2 layers51 × 71 mm
4 layers160 × 100 mm
Step load
AHGure/step_load- Size
- 160 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 212
- Nets
- 153
- Pads
- 633
- Tracks, vias
- 1,025, 425
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Oct 2025
- Updated
- 15 Feb 2026
Overview
Step load is an open-source printed circuit board by AHGure, from the AHGure/step_load repository on GitHub. It is a 4-layer board of 160 × 100 mm with 212 parts on 153 nets, routed with 1,025 tracks and 425 vias.
It is built around the ESP32-C3-WROOM-02-H4, LM35DZ and TCA9535PWR(UMW), with the CUS10S30, G6K-2F-Y-5V and SI2302CDS among its other parts. Its parts include 84 resistors, 38 diodes, 36 capacitors, 20 switches and 16 transistors. It belongs with the ESP32 and RISC-V boards of this library.
Main components
6
ESP32-C3-WROOM-02-H4
SMD,20x18mm-105dBm -40℃~+105℃ 2.4GHz 20.5dBm 345mA 3V~3.6V 82mA Bluetooth5.0 ESP32-C3 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,20x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
LM35DZ
TO-920° to +100°C ±0.6°C Precision Centigrade Temperature SensorTexas InstrumentsUncategorised
TCA9535PWR(UMW)
TSSOP-24I/O ExpandersUMW
CUS10S30
SOD-323Schottky DiodesDOWO
G6K-2F-Y-5V
SMD,10x6.5mm-40℃~+70℃ 100mW 100mΩ 1A 237Ω 300mA@125VAC、1A@30VDC 3ms 3ms 5V 60V@DC、125V@AC Silver+gold alloy Two groups of conversions: 2C(Double-pole double-throw conversion) SMD,10x6.5mm Signal Relays ROHSOmronSignal Relays
SI2302CDS
SOT-231 N-channel 2.9A 20V 3.5nC@10V,4.5V 550mW 75mΩ@2.5V 850mV N-Channel SOT-23 MOSFETs ROHSVishay IntertechnologyMOSFETs
README
hw/README.md"# step_load"
Parts
212| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | 1K | Resistor_SMD:R_0603_1608Metric | R24, R25, R31, R32, R33, R34, R43, R44, R45, R46, R55, R56, R57, R58, R67, R68 +8 |
| 22 | 10K | Resistor_SMD:R_0603_1608Metric | R17, R18, R19, R20, R21, R30, R39, R40, R41, R42, R51, R52, R53, R54, R63, R64 +6 |
| 21 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3, C12, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33 +5 |
| 19 | CUS10S30 | Diode_SMD:D_SOD-323 | D3, D11, D12, D13, D14, D19, D20, D21, D22, D27, D28, D29, D30, D35, D36, D37 +3 |
| 18 | 10 | Resistor_SMD:R_0603_1608Metric | R26, R27, R35, R36, R37, R38, R47, R48, R49, R50, R59, R60, R61, R62, R71, R72 +2 |
| 18 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D7, D10, D15, D16, D17, D18, D23, D24, D25, D26, D31, D32, D33, D34 +2 |
| 16 | 100 | Resistor_THT:R_Axial_DIN0617_L17.0mm_D6.0mm_P20.32mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16 |
| 16 | G6K-2F-Y | Relay_SMD:Relay_DPDT_Omron_G6K-2F-Y | K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11, K12, K13, K14, K15, K16 |
| 16 | Si2302CDS | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16 |
| 11 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C6, C7, C8, C9, C10, C11, C15, C17, C19 |
| 4 | 10uF | Capacitor_Tantalum_SMD:CP_EIA-3216-12_Kemet-S | C13, C14, C16, C18 |
| 4 | 5K1 | Resistor_SMD:R_0603_1608Metric | R22, R23, R28, R29 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | RST | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1, SW2, SW3, SW4 |
| 2 | LM35DZ | Package_TO_SOT_THT:TO-92_Inline | U1, U2 |
| 2 | NetTie_2 | NetTie:NetTie-2_SMD_Pad0.5mm | NT1, NT2 |
| 1 | AZ1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | B3V6 | Diode_SMD:D_SOD-523 | D4 |
| 1 | BOOT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | DC_IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | DC_IN | Connector_BarrelJack:BarrelJack_Horizontal | J4 |
| 1 | ESP32-C3-WROOM-02 | RF_Module:ESP32-C3-WROOM-02 | U4 |
| 1 | OLED | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J6 |
| 1 | OUTPUT | TerminalBlock:TerminalBlock_bornier-4_P5.08mm | J7 |
| 1 | TCA9535PWR | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U5 |
| 1 | UART | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J2 |
Questions
How big is the Step load PCB?
It measures 160 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Step load use?
212 parts, built around the ESP32-C3-WROOM-02-H4, LM35DZ, TCA9535PWR(UMW) and CUS10S30. 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 Step load KiCad files?
From the AHGure/step_load repository on GitHub, at the commit this page was made from: the board is hw/step_load.kicad_pcb and its schematic hw/relays.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Step load design in my own project?
Its repository states no licence, so its author keeps all rights: ask AHGure before reusing the design.
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