Main Board
About the Main Board
Main Board is an open source ESP32 PCB design by jayalcock, published on GitHub. It is a 2-layer board measuring 55.4 × 54.6 mm, with 64 components from 35 distinct parts.
Its main chip is the ESP32-C3-MINI-1, from the ESP32 family. Other key parts include the BD9E302EFJ-E2, MCP2551-I-P, NCP718XSN330 and LPC1768FBD100. By type, the board carries 24 capacitors, 20 resistors, 5 ICs, 5 connectors, 5 diodes and 2 crystals.
From the project
A million times clock project
Main components on the Main Board
Main Board bill of materials (BOM)
64 components, 35 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BD9E302EFJ-E2 | HTSOP-J8_ROM | U1 |
| 1 | ESP32-C3-MINI-1 | ESP32-C3-MINI-1 | U2 |
| 1 | MCP2551-I-P | DIP-8_W7.62mm | U3 |
| 1 | NCP718XSN330 NCP718xSN330 | SOT-23-5 | U4 |
| 1 | LPC1768FBD100 | LQFP-100_14x14mm_P0.5mm | U5 |
| 1 | 12MHZ/10PF 12MHz/10pF | Crystal_SMD_Abracon_ABM3B-4Pin_5.0x3.2mm | Y1 |
| 1 | 32.768KHZ/9PF 32.768kHz/9pF | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y2 |
| 1 | PJ-102A CUI Inc. | Barrel_Jack_5.5mmODx2.1mmID_PJ-102A | J1 |
| 1 | 282834-3 ~ | CONN_282834-3_TYC | J2 |
| 1 | 3220-10-0100-00 Conn_ARM_JTAG_SWD_10 | CONN_3220-10-0100-00_CNC | J3 |
| 1 | PPTC041LFBN 0022232041 Molex | PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | 282834-2 ~ | CONN2_282834-2_TEC | J5 |
| 1 | L102021ML04Q | SW_L102021ML04Q | S1 |
| 1 | SW_SPST | Switch_Tactile_SMD_6x6mm_PTS645 | SW1 |
| 1 | B340AE B340 | D_SMA | D1 |
| 4 | XZCM2CRK53WA-8VF LED Low current | LED_0603_1608Metric | D2, D3, D4, D5 |
| 1 | NR6028T4R7M 4.7uH | IND_NR6028T4R7M | L1 |
| 2 | C0603C104K5RECAUTO 10uF | C_0603_1608Metric | C1, C4 |
| 3 | CL10B104KB8NNWC 0.1uF | C_0603_1608Metric | C2, C3, C5 |
| 1 | 0603B682M500CT 6800pF | C_0603_1608Metric | C6 |
Show 15 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | CL10B105KP8NNNC 1uF | C_0603_1608Metric | C7, C12, C15 |
| 2 | CL10A226MP8NUNE 22uF | C_0603_1608Metric | C8, C10 |
| 1 | C0603C102K4RECAUTO 1nF | C_0603_1608Metric | C9 |
| 5 | CL10B104KA8NNNC 100nF | C_0603_1608Metric | C11, C18, C20, C22, C24 |
| 4 | 0603N180J500CT 18pF | C_0603_1608Metric | C13, C14, C16, C17 |
| 3 | 0603B183K500CT 10nF | C_0603_1608Metric | C19, C21, C23 |
| 5 | RMCF0201FT10K0 10k | R_0603_1608Metric | R1, R2, R6, R7, R17 |
| 1 | RC0603FR-07430KL 430k | R_0603_1608Metric | R3 |
| 1 | RC0603FR-0782KL 82k | R_0603_1608Metric | R4 |
| 2 | 60R | R_0603_1608Metric | R5, R8 |
| 5 | 50R | R_0603_1608Metric | R9, R10, R11, R12, R13 |
| 1 | 1K6 1k6 | R_0603_1608Metric | R14 |
| 1 | 100R | R_0603_1608Metric | R15 |
| 1 | 100K 100k | R_0603_1608Metric | R16 |
| 3 | 750R | R_0603_1608Metric | R19, R20, R21 |
Main Board design files
The KiCad project lives in the jayalcock/Clocks repository on GitHub; these links point at the commit this page was built from.
Main Board: common questions
What microcontroller does the Main Board use?
The Main Board is built around the ESP32-C3-MINI-1, from the ESP32 family.
How big is the Main Board?
The Main Board measures 55.4 × 54.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main Board?
64 components, from 35 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 Main Board design files?
From the jayalcock/Clocks 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 Main Board design in my own project?
The repository has no license, so all rights stay with jayalcock. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Main Board 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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