Bigtolt
About the Bigtolt PCB
Bigtolt is an open source ESP32 PCB design by LJBoxx, published on GitHub under the CERN-OHL-S-2.0 license. It is a 6-layer board measuring 111.1 × 130.1 mm, with 396 components from 95 distinct parts.
Its main chip is the ESP32-C3_SUPERMINI_SMD, from the ESP32 family. Other key parts include the STM32F405RGTx, L6491, INA240/241, MC74VHC1GT66 and AMS1117-3.3. By type, the board carries 155 capacitors, 124 resistors, 34 diodes, 24 ICs, 22 inductors and 20 transistors.
From the project
high power esc based off vesc project with tolt mosfet
18 mosfet TOLT package esc design based off vesc6 schematic and compatible with VESC firmware.
There is also a small high voltage converter used for higher voltage operation, aim was to have a quite big voltage operation range. But if you will test it with high voltage, please do mind that the voltage sensing is un-isolated
Main components on the Bigtolt
Bigtolt bill of materials (BOM)
396 components, 95 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F405RGTx | LQFP-64_10x10mm_P0.5mm | U1 |
| 3 | L6491 | SO-14_3.9x8.65mm_P1.27mm | U2, U3, U4 |
| 3 | INA240/241 | SOT-23-8 | U5, U7, U9 |
| 6 | MC74VHC1GT66 | SOT-353_SC-70-5 | U6, U8, U10, U11, U12, U13 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U14 |
| 1 | LP5907MFX-3.3 | SOT-23-5 | U15 |
| 1 | TPS82130 | Texas_SIL0008D_MicroSiP-8-1EP_2.8x3mm_P0.65mm_EP1.1x1.9mm_ThermalVias | U16 |
| 1 | BMI323 | Bosch_LGA-14_3x2.5mm_P0.5mm | U17 |
| 1 | ESP32-C3_SUPERMINI_SMD | MODULE_ESP32-C3_SUPERMINI | U18 |
| 1 | TJA1051T-3 | SOIC-8_3.9x4.9mm_P1.27mm | U20 |
| 3 | SRV05-4 | SOT-23-6 | U21, U22, U23 |
| 1 | LTC7138xMSE | Analog_MSOP-12-16-1EP_3x4.039mm_P0.5mm_EP1.651x2.845mm | U24 |
| 1 | LNK306D | PowerIntegrations_SO-8C | U25 |
| 18 | NMOS | HDSOP-16-2 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +10 |
| 1 | CJ3400 | SOT-23 | Q19 |
| 1 | BSS131 | SOT-23 | Q20 |
| 1 | 8m | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 3 | Conn_01x05 | JST_PH_B5B-PH-K_1x05_P2.00mm_Vertical | J1, J4, J7 |
| 1 | USB_C_Receptacle_USB2.0 | USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J2 |
| 1 | Conn_01x06 | JST_PH_B6B-PH-K_1x06_P2.00mm_Vertical | J3 |
Show 75 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | Conn_01x03 | JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J5, J6, J9, J10 |
| 1 | Conn_01x02 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J8 |
| 1 | Conn_01x05 | PinHeader_1x05_P2.54mm_Vertical | J11 |
| 1 | BOOT0 | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | J14 |
| 1 | NRST | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | J15 |
| 2 | Jumper_2_Open | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2, JP3 |
| 1 | Jumper_2_Open | PinHeader_1x02_P2.54mm_Vertical | JP6 |
| 3 | STTH2R06A | D_SMA | D1, D2, D3 |
| 18 | D | D_SOD-123 | D4, D5, D6, D7, D8, D9, D10, D11 +10 |
| 1 | green | LED_0603_1608Metric | D22 |
| 1 | MMSZ5242B | D_SOD-123 | D23 |
| 2 | BZT52C3V6-7-F | D_SOD-123 | D24, D25 |
| 1 | red | LED_0603_1608Metric | D26 |
| 1 | blue | LED_0603_1608Metric | D27 |
| 1 | BAT46W | D_SOD-323F | D28 |
| 1 | BZT52C5V6-7-F | D_SOD-123 | D29 |
| 3 | SS1200 | D_SMA | D30, D31, D32 |
| 2 | STTH1R06U | D_SMB | D33, D34 |
| 18 | FerriteBead | C_0603_1608Metric | FB1, FB2, FB3, FB4, FB5, FB6, FB7, FB8 +10 |
| 2 | 10uh | IND-SMD_L3.9-W3.9-1 | L1, L2 |
| 1 | 1.5mH | L_Bourns_SRN8040TA | L4 |
| 1 | 220uH | IND-SMD_L8.0-W8.0_FNR80XXS | L5 |
| 28 | 100n | C_0402_1005Metric | C1, C2, C3, C4, C24, C25, C26, C27 +20 |
| 12 | 2.2uf | C_0603_1608Metric | C5, C6, C7, C8, C9, C10, C13, C14 +4 |
| 2 | 15p | C_0402_1005Metric | C11, C12 |
| 13 | 4.7u | C_0805_2012Metric | C15, C17, C19, C21, C22, C23, C81, C83 +5 |
| 3 | 220nF | C_0402_1005Metric | C16, C18, C20 |
| 3 | 15n | C_0603_1608Metric | C29, C36, C41 |
| 9 | 1n | C_0603_1608Metric | C30, C35, C40, C51, C52, C53, C153, C154 +1 |
| 7 | 10uF | C_1210_3225Metric | C42, C43, C44, C71, C85, C88, C149 |
| 4 | 100n | C_0603_1608Metric | C54, C55, C56, C57 |
| 1 | 33uF | CP_Elec_4x5.4 | C61 |
| 11 | 100nF | C_0402_1005Metric | C62, C64, C67, C69, C116, C118, C120, C122 +3 |
| 9 | 2.2uF | C_1210_3225Metric | C63, C65, C68, C70, C117, C119, C121, C124 +1 |
| 1 | 100uF | C_0402_1005Metric | C66 |
| 1 | 430pF | R_0402_1005Metric | C72 |
| 1 | 47uF | C_0805_2012Metric | C73 |
| 1 | 33uF | CP_Radial_D10.0mm_P2.50mm_P5.00mm | C74 |
| 1 | 470nF | C_1210_3225Metric | C75 |
| 2 | 22uF | C_1210_3225Metric | C77, C148 |
| 1 | 33uF | CP_EIA-3528-15_AVX-H | C86 |
| 11 | 560u | CP_Radial_D16.0mm_P7.50mm | C89, C90, C92, C93, C94, C95, C96, C97 +3 |
| 30 | 1uf | C_2220_5750Metric | C101, C102, C103, C104, C105, C106, C107, C108 +22 |
| 1 | 100n | C_1210_3225Metric | C147 |
| 1 | 100nF | C_1206_3216Metric | C150 |
| 1 | 10uF | CP_EIA-3216-18_Kemet-A | C151 |
| 1 | 100uF | CP_Elec_6.3x5.4 | C152 |
| 38 | 10k | R_0603_1608Metric | R1, R2, R3, R37, R38, R39, R40, R41 +30 |
| 3 | 0 | R_0815_2038Metric | R4, R68, R69 |
| 18 | 24r | R_0805_2012Metric | R5, R6, R7, R8, R9, R10, R14, R15 +10 |
| 9 | 0.3mr | R5930 | R11, R12, R13, R20, R21, R22, R30, R31 +1 |
| 2 | 5k1 | R_0603_1608Metric | R26, R84 |
| 7 | 1k | R_0603_1608Metric | R33, R34, R35, R67, R70, R71, R115 |
| 3 | 320k | R_0603_1608Metric | R36, R51, R53 |
| 3 | 240k | R_1206_3216Metric | R43, R45, R47 |
| 3 | 5.1k | R_0603_1608Metric | R44, R46, R48 |
| 2 | 470k | R_1206_3216Metric | R49, R96 |
| 1 | 10.2k | R_0603_1608Metric | R50 |
| 3 | 10k_NTC | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R58, R59, R60 |
| 1 | 523k | R_0402_1005Metric | R64 |
| 2 | 220r | R_0603_1608Metric | R65, R66 |
| 8 | 2k2 | R_0603_1608Metric | R73, R74, R75, R79, R81, R100, R101, R102 |
| 5 | 4.3k | R_0603_1608Metric | R76, R77, R78, R80, R82 |
| 1 | 120ohm | R_0603_1608Metric | R83 |
| 2 | 100k | R_0402_1005Metric | R94, R95 |
| 1 | 470r | R_0603_1608Metric | R97 |
| 4 | 100r | R_0603_1608Metric | R98, R122, R123, R124 |
| 1 | 2.8M | R_0603_1608Metric | R112 |
| 1 | 200k | R_0603_1608Metric | R113 |
| 1 | 4.7M | R_1206_3216Metric | R114 |
| 1 | 100k | R_0603_1608Metric | R116 |
| 1 | 2k | R_2512_6332Metric | R117 |
| 1 | 12.7k | R_1206_3216Metric | R118 |
| 1 | 0 | R_0603_1608Metric | R119 |
| 1 | 4k | R_0603_1608Metric | R120 |
Bigtolt design files
The KiCad project lives in the LJBoxx/bigtolt repository on GitHub; these links point at the commit this page was built from.
- Layouttolt/tolt.kicad_pcb
- Schematictolt/tolt.kicad_sch
Bigtolt: common questions
What microcontroller does the Bigtolt use?
The Bigtolt is built around the ESP32-C3_SUPERMINI_SMD, from the ESP32 family.
How big is the Bigtolt PCB?
The Bigtolt measures 111.1 × 130.1 mm, has 6 copper layers and is 1.6 mm thick.
How many components are on the Bigtolt?
396 components, from 95 distinct parts. The full bill of materials is listed on this page.
Where can I download the Bigtolt design files?
From the LJBoxx/bigtolt repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Bigtolt design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which LJBoxx chose for the repository.
Can I test firmware for the Bigtolt without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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