Avalon HW
About the Avalon HW PCB
Avalon HW is an open source STM32 PCB design by YassineBakkali, published on GitHub under the MIT license. It is a 4-layer board measuring 118 × 89.6 mm, with 215 components from 70 distinct parts.
Its main chip is the STM32G474RETX, from the STM32 family. Other key parts include the AZ1117CH-3.3TRG1, AT25EU0021A-SSHN-T, ATA6560-GAQW-N, UCC27211AQDDARQ1 and USBLC6-2SC6. By type, the board carries 92 capacitors, 57 resistors, 23 diodes, 19 ICs, 11 connectors and 5 inductors.
It belongs with the power & battery designs in this gallery.
From the project
STM32-controlled bidirectional buck-boost PCB to charge/discharge supercapacitors for short-term power compensation under RoboMaster power limits.
Avalon is the custom-designed supercapacitor power manager developed by the Calibur Robotics team at the National University of Singapore (NUS) for the RoboMaster University Championship 2025 (RMUC).
This repository contains the full KiCad design files for the Avalon PCB, along with exported schematics and layout PDFs for easier reference and review. Avalon is built to manage high-speed charge and discharge cycles between the robot’s main power source and a dedicated supercapacitor bank.
Main components on the Avalon HW
Avalon HW bill of materials (BOM)
215 components, 70 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | AZ1117CH-3.3TRG1 | SOT230P700X180-4N | IC2, IC8 |
| 1 | AT25EU0021A-SSHN-T | SOIC127P600X175-8N | IC3 |
| 2 | ATA6560-GAQW-N | SOIC127P600X175-8N | IC4, IC6 |
| 1 | STM32G474RETX STM32G474RETx | LQFP-64_10x10mm_P0.5mm | U1 |
| 2 | UCC27211AQDDARQ1 | DDA0008E_N | U2, U8 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U3 |
| 1 | REF3033 | SOT-23 | U4 |
| 2 | AP63200WU | TSOT-23-6 | U6, U7 |
| 3 | INA186A2IDCKT | INA186 | U9, U12, U13 |
| 4 | NCS325 | SOT-23-5 | U11, U14, U15, U16 |
| 4 | POW_NMOS | DFN5&asterisk_6-8L_GFD | Q1, Q2, Q3, Q4 |
| 1 | ECS-480-8-33B2Q-JVY-TR3 | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y3 |
| 1 | MOLEX_ClikMate | Molex_PicoBlade_53261-0471_1x04-1MP_P1.25mm_Horizontal | J2 |
| 1 | USB_C_RECEPTACLE_USB2.0 USB_C_Receptacle_USB2.0 | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J3 |
| 1 | XT30PB XT30PW | XT30PWM | J4 |
| 4 | JST_GH_SM02 | JST_GH_SM02B-GHS-TB_1x02-1MP_P1.25mm_Horizontal | J6, J7, J8, J9 |
| 2 | JST_GH_SM03 | JST_GH_SM03B-GHS-TB_1x03-1MP_P1.25mm_Horizontal | J13, J14 |
| 2 | XT30PW-F | XT30PWF | J15, J16 |
| 1 | 0685H9300-01 | Fuse_1206_3216Metric | F3 |
| 1 | EVQP7C01P | EVQP7C01P | S1 |
Show 50 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NTC 10K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | TH1 |
| 7 | LED | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2, D5, D6, D7, D8, D13 |
| 6 | PESD5V0F1BL,315 TPD1E10B06DPYR-EV | D_0402_1005Metric_Pad0.77x0.64mm_HandSolder | D3, D4, D9, D10, D11, D12 |
| 4 | MMSD4148T3G | D_SOD-123 | D14, D15, D16, D17 |
| 2 | BAT41ZFILM | D_SOD-123 | D18, D20 |
| 2 | SMCJ33A | D_SMC | D19, D21 |
| 2 | BAT41ZFILM | D_SOD-123 | D22, D23 |
| 1 | 10.0UH 10.0uH | IND_VLS5045EX-100M | L1 |
| 2 | 26R@100MHz | L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | L2, L5 |
| 1 | 3.6UH 3.6uH | IND_ASPI-6045S-3R6N-T | L3 |
| 1 | 15UH 15uH | IND_SUPERCAP | L4 |
| 4 | 10UF 10uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C63, C66, C68 |
| 2 | 36V10UF 36v10uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2, C33 |
| 2 | 22UF 22uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C64 |
| 2 | 50V100NF 50v100nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C29 |
| 2 | 50V100PF 50v100pF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C5, C27 |
| 4 | 1000NF 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C6, C21, C24, C34 |
| 2 | 12PF 12pF | C_0402_1005Metric | C7, C11 |
| 17 | 100NF 100nF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C8, C12, C13, C14, C15, C16, C19, C20 +9 |
| 2 | 1UF 1uF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C9, C18 |
| 1 | 4.7UF 4.7uF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C10 |
| 1 | 10NF 10nF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C17 |
| 2 | 4.7NF 4.7nF | C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C26, C28 |
| 2 | 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C30, C32 |
| 18 | 100NF 100nF | C_0402_1005Metric | C35, C70, C71, C72, C73, C74, C75, C85 +10 |
| 4 | 50V22UF 50v22uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C36, C37, C40, C41 |
| 2 | 10UF 10uF | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C43, C45 |
| 2 | 100NF 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C44, C46 |
| 6 | 220uF@35V | A769KS227M1VLAS016 | C47, C48, C49, C53, C54, C55 |
| 8 | 20uF@50V | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C50, C51, C52, C56, C57, C58, C59, C60 |
| 9 | 10NF 10nF | C_0402_1005Metric | C76, C77, C78, C79, C80, C81, C82, C83 +1 |
| 2 | 100R | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R4 |
| 2 | 22.1K 22.1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R5 |
| 4 | 200R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R13, R15, R17 |
| 2 | 5.1KR 5.1kR | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R6, R7 |
| 4 | 1M | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8, R19, R20, R21 |
| 4 | 20K 20k | R_0402_1005Metric | R9, R10, R14, R16 |
| 2 | 200R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11, R18 |
| 1 | 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12 |
| 2 | 4.7K 4.7k | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R23, R27 |
| 4 | 60R | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R30, R31, R34, R35 |
| 1 | 115.8K 115.8k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R39 |
| 4 | 100K 100k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R42, R56, R57, R72 |
| 3 | 10K 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R43, R73, R77 |
| 1 | 309.0K 309.0k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R51 |
| 4 | 1R | R_0402_1005Metric | R52, R53, R54, R55 |
| 1 | 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R58 |
| 1 | 33R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R59 |
| 3 | 0.004R 0.002R | R_2512_6332Metric | R60, R61, R62 |
| 12 | 100R | R_0402_1005Metric | R63, R64, R65, R66, R67, R68, R69, R70 +4 |
Avalon HW design files
The KiCad project lives in the YassineBakkali/Avalon_HW repository on GitHub; these links point at the commit this page was built from.
- Layoutctl_board.kicad_pcb
- Schematicctl_board.kicad_sch
- BOMbom/ctl_board_bom.xlsb.csv
Avalon HW: common questions
What microcontroller does the Avalon HW use?
The Avalon HW is built around the STM32G474RETX, from the STM32 family.
How big is the Avalon HW PCB?
The Avalon HW measures 118 × 89.6 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Avalon HW?
215 components, from 70 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 Avalon HW design files?
From the YassineBakkali/Avalon_HW 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 Avalon HW design in my own project?
Yes, under the terms of its MIT license, which YassineBakkali chose for the repository.
Can I test firmware for the Avalon HW without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
Similar boards
STM32AxxSolder
AxxAxx
39 × 82.5 mm122 parts2LGPL-3.01.7k
STM32AIOC
skuep
21 × 31.5 mm47 parts2LMIT1.4k
STM32Ferris
pierrechevalier83
208.8 × 86.8 mm102 parts2LSHL-2.11.3k
STM32Module 16S
stuartpittaway
71.1 × 89.6 mm113 parts4LCC-BY-NC-4.01.1k
STM32Djinn
tzarc
192.3 × 150.5 mm216 parts2LCERN-OHL-S-2.0988
STM32Ghoul
228.6 × 79.4 mm163 parts2LCERN-OHL-S-2.0988