BY VIEWCAST    UPDATED April 1, 2026

| Version | 2.660 |
| Size | 4.4 MB |
| What's New | Revert Bluetooth changes |
OnStep Controller2 is an innovative app designed to enhance the functionality of the OnStep controller for telescopes. With its robust features, it serves as a potent tool in the arsenal of astronomy enthusiasts. Whether you're replacing a Smart Hand Controller or Smart Web Server (Wemos), OnStep Controller2 stands out due to its seamless integration with internal Bluetooth when using ESP32S in your setup.
One of the standout advantages of OnStep Controller2 is its comprehensive support for polar alignment and smart tracking correction. These features ensure that your telescope is always accurately pointed at your celestial target, making your stargazing experience more precise and enjoyable.
OnStep Controller2 boasts several key features that make it a valuable tool for amateur astronomers:
OnStep Controller2 offers substantial value, though there's always room for improvement. A notable feature that could enhance the app is the addition of a polar hour angle calculator, which would streamline the polar alignment process even further.
Additionally, while the current interface allows for effective control, incorporating a slide bar to manage the focus tube alongside traditional buttons could provide users with a more intuitive control method. Minor adjustments, like fine-tuning the UTC offset settings, could also elevate the user experience by ensuring universal compatibility and accuracy.
One of the best aspects of OnStep Controller2 is its seamless integration with the open-source OnStep telescope controller software. This combination allows hobbyists to convert even basic mounts into advanced GoTo mounts with minimal investment. The collaboration within the community, highlighted by significant contributions from enthusiasts like Howard, Khalid, and David, has made high-precision astronomy accessible to more people.
The OnStep community continually works on improving the app. Users have suggested useful features like control over Wi-Fi, which would add more flexibility to how the telescope can be managed remotely. The active involvement of the community ensures that OnStep Controller2 evolves to meet the needs of its users.
OnStep Controller2 is an app designed to control telescopes using the OnStep controller hardware. It supports features like polar alignment correction and smart tracking to improve telescope accuracy.
Yes, if you're using an ESP32S in your setup, the app can utilize internal Bluetooth, eliminating the need for extra hardware.
While already robust, adding a polar hour angle calculator and options like a slide bar for focus control could further enhance its functionality.
OnStep Controller2 works in tandem with the open-source OnStep telescope controller software, enabling users to convert basic mounts into advanced GoTo mounts affordably.
To use OnStep Controller2, you'll need a telescope setup with OnStep controller hardware. For optimal functionality, ensure your system supports Bluetooth or consider ESP32S for seamless integration.
In conclusion, OnStep Controller2 is an indispensable tool for any astronomy enthusiast looking to enhance their stargazing experience. With its powerful features and continuous development driven by community feedback, it represents a significant leap forward in the world of telescope control.
OnStep Controller2 is primarily a mobile app designed for smartphones. However, you can run OnStep Controller2 on your computer using an Android emulator. An Android emulator allows you to run Android apps on your PC. Here's how to install OnStep Controller2 on your PC using Android emuator:
Visit any Android emulator website. Download the latest version of Android emulator compatible with your operating system (Windows or macOS). Install Android emulator by following the on-screen instructions.
Launch Android emulator and complete the initial setup, including signing in with your Google account.
Inside Android emulator, open the Google Play Store (it's like the Android Play Store) and search for "OnStep Controller2."Click on the OnStep Controller2 app, and then click the "Install" button to download and install OnStep Controller2.
You can also download the APK from this page and install OnStep Controller2 without Google Play Store.
You can now use OnStep Controller2 on your PC within the Anroid emulator. Keep in mind that it will look and feel like the mobile app, so you'll navigate using a mouse and keyboard.

