2 layers157.5 × 25.4 mm Stepper motor controller, the printed circuit board in 3D

Stepper motor controller

Size: 157.5 × 25.4 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 50
Nets: 31
Pads: 268
Tracks, vias: 729, 45
Pours: 11
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 18 Aug 2024
Updated: 8 Nov 2025

Overview

Stepper motor controller is an open-source printed circuit board by ethanjamesauto, from the ethanjamesauto/modular_8bit_computer repository on GitHub. It is a 2-layer board of 157.5 × 25.4 mm with 50 parts on 31 nets, routed with 729 tracks and 45 vias.

It is built around the NE555D, 74LS00SC and 74LS74PC, with the FDG1024NZ among its other parts. Its parts include 20 ICs, 10 capacitors, 10 resistors, 4 transistors and 4 connectors. It belongs with the robots and motor control boards of this library.

Main components

README

README.md

Modular 8-bit Computer

This is the repository for an 8-bit computer system that is built using cards with a standardized interface.

CPU card
Protoboard card
- This card contains an onboard clock generator, address and data registers/buffers, and a protoboard area for testing designs.
Bus interface modeling

Here's an example of a card:

Current Bus Specification

verilog

// The main bus wires (32+8=40 wires total)
// On the bus connector, all buses have LSBs closer to the power pins and MSBs farther away
wire VCC_5V;
wire GND;
wire clk;			      // generated by motherboard clock generator
wire rst_n;			    // probably a button on the motherboard
wire VCC_3V3;
wire we_n;			      // active LOW
wire oe_n;			      // active LOW
wire int_n;			    // pulled up by motherboard; driven down by any peripheral (could be used for interrupts)
wire [7:0] data;
wire [15:0] addr;	  // 64k address space is suppored by default. More address bits may be added later
wire [7:0] aux_bus;

Parts

Qty	Value	Footprint	References
16	NE555D	Package_DIP:DIP-8_W7.62mm	U4, U5, U6, U7, U8, U9, U10, U11, U12, U13, U14, U15, U16, U17, U18, U19
10	1uF	Capacitor_SMD:C_0603_1608Metric	C1, C2, C3, C5, C6, C7, C8, C18, C19, C20
6	470	Resistor_SMD:R_0603_1608Metric	R1, R2, R3, R4, R6, R7
4	10k	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal	R5, R8, R11, R14
4	Conn_01x04_Pin	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J1, J2, J3, J4
4	FDG1024NZ	Package_TO_SOT_SMD:SOT-23-6_Handsoldering	Q1, Q2, Q3, Q4
3	74LS00	Package_DIP:DIP-14_W7.62mm	U2, U3, U20
2	LED	Resistor_SMD:R_0603_1608Metric	D1, D2
1	74LS74	Package_DIP:DIP-14_W7.62mm	U1

Questions

How big is the Stepper motor controller PCB?

It measures 157.5 × 25.4 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Stepper motor controller use?

50 parts, built around the NE555D, 74LS00SC, 74LS74PC and FDG1024NZ. 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 motor controller KiCad files?

From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is stepper_motor_controller/stepper_motor_controller/stepper_motor_controller.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Stepper motor controller design in my own project?

Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.

Category and platform

Robots and motor control

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/ethanjamesauto-modular-8bit-computer-stepper-motor-controller" title="Stepper motor controller in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/ethanjamesauto-modular-8bit-computer-stepper-motor-controller.jpg" alt="Stepper motor controller" width="1200" height="900">

A picture that opens the board, for a README

[![Stepper motor controller](https://pcbkit.io/embed/boards/ethanjamesauto-modular-8bit-computer-stepper-motor-controller.jpg?size=s)](https://pcbkit.io/boards/ethanjamesauto-modular-8bit-computer-stepper-motor-controller)

Source

Repository: ethanjamesauto/modular_8bit_computer
Board file: stepper_motor_controller/stepper_motor_controller/stepper_motor_controller.kicad_pcb
Commit: 4215150
Licence: Not stated

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