Butter board
About the Butter board
Butter board is an open source ESP32 PCB design by cr1tbit, published on GitHub. It is a 4-layer board measuring 90 × 58.6 mm, with 76 components from 33 distinct parts.
Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the SN74LVC2T45DCUR, FT2232HL, 93LCxxAxxOT and PCF8574. By type, the board carries 30 capacitors, 23 resistors, 8 connectors, 5 ICs, 4 jumpers and 2 diodes.
From the project
USB-C to everything adapter
Main components on the Butter board
Butter board bill of materials (BOM)
76 components, 33 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-S3-WROOM-1 | ESP32-S3-WROOM-1 | U1 |
| 1 | SN74LVC2T45DCUR | VSSOP-8_2.4x2.1mm_P0.5mm | U2 |
| 1 | FT2232HL | LQFP-64_10x10mm_P0.5mm | U3 |
| 1 | 93LCxxAxxOT | SOT-23-6 | U4 |
| 1 | PCF8574 | SOIC-16W_7.5x10.3mm_P1.27mm | U5 |
| 1 | 12MHZ 2520 | Crystal_SMD_2520-4Pin_2.5x2.0mm | Y1 |
| 1 | JTAG_OUT | PinHeader_2x04_P2.54mm_Horizontal | J1 |
| 1 | Conn_02x02_Odd_Even | PinHeader_2x02_P2.54mm_Vertical | J2 |
| 1 | Conn_02x30_Top_Bottom | Hirose_DF12_DF12C3.0-60DS-0.5V_2x30_P0.50mm_Vertical | J3 |
| 1 | UART_OUT | PinHeader_2x04_P2.54mm_Horizontal | J4 |
| 1 | Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | STM_EXT_IO | PinHeader_2x06_P2.54mm_Horizontal | J6 |
| 1 | Conn_01x08 | PinSocket_1x08_P2.54mm_Vertical | J7 |
| 1 | Conn_02x06_Odd_Even | PinHeader_2x06_P2.54mm_Horizontal | J8 |
| 1 | TDO_VSHIFT | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | SWD_ENA | SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP2 |
| 1 | RXD_VSHIFT | PinHeader_1x03_P2.54mm_Vertical | JP3 |
| 1 | IOEXP_ADDR | SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP4 |
| 1 | SW_Push | SW_SPST_B3U-3000P-B | SW1 |
| 2 | LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2 |
Show 13 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | L_Ferrite | L_0805_2012Metric | L1, L2 |
| 7 | 1n | C_0402_1005Metric | C1, C24, C25, C26, C27, C28, C29 |
| 4 | 10u | C_0805_2012Metric | C2, C4, C16, C23 |
| 14 | 100n | C_0402_1005Metric | C3, C5, C6, C7, C8, C9, C10, C11 +6 |
| 2 | 22u | C_0805_2012Metric | C17, C18 |
| 2 | 20p | C_0402_1005Metric | C21, C22 |
| 1 | 220u | CP_Radial_D5.0mm_P2.50mm | C30 |
| 14 | 100k | R_0402_1005Metric | R1, R2, R4, R6, R7, R8, R14, R15 +6 |
| 3 | 470 | R_0402_1005Metric | R3, R9, R10 |
| 1 | 12k | R_0402_1005Metric | R5 |
| 1 | 2k2 | R_0402_1005Metric | R11 |
| 2 | 2.2k | R_0402_1005Metric | R12, R13 |
| 2 | 22 | R_Array_Convex_4x0603 | RN1, RN2 |
Butter board design files
The KiCad project lives in the cr1tbit/superhubby repository on GitHub; these links point at the commit this page was built from.
Butter board: common questions
What microcontroller does the Butter board use?
The Butter board is built around the ESP32-S3-WROOM-1, from the ESP32 family.
How big is the Butter board?
The Butter board measures 90 × 58.6 mm, has 4 copper layers and is 1.025 mm thick.
How many components are on the Butter board?
76 components, from 33 distinct parts. The full bill of materials is listed on this page.
Where can I download the Butter board design files?
From the cr1tbit/superhubby repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Butter board design in my own project?
The repository has no license, so all rights stay with cr1tbit. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Butter 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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