Meet OG Star tracker - The ultimate diy star tracker

DIY – Build Your Own Tracker !

So, you want to build your own tracker. Then you are at the right place. OG star tracker is a perfect tracker and project for beginners and experienced astrophotographers. Combining ease of use with high precision while being open source.

Key Features:

• Lightweight & Portable: Weighs just 1.4 kg
• High Accuracy: Periodic error of just 10″–15″, allowing long exposures without an auto guider.
• Modular & Customizable: Swap between a laser and polar scope, add a ball head, or even upgrade with a manual declination axis.
• Easy Polar Alignment: Simply aim the laser at Polaris—no need for a polar scope.
• Advanced Camera Control: Built-in intervalometer port with dithering support for noise reduction.
• Upgradable: Soon a manual go-to upgrade will be released.
• Open and free to share modify and make.

You can now buy the kits and parts at OG star tech.

If you live in china you can buy  them at taobao.

Shot on OG star tracker

30s exposures 2.5h of exposure time.

Join our comunity

Discord : [https://discord.gg/dyFKm79gKJ](https://discord.gg/dyFKm79gKJ)

QQ: QQ交流群

Built instruction

Github : [https://github.com/OndraGejdos/OG-star-tracker-](https://github.com/OndraGejdos/OG-star-tracker-)

List of parts : [https://docs.google.com/spreadsheets/d/1V04zjGSebJ5LQbSmzs-h86T6Z9E3HwVkMj2nuVYQzYs/edit?usp=sharing](https://docs.google.com/spreadsheets/d/1V04zjGSebJ5LQbSmzs-h86T6Z9E3HwVkMj2nuVYQzYs/edit?usp=sharing)

My website : [http://www.ogstartech.com](http://www.ogstartech.com)

List of parts for 3d printing : [https://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharinghttps://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharing](https://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharinghttps://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharing)  
Assembly guides: 

Printing instructions

Uploaded print ptofiles

I have uploaded here print profiles fo the tracker. One set of print profiles are for bambulab printers with ams or without. These print profiles are compatible with our hw kits or if you have bought all of the parts from part list. If you don't have compatible printers or you are using diffrent parts follow the print guide down.

Recomended print settings

All parts are printed with 100% infill except a few parts.

Print from cheaper abs/asa material:
Main gearbox , Gearbox part 1 bearing holder, Tightener, Big pulley, Camera holder, middle holder, belt cover, tightener, tightener bottom, bearing holder, bearing holder cover, bottom bearing holder, M5 knob big, Laser holder 14mm, tightener for polar scope laser, polar scope holder eq5, middle holder bottom, stationary part with 3 8 threaded insert, m5 knob 2x, m5 small knob 2x

Multicolor prints:
Main gearbox - 2x 3 white dots for tensioning, logo, bottom text
arc left - white numbers of latitude, print lying on bed
arc right - white numbers of latitude, print lying on bed

(The engravings are very shallow)

turn on ironing on top layers on these models:

Middle holder bottom

Stationary part (Use 4 walls)

Use better material abs-gf/asa-cf
Main top part, Main bottom part, Arc left, Arc right

Special printing parameters:
Main pulley - use random z seam and scarf joint seam

Stationary part (Use 4 walls)

Parts that you can print with 50% infill 
Middle holder bottom, Stationary part (use 4 walls) , M5 knob, M5 knob big, Side M3 knob

You can select files which you need to 3d print here : [https://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharinghttps://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharing](https://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharinghttps://docs.google.com/spreadsheets/d/1WuAHm6aZfxG0zdhcmhc4xp2cmE2E53lkToNg1eQ2wvI/edit?usp=sharing)  

For heavy duty version

Use allways 100% infill

Firmware

You need to chose firmware based on your stepper motor. If you have stepper motor which has 400 steps per revolution chose : firmware simple for Arduino nano 0.9° . If you have 200 step per rotation stepper motor use : firmware simple for Arduino nano 1.8° . If you want to use different Arduino you might want to change out pins in code.

[https://github.com/OndraGejdos/OG-star-tracker-/tree/main/Firmware](https://github.com/OndraGejdos/OG-star-tracker-/tree/main/Firmware)

Or you can use our newly developed pcb to unlock more features. 

[https://github.com/OG-star-tech/OG-star-tracker-/tree/main/esp32_wireless_control/firmware](https://github.com/OG-star-tech/OG-star-tracker-/tree/main/esp32_wireless_control/firmware)

Usage 

In the attachment is an instruction manual.

Let me introduce you to OG star tracker V2

Specifications:

• Weight: 1.4 kg
• Max Payload: 4 kg /6kg for heavy duty version 
• Max Focal Length: 400 mm
• Control: Via app or phone web app
• Power: 5V 1A power bank
• Stepper Motor: High-accuracy 0.9° stepper motor with TMC2209 driver
• Build Material: ABS-GF and ABS
• Dimensions: 17.5 × 19 × 11.5 cm

Legacy version here : [https://makerworld.com/en/models/1926665-og-star-tracker-legacy-old-version](https://makerworld.com/en/models/1926665-og-star-tracker-legacy-old-version)