Project Hub /Robotics & Autonomous Systems/Motor Drivers & Motion Control/Barn Door Star Tracker: all-metal version

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ARDUINO

₹5,000 – ₹15,000

1 – 2 Days

Partial Kit

Barn Door Star Tracker: all-metal version

An all-metal, compact, and rigid barn-door star tracker controlled by an Arduino Nano to compensate for variable drive rates.

Originally published on Hackaday.io

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino Nano C Type V3 ATMEGA328 with Soldered Headers Rs. 608.00
A4988 driver Stepper Motor Driver Rs. 125.00
ESP32 CAM WiFi Module Bluetooth with OV2640 Camera Rs. 810.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Thyristor / SCR / Triac / Varistor / Fuse
Screws / Nuts / Standoffs / Hardware
Metal stock (for lathe
milling)

Browse all components

How It Works

The Barn Door Star Tracker: all-metal version is a precision motion control system designed to counteract the Earth's rotation for astrophotography. At the heart of the system is an Arduino Nano, which runs custom C++ microcontroller firmware compiled via the Arduino IDE. The firmware calculates exact step timing sequences to drive a stepper motor. This motor is mechanically coupled to a linear leadscrew, converting rotational motion into linear displacement. The entire mechanical assembly relies on custom-machined metal stock (crafted via lathe or milling), heavy-duty hinges, and bearings to form a rigid two-plate hinged platform, often called a barn-door mechanism. When a DSLR camera is mounted on the top plate, the stepper motor drives the leadscrew to push the plates apart at a precise, variable rate. By matching the sidereal rate at which stars appear to move across the night sky, the tracker keeps the DSLR camera's sensor aligned with a target celestial object, preventing star trailing during long-exposure photography.

Why Build This

Design and implement a closed-loop mechanical motion system utilizing precision leadscrews, custom-machined metal stock, and stepper motors for astronomical tracking.

Develop advanced microcontroller firmware in C++ to compute non-linear step timing algorithms capable of correcting tracking errors inherent in single-hinge mechanical geometries.

Capture high-clarity, long-exposure photographs of deep-sky objects and star fields using a DSLR camera without optical tracking artifacts.

Real-World Application

Used by amateur astronomers and astrophotographers to capture long-exposure photographs of stars and deep-sky objects without star trailing caused by Earth's rotation.

Skills You'll Learn

Stepper motor control

microstepping configuration

precision mechanical assembly

leadscrew motion conversion

custom C++ microcontroller firmware development

trigonometry for motion compensation

lathe and milling machining techniques

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ASTROPHOTOGRAPHY

STEPPER MOTOR

MICROCONTROLLER

METAL MACHINING

LATHE

MILLING

TRIGONOMETRY

OPEN-LOOP CONTROL

Frequently Asked Questions

Why is an all-metal construction necessary instead of 3D-printed plastic or wood?

Astrophotography requires extreme mechanical rigidity to prevent flexure or sagging under the weight of a DSLR camera during long exposures, which would otherwise ruin tracking accuracy.

What is the role of the Arduino Nano in this system?

The Arduino Nano executes custom C++ firmware that precisely times the electrical pulses sent to the stepper motor, ensuring the linear leadscrew moves at the exact variable rate required to track celestial objects.

Do I need prior machining experience to build this tracker?

Yes, because the project specifies the use of metal stock that requires milling and lathe work to fabricate the structural components, hinges, and bearing mounts accurately.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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