2 layers84.5 × 54.6 mm
Main board v2
felixzero/escrocs
Repository for the ESCROCS team for the french robotics cup 2020!
75 parts7GPL-3.0
2 layers58.4 × 41.7 mm
Stepper board
felixzero/escrocs7Repository for the ESCROCS team for the french robotics cup 2020!
- Size
- 58.4 × 41.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 81
- Nets
- 80
- Pads
- 334
- Tracks, vias
- 824, 46
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 Oct 2019
- Updated
- 28 May 2025
Overview
Stepper board is an open-source printed circuit board by felixzero, from the felixzero/escrocs repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 58.4 × 41.7 mm with 81 parts on 80 nets, routed with 824 tracks and 46 vias.
It is built around the ATMEGA168PA-AU, DRV8811PWP and ULN2003. Its parts include 28 resistors, 27 capacitors, 5 ICs, 1 connector and 1 crystal. It belongs with the robots and motor control boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATMEGA168PA-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 16KB 1KB 20MHz 23 512Byte 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DRV8811PWP
HTSSOP-28-EP-40℃~+85℃ 1.9A 1Ω 1、2、4、8 2 3V~5.5V 8V~38V Bipolar Driver Overcurrent Protection、Over temperature protection、Under-voltage lockout、Motor step-out prevention function、Dead-time / shoot-through protection STEP/DIR Yes HTSSOP-28-EP Stepper Motor Driver ROHSTexas InstrumentsStepper Motor Driver
ULN2003
SOP-161.1V@250uA,100mA 25pF 2V 30V 500mA 50uA 50uA Seven channels SOP-16 Darlington Transistor Arrays ROHSBLDarlington Transistor Arrays
README
CAD/electrical/stepper_board/README.mdStepper board
A board, based on an ATMega168PA, meant to control up to 3 1.5A bipolar steppers (the most common kind, used in 3D printers for instance). It can also control up to 3 12V pumps.
Its code is in the code/stepper_board folder.
Known issues
The steppers stay actively driven all the time. Over prolonged use of time, the card can get really hot, we recommend to use heatsinks on the stepper drivers.
A workaround to permit the microcontroller to switch off the drivers is the set the fuse in such a way that the RESET pin is a regular I/O of the ATMega and let the ATMega hold RESET down when the steppers are not in use. Beware: doing so will prevent reflashing the board.
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R3, R6, R10, R11, R14, R28, R30, R31, R34 |
| 9 | 220n | Capacitor_SMD:C_0603_1608Metric | C4, C5, C6, C10, C11, C12, C28, C29, C30 |
| 6 | 0.1 | Resistor_SMD:R_1206_3216Metric | R7, R8, R15, R16, R35, R36 |
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C7, C13, C15, C17, C25 |
| 6 | 1n | Capacitor_SMD:C_0603_1608Metric | C2, C3, C8, C9, C26, C27 |
| 6 | 47k | Resistor_SMD:R_0603_1608Metric | R1, R4, R9, R12, R29, R32 |
| 3 | 33k | Resistor_SMD:R_0603_1608Metric | R5, R13, R33 |
| 3 | 470 | Resistor_SMD:R_1206_3216Metric | R25, R26, R27 |
| 3 | DRV8811 | Package_SO:HTSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.85x5.4mm_ThermalVias | U2, U4, U5 |
| 3 | Stepper | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | St.0, St.1, St.2 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric | C16, C19 |
| 2 | 10u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C14, C18 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric | C20, C24 |
| 1 | 12V | LED_SMD:LED_0603_1608Metric | 12V |
| 1 | 12V | Connector_BarrelJack:BarrelJack_Horizontal | J3 |
| 1 | 5V | LED_SMD:LED_0603_1608Metric | 5V |
| 1 | ATmega168PA-AU | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | Crystal | Crystal:Crystal_SMD_HC49-SD | Y1 |
| 1 | Home 0 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | Home 0 |
| 1 | Home 1 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | Home 1 |
| 1 | Home 2 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | Home 2 |
| 1 | I2C | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | I2C |
| 1 | ISP | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | ISP |
| 1 | Pump 0 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | Pump 0 |
| 1 | Pump 1 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | Pump 1 |
| 1 | Pump 2 | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | Pump 2 |
| 1 | RESET | Button_Switch_THT:SW_PUSH_6mm | RESET |
| 1 | ST | LED_SMD:LED_0603_1608Metric | ST |
| 1 | ULN2003 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U3 |
The 77 most common of 81 parts.
Questions
How big is the Stepper board PCB?
It measures 58.4 × 41.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stepper board use?
81 parts, built around the ATMEGA168PA-AU, DRV8811PWP and ULN2003. 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 Stepper board KiCad files?
From the felixzero/escrocs repository on GitHub, at the commit this page was made from: the board is CAD/electrical/stepper_board/stepper_board.kicad_pcb and its schematic CAD/electrical/accessory_board/accessory_board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stepper board design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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