2 layers34.5 × 20 mm
2 layers178 × 59 mm
Main board-2027
Barbatronic/CDR-2027- Size
- 178 × 59 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 83
- Nets
- 71
- Pads
- 330
- Tracks, vias
- 83, 7
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 Jun 2026
- Updated
- 7 Nov 2026
Overview
Main board-2027 is an open-source printed circuit board by Barbatronic, from the Barbatronic/CDR-2027 repository on GitHub. It is a 2-layer board of 178 × 59 mm with 83 parts on 71 nets, routed with 83 tracks and 7 vias.
It is built around the BOB-12009, ESP32-S3-WROOM-1U-N16R2 and R-78B3.3-2.0, with the R-78B5.0-2.0, AO3400A and SS34 among its other parts. Its parts include 22 connectors, 17 resistors, 13 capacitors, 12 diodes and 6 ICs. It belongs with the ESP32 boards of this library.
Main components
6BOB-12009
-ModulesSparkFun Electronics
ESP32-S3-WROOM-1U-N16R2
SMD,19.2x18mm-103.5dBm -40℃~+85℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 UART、SPI、I2C、GPIO、I2S SMD,19.2x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
R-78B3.3-2.0
--40°C ~ 70°C 0.45" Length x 0.33" Width x 0.69" Height (11.5mm x 8.5mm x 17.5mm) 1 2A 3-SIP Module 3.3V 32V 4.75V 92% ITE (Commercial) Linear Regulator Replacement OTP,SCP Through Hole - Power Module/Power Supply ROHSRECOM PowerPower Supply Module,Power SuppliesR-78B5.0-2.0
SIP-3-40℃~+70℃ 1 11.5mm 17.5mm 2A 2mA 460kHz 5V 6.5V~32V 75mVp-p 8.5mm 820uF 94% Regulated type Short Circuit Protection、Automatic fault recovery SIP-3 Isolated Power Modules ROHSRECOM PowerIsolated Power Modules
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
README.mdKaribous-2027-Differential-Robot
Parts
83| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 3.3k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R15, R16, R18, R19, R20 |
| 5 | LED_Small | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D11, D13, D14, D16, D17 |
| 4 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R23, R24, R25, R26 |
| 4 | 22uF | Capacitor_SMD:CP_Elec_5x5.4 | C14, C15, C16, C17 |
| 4 | Conn_01x02 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J23, J25, J28, J30 |
| 4 | External tools | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J24, J27, J29, J31 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H5, H6, H7, H8 |
| 3 | D_Small | Diode_SMD:D_SMA_Handsoldering | D15, D18, D19 |
| 3 | XT30 | Connector_AMASS:AMASS_XT30U-F_1x02_P5.0mm_Vertical | J16, J17, J18 |
| 2 | 0.1uF | Capacitor_SMD:C_1206_3216Metric | C4, C5 |
| 2 | 0.1uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C6, C8 |
| 2 | 10K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R3, R5 |
| 2 | 10uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C9, C10 |
| 2 | 220uF | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C13, C18 |
| 2 | 4.7k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R21, R22 |
| 2 | D_TVS_Bidirectional_Generic | Diode_SMD:D_SOD-523 | D6, D7 |
| 2 | ~ | Connector_Molex:Molex_KK-396_A-41791-0002_1x02_P3.96mm_Vertical | J20, J26 |
| 1 | 100 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R27 |
| 1 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R28 |
| 1 | 1K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1 |
| 1 | 1uF/16V | Capacitor_SMD:C_1206_3216Metric | C3 |
| 1 | 330 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R17 |
| 1 | AO3400A | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q1 |
| 1 | BAU | Connector_Molex:Molex_KK-396_A-41791-0002_1x02_P3.96mm_Vertical | J22 |
| 1 | BOB-12009 | footprint-project:CONV_BOB-12009 | U6 |
| 1 | Blue | LED_SMD:LED_1206_3216Metric | D3 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ2 |
| 1 | D36V50F5 | footprint-project:D36V50F5 | PS1 |
| 1 | DRV5033 | Package_TO_SOT_SMD:SOT-23_Handsoldering | U2 |
| 1 | ESP32-S3-WROOM-1U-N16R2 | RF_Module:ESP32-S3-WROOM-1U | U1 |
| 1 | Encoder_Left | Connector_Molex:Molex_KK-254_AE-6410-05A_1x05_P2.54mm_Vertical | J9 |
| 1 | Encoder_Right | Connector_Molex:Molex_KK-254_AE-6410-05A_1x05_P2.54mm_Vertical | J3 |
| 1 | FINDER-36.11 | Relay_THT:Relay_SPDT_Finder_36.11 | K2 |
| 1 | Fuse_Small | Fuse:Fuseholder_Blade_Mini_Keystone_3568 | F1 |
| 1 | Lidar LD06 | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J12 |
| 1 | NeoPixel | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J1 |
| 1 | R-78B3.3-2.0 | Converter_DCDC:Converter_DCDC_RECOM_R-78B-2.0_THT | U7 |
| 1 | R-78B5.0-2.0 | Converter_DCDC:Converter_DCDC_RECOM_R-78B-2.0_THT | U8 |
| 1 | SS34 | Diode_SMD:D_SMA_Handsoldering | D20 |
| 1 | SW_Boot | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SWBoot1 |
| 1 | SW_EN | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SWEn1 |
| 1 | SW_Push | PCM_Switch_Keyboard_Cherry_MX:SW_Cherry_MX_PCB | SW2 |
| 1 | SW_SPDT | footprint-project:SK-12D10 1P2T | SW1 |
| 1 | Serial | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J13 |
| 1 | Steppers | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J100 |
| 1 | USB_B | Connector_USB:USB_B_TE_5787834_Vertical | J2 |
| 1 | WIZ850io_W5500_Module | footprint-project:WIZ850io_W5500_Module | U3 |
| 1 | XT60 | Connector_AMASS:AMASS_XT60-M_1x02_P7.20mm_Vertical | J5 |
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Questions
How big is the Main board-2027 PCB?
It measures 178 × 59 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Main board-2027 use?
83 parts, built around the BOB-12009, ESP32-S3-WROOM-1U-N16R2, R-78B3.3-2.0 and R-78B5.0-2.0. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Main board-2027 KiCad files?
From the Barbatronic/CDR-2027 repository on GitHub, at the commit this page was made from: the board is ECAD/main-board-2027/main-board-2027.kicad_pcb and its schematic ECAD/I2C-motors-drivers/I2C-motors-drivers.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Main board-2027 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Barbatronic before reusing the design.