Unipolar stepper driver

soghayarmahmoud·unipolar-stepper-driver-pcb·Hardware/Stepper_Motor_Driver.kicad_pcb

Unipolar stepper driver PCB layout, top view — open source board by soghayarmahmoud

About the Unipolar stepper driver PCB

Unipolar stepper driver is an open source PCB design by soghayarmahmoud, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 88.2 × 73.8 mm, with 22 components from 11 distinct parts.

Other key parts include the NE555D, 7407 and 74LS194. By type, the board carries 5 resistors, 4 transistors, 4 diodes, 3 ICs, 2 connectors and 2 capacitors.

It belongs with the robotics & motion designs in this gallery.

From the project

Open-source Unipolar Stepper Motor Driver PCB designed in KiCad. Features hardware-level logic (NE555 & 74LS194) and robust high-current isolation.

This repository documents a fully discrete, hardware-logic-based unipolar stepper motor driver implemented as a two-layer PCB designed in KiCad 8.0. The design deliberately eliminates any dependence on a microcontroller or programmable device, instead realizing the sequencing, direction-control, and power-switching functions entirely through classical digital and analog ICs operating in open-loop.

Unipolar stepper driver, from the project README — From the project README

Main components on the Unipolar stepper driver

NE555D 7407 74LS194

Unipolar stepper driver bill of materials (BOM)

22 components, 11 distinct parts.

Qty	Part	Footprint	Refs
1	NE555D	SOIC-8_3.9x4.9mm_P1.27mm	U1
1	7407	DIP-16_W7.62mm	U2
1	74LS194	DIP-14_W7.62mm	U4
4	TIP120	TO-220-3_Vertical	Q1, Q2, Q3, Q4
1	Conn_01x05	TerminalBlock_Phoenix_MKDS-1,5-5-5.08_1x05_P5.08mm_Horizontal	J1
1	Conn_01x03	TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal	J2
1	1M	Potentiometer_Bourns_3386P_Vertical	RV1
1	SW_Push_DPDT	SW_CK_JS202011CQN_DPDT_Straight	SW1
4	1N4001	D_DO-41_SOD81_P10.16mm_Horizontal	D1, D2, D3, D4
2	0.01uF	C_Disc_D5.0mm_W2.5mm_P5.00mm	C1, C2
5	1K	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R2, R3, R4, R5, R6

Unipolar stepper driver design files

The KiCad project lives in the soghayarmahmoud/unipolar-stepper-driver-pcb repository on GitHub; these links point at the commit this page was built from.

LayoutHardware/Stepper_Motor_Driver.kicad_pcb
SchematicHardware/Stepper_Motor_Driver.kicad_sch

Unipolar stepper driver: common questions

How big is the Unipolar stepper driver PCB?

The Unipolar stepper driver measures 88.2 × 73.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Unipolar stepper driver?

22 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the Unipolar stepper driver design files?

From the soghayarmahmoud/unipolar-stepper-driver-pcb repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Unipolar stepper driver design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which soghayarmahmoud chose for the repository.

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