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Controlling a Telescope over WiFi using SkySafari on Android

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Step-by-Step Setup Guide
Tested with SkySafari Plus 4.0.7 on ASUS tablet TF701T with Android 4.4.2 (KitKat)
using a Celestron NexStar SLT telescope mount.

The Setup

The setup is fairly simple and looks like shown below. The serial Wi-Fi adapter is connected to the hand control (serial port based only) via a RJ11 to DB9 female cable. The hand control is then connected to the telescope mount.

SkySafari controlling telescope on Android

A look at the parts you need

Below is a list of parts we use for this setup; some are required, some are highly recommended and some are optional.


This is needed to connect to the telescope.

serial wifi adapter
Serial WiFi adapter
part UCW232C

Standard adapter

RS232 / RJ11 Cable
part 93920

Available from

This cable is used for connecting the serial Wi-Fi adapter to the hand control.

usb battery
Rechargable USB Battery
part 206647

This rechargeable lithium USB battery pack is optional but very useful if you have no other power source for the serial WiFi adapter.

Connecting the Serial Wi-Fi adapter

The UCW232C serial to WiFi adapter is pre-configured to work with most astronomy software including SkySafari, so you don’t need to configure any of the adapter’s parameters. All parameters should be at default settings. To make sure all parameters are at default settings you can press and hold the reset button for about 5 seconds.

Connecting the adapter to your Android device over Wi-Fi.
First connect the Wi-Fi adapter to 5VDC through the USB power port. Check that the DCE/DTE switch on the side of the adapter is in position DTE.
Go to your Android device’s Wi-Fi settings page and search for WiFi devices. Connect to the adapter, the SSID is “Serial2WiFi_xx_xx”, (the xx_xx is the last 4 digits of the adapter’s MAC address):

Android WiFi settings


Android connected to WiFi adapter


Align your telescope now!
The WiFi adapter cannot connect to your telescope if it is not successfully aligned.


Connecting with SkySafari

Connect the serial Wi-Fi adapter to the hand control using the DB9/RJ11 cable and the male/male gender changer as shown below. NOTICE: The DCE/DTE switch on the side of the adapter must be in position DTE.

Telescope connection

Install and open SkySafari on your Android device. On the main screen tab the Settings menu.
Select telescope and mount type under the Telescope menu. Select Connect via Wi-Fi under Communication Settings and enter the WiFi adapters IP address ( and port number (8080):

SkySafari WiFi adapter settings

Go back to the main menu and tab the Scope menu, and tab Connect:

SkySafari connecting to WiFi adapter

You are now able to select any star on the screen and tab “GoTo” and the telescope will slew to the selected star:

SkySafari connected to WiFi adapter