L0czek/railclockThis PCB exposes 11 GPIOs via JST connectors for sensors and actuators. It can run without an external 5V supply by using an on-board battery charger and a boost converter to create a 12V rail for motors and…
Railclock is an open-source printed circuit board by L0czek, from the L0czek/railclock repository on GitHub. It is a 4-layer board of 99.6 × 99.9 mm with 172 parts on 104 nets, routed with 1,175 tracks and 321 vias.
It is built around the ESP32-C6-WROOM-1-N8, DRV8870DDA and MCP4728-E/UN, with the BTS5012SDA, BQ25895RTW and PCF8574RGTR(UMW) among its other parts. Its parts include 68 resistors, 35 capacitors, 21 diodes, 16 connectors and 15 ICs. It belongs with the power boards and the ESP32 and RISC-V boards of this library.
A general-purpose ESP32-C6 module mainboard originally created for the Railclock project and redesigned as a generic controller and motor-power board.
This PCB exposes 11 GPIOs via JST connectors for sensors and actuators. It can run without an external 5V supply by using an on-board battery charger and a boost converter to create a 12V rail for motors and higher-power peripherals.
Firmware for this board is written in Rust and maintained in a separate repository: https://github.com/L0czek/esp32-mainboard
| Qty | Value | Footprint | References |
|---|---|---|---|
| 61 | R | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R11, R14, R15, R17, R18, R22, R23, R24, R25, R26, R27, R28, R29 +45 |
| 18 | C | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3, C5, C10, C13, C21, C25, C27, C30, C31, C33, C34, C35, C36, C37 +2 |
| 16 | D_Zener | Diode_SMD:D_SOD-323 | D3, D4, D5, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19 |
| 7 | Conn_01x04_MountingPin | Connector_JST:JST_PH_S4B-PH-SM4-TB_1x04-1MP_P2.00mm_Horizontal | J3, J9, J10, J11, J12, J13, J14 |
| 6 | Conn_01x03_MountingPin | Connector_JST:JST_PH_S3B-PH-SM4-TB_1x03-1MP_P2.00mm_Horizontal | J2, J5, J6, J7, J8, J15 |
| 5 | BTS5012SDA | Package_TO_SOT_SMD:TO-252-4 | U13, U14, U15, U16, U17 |
| 4 | C_Polarized | Capacitor_SMD:CP_Elec_8x10 | C6, C11, C12, C22 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | Battery_Cell | Battery:BatteryHolder_Keystone_1042_1x18650 | BT2, BT3, BT4 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R61, R62 |
| 2 | 10uF 50V | Capacitor_SMD:C_1210_3225Metric | C18, C20 |
| 2 | 470uF 25V | Capacitor_SMD:CP_Elec_8x10 | C17, C19 |
| 2 | 5.1K | Resistor_SMD:R_0805_2012Metric | R16, R19 |
| 2 | Fuse | Fuse:Fuse_1206_3216Metric | F1, F3 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C38 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric | R20 |
| 1 | 10nF | Capacitor_SMD:C_0805_2012Metric | C14 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C40 |
| 1 | 2.2nF | Capacitor_SMD:C_0805_2012Metric | C16 |
| 1 | 2.2uF | Inductor_SMD:L_Bourns_SRP1038C_10.0x10.0mm | L3 |
| 1 | 22uF 16V | Capacitor_SMD:CP_Elec_4x5.3 | C23 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C39 |
| 1 | 47pF | Capacitor_SMD:C_0805_2012Metric | C15 |
| 1 | 50uF | Capacitor_SMD:C_0805_2012Metric | C41 |
| 1 | 51K | Resistor_SMD:R_0805_2012Metric | R10 |
| 1 | 6.8uH | Inductor_SMD:L_10.4x10.4_H4.8 | L1 |
| 1 | BQ25895RTW | Package_DFN_QFN:Texas_RTW_WQFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm_ThermalVias | U18 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_Horizontal | J16 |
| 1 | Battery_Cell | Battery:BatteryHolder_Renata_SMTU2032-LF_1x2032 | BT1 |
| 1 | C_Polarized | Capacitor_Tantalum_SMD:CP_EIA-7343-31_Kemet-D | C26 |
| 1 | Conn_01x02_Pin | Connector_JST:JST_NV_B02P-NV_1x02_P5.00mm_Vertical | J1 |
| 1 | D | Diode_SMD:D_SMA | D1 |
| 1 | DRV8870DDA | Package_SO:Texas_HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.4x3.1mm_ThermalVias | U5 |
| 1 | ESP32-C6-WROOM-1 | PCM_Espressif:ESP32-C6-WROOM-1 | U4 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D21 |
| 1 | LED | LED_SMD:LED_1206_3216Metric | D2 |
| 1 | MAX811TEUS-T | Package_TO_SOT_SMD:SOT-143 | U11 |
| 1 | MC-306_32.7680K-A5__ROHS | th:OSCL550P800X320X254-4N | Y1 |
| 1 | MCP4728 | Package_SO:MSOP-10_3x3mm_P0.5mm | U12 |
| 1 | MCP73832-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | MCP7940N-xST | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | PAM2421 | Package_SO:Diodes_SO-8EP | U6 |
| 1 | PCF8574RGTR | th:QFN50P300X300X100-17N | U9 |
| 1 | R | Resistor_SMD:R_2010_5025Metric | R4 |
| 1 | R_Potentiometer | Potentiometer_SMD:Potentiometer_Bourns_3214W_Vertical | RV1 |
| 1 | SS14-DC | Diode_SMD:D_SMA | D22 |
| 1 | SS34 | Diode_SMD:D_SMC | D6 |
| 1 | SW_DPDT_x2 | Button_Switch_SMD:SW_DPDT_CK_JS202011JCQN | SW2 |
| 1 | SW_SPST | Button_Switch_SMD:Panasonic_EVQPUL_EVQPUC | SW3 |
| 1 | SW_SPST | Button_Switch_SMD:SW_SPST_B3S-1000 | SW1 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J4 |
| 1 | ~ | Package_TO_SOT_SMD:SOT-223-6 | U7 |
It measures 99.6 × 99.9 mm and has 4 copper layers, 1.6 mm thick.
172 parts, built around the ESP32-C6-WROOM-1-N8, DRV8870DDA, MCP4728-E/UN and BTS5012SDA. 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.
From the L0czek/railclock repository on GitHub, at the commit this page was made from: the board is railclock.kicad_pcb and its schematic railclock.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask L0czek before reusing the design.
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