | C1, C2 |
| 17 | 0.1uF | C_0603_1608Metric | C3, C5, C7, C13, C14, C16, C21, C24 +9 |
| 12 | 10uF | C_0603_1608Metric | C9, C25, C30, C35, C39, C41, C42, C43 +4 |
| 6 | 4.7uF | C_0603_1608Metric | C10, C11, C12, C15, C29, C34 |
| 5 | 22uF | C_0603_1608Metric | C17, C18, C31, C37, C38 |
| 3 | 10uF | C_1210_3225Metric | C19, C20, C22 |
| 3 | 1uF | C_0603_1608Metric | C23, C27, C33 |
| 2 | 3.3nF | C_0603_1608Metric | C26, C32 |
| 1 | 47nF | C_0603_1608Metric | C36 |
| 2 | 330k | R_0603_1608Metric | R1, R18 |
| 1 | 110k | R_0603_1608Metric | R2 |
| 8 | 1k | R_0603_1608Metric | R3, R4, R6, R20, R23, R26, R56, R63 |
| 23 | 10k | R_0603_1608Metric | R5, R21, R22, R25, R28, R29, R31, R34 +15 |
| 1 | 0.02 | R_2512_6332Metric | R8 |
| 1 | 121k | R_0603_1608Metric | R9 |
| 1 | 20k | R_0603_1608Metric | R10 |
| 13 | 100k | R_0603_1608Metric | R11, R12, R15, R27, R38, R46, R60, R61 +5 |
| 1 | 73.2k | R_0603_1608Metric | R13 |
| 1 | 22.1k | R_0603_1608Metric | R14 |
| 1 | 49.9k | R_0603_1608Metric | R16 |
| 1 | 510k | R_0603_1608Metric | R17 |
| 1 | 0.27 | R_2512_6332Metric | R19 |
| 3 | 3.3k | R_0603_1608Metric | R33, R58, R59 |
| 1 | 560 | R_0603_1608Metric | R36 |
| 2 | 5.1k | R_0603_1608Metric | R39, R40 |
| 2 | 0 | R_0603_1608Metric | R50, R82 |
| 1 | 4.7M | R_0603_1608Metric | R64 |
| 2 | 33 | R_0603_1608Metric | R65, R81 |
| 2 | 27 | R_0603_1608Metric | R66, R67 |
| 2 | 3k | R_0603_1608Metric | R79, R80 |
Mainboard design files
The KiCad project lives in the pete4radio/SAMWISE-1-2-HW-Training repository on GitHub; these links point at the commit this page was built from.
Mainboard: common questions
What microcontroller does the Mainboard use?
The Mainboard is built around the RP2350_80QFN, from the RP2040/RP2350 family.
How big is the Mainboard PCB?
The Mainboard measures 90.2 × 95.9 mm, has 4 copper layers and is 1.6012 mm thick.
How many components are on the Mainboard?
175 components, from 72 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Mainboard design files?
From the pete4radio/SAMWISE-1-2-HW-Training repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Mainboard design in my own project?
The repository has no license, so all rights stay with pete4radio. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Mainboard 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.
More boards in SAMWISE-1-2-HW-Training
RP2040/RP2350ADCS board
90.2 × 95.9 mm182 parts4LNo license0
RP2040/RP2350Motor Drivers
90.2 × 95.9 mm164 parts4LNo license0
LT8490 - Mezzanine
37.3 × 46 mm103 parts6LNo license0
MPPT addon board
90.2 × 95.9 mm48 parts2LNo license0
Raspberry Pi Interface Board
56 × 65 mm38 parts4LNo license0
Battery Board
95.9 × 90.2 mm31 parts4LNo license0
Z+ Panel
97 × 97.3 mm28 parts4LNo license0
Raspberry Pi433MHz Ground Station Board
95.5 × 56 mm14 parts4LNo license0
Raspberry Pi SX1280 Adapter
30 × 65 mm11 parts4LNo license0
Groundstation 2400 Hat
65 × 56.5 mm10 parts4LNo license0
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