Mainboard
About the Mainboard PCB
Mainboard is an open source ESP32 PCB design by tr0fin0, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 55 × 70 mm, with 84 components from 23 distinct parts.
Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the KF33BDT and CD74HC4067M. By type, the board carries 27 resistors, 17 switches, 13 diodes, 12 capacitors, 8 connectors and 4 ICs.
It belongs with the robotics & motion designs in this gallery.
From the project
An ESP32-S3 based open source firmware and hardware sumo robot controller.
Main components on the Mainboard
Mainboard bill of materials (BOM)
84 components, 23 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | Regulator_DC-DC_MINI-360 | U1 |
| 1 | KF33BDT | Regulator_KF33BD-TR | U2 |
| 1 | CD74HC4067M | SOIC-24W_7.5x15.4mm_P1.27mm | U3 |
| 1 | ESP32-S3-WROOM-1 | ESP32-S3-WROOM-1 | U4 |
| 1 | MICRO_START | Connector_JST_ZH_B3B-ZR_1x03_P1.50mm_Vertical | J1 |
| 1 | LRGB | Connector_JST_ZH_B4B-ZR_1x04_P1.50mm_Vertical | J2 |
| 1 | ESC_L | PinSocket_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_02x08_Odd_Even | PinSocket_2x08_P2.54mm_Vertical | J4 |
| 1 | ESC_R | PinSocket_1x03_P2.54mm_Vertical | J7 |
| 1 | ENC_R | Connector_JST_ZH_B3B-ZR_1x03_P1.50mm_Vertical | J8 |
| 1 | ENC_L | Connector_JST_ZH_B3B-ZR_1x03_P1.50mm_Vertical | J9 |
| 1 | USB_C | Connector_USB-C | P1 |
| 2 | Jumper_2_Open | SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP3 |
| 1 | FS-iA6 | Receiver_FS-iA6 | RC1 |
| 16 | Conn_01x03 | Connector_JST_ZH_B3B-ZR_1x03_P1.50mm_Vertical | S01, S02, S03, S04, S05, S06, S07, S08 +8 |
| 1 | SW_Push | SW_SPST_PTS810 | SW1 |
| 3 | BLUE_2V6 | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3 |
| 2 | LESD5D5.0CT1G | D_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4, D5 |
| 8 | WS2812B-4020-G1 | LED_WS2812B-4020 | D6, D7, D8, D9, D10, D11, D12, D13 |
| 8 | 1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C6, C7, C8, C9, C10 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 10u 16V | CP_Radial_D5.0mm_P2.00mm | C4, C5, C11, C12 |
| 10 | 20k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R3, R4, R6, R8, R10, R12, R14 +2 |
| 17 | 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R5, R7, R9, R11, R13, R15, R16 +9 |
Mainboard design files
The KiCad project lives in the tr0fin0/dolphin 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 ESP32-S3-WROOM-1, from the ESP32 family.
How big is the Mainboard PCB?
The Mainboard measures 55 × 70 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mainboard?
84 components, from 23 distinct parts. The full bill of materials is listed on this page.
Where can I download the Mainboard design files?
From the tr0fin0/dolphin repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Mainboard design in my own project?
Yes, under the terms of its GPL-3.0 license, which tr0fin0 chose for the repository.
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 ESP32 firmware against it before you order a PCB.
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