Seletek family — WiFi focuser controller
WiFi & USB. Control from your smartphone.
The Limpet is the compact member of the Seletek focuser family. Tiny enough to attach directly to your telescope with a single screw, it connects via WiFi or USB and lets you control your focuser from any browser — on your phone, tablet or computer.
The Limpet was designed to sit directly on the focuser, not in an equipment box. Everything about it — its shape, its connector, its power draw — serves that goal.
Connects to your observatory WiFi network, or creates its own access point if you prefer a direct connection. No router required.
Open the Limpet's web interface on your phone, tablet or laptop — no app to install. Navigate to its IP and you're in control.
One central hole for a single mounting screw. Attach the Limpet directly to the telescope tube or focuser body — it stays put without a separate enclosure.
Weight <85 gExtremely low power draw when idle over WiFi. Barely touches the battery, even in a fully remote setup running all night.
12V DC · 530 mA focusing (standard motor)The 2.1×5.5 mm power connector locks with a screw. No accidental disconnections during a session — particularly useful when mounted on a moving telescope.
All the same functions via USB cable. Use WiFi for remote setups and USB when at the telescope — ASCOM drivers cover both equally.
The Limpet's four power outputs and three analog inputs give it a focused but versatile I/O set for telescope automation.
Drive the main telescope focuser directly. Precise stepper motor control with position tracking and limits.
Can alternatively control an instrument rotator using the Windows software — swap functions without buying additional hardware.
Optional external temperature sensor (one of the three analog inputs) for temperature compensation of the focuser position.
Up to 1.5A per output with thermal auto-shutdown protection. Two of the inputs include resettable fuse protection.
The Limpet is part of the Seletek software ecosystem. The same Windows application and third-party drivers cover the whole family.
The Seletek Windows application supports the Limpet natively. Full ASCOM focuser and rotator drivers included for use with any ASCOM-aware software.
INDIGO focuser, rotator and power box drivers bring the Limpet to Linux and macOS — including Raspberry Pi observatory setups.
INDIlib focuser driver available for the Limpet, for use with INDI-based setups on Linux.
Two screens — Control and Config — keep it simple. Access from any device on the same network, no installation required.
Home — The Limpet's web interface opens with its recognisable mascot and direct navigation to Config or Control.
Config — Full configuration panel as seen on a smartphone: motor parameters, limits, network settings and temperature sensor.
Control — landscape — The control panel in landscape orientation. Position display, step size selector, direction controls and current temperature.
Control detail — Position counter and step controls close-up.
Config detail — Motor configuration and limit switch settings.
| Dimensions | 70 × 70 × 26 mm |
| Weight | <85 g |
| Power supply | 12V DC (13.8V compatible) |
| Connector | 5.5 / 2.1 mm screw-locking jack |
| Power at idle | 30 mA (WiFi connected) |
| Power focusing | 530 mA (standard motor) |
| Outputs | 4 digital (up to 1.5A each, thermal shutdown) |
| Inputs | 3 analog-digital (1 temp sensor, 2 fuse-protected) |
| Connection | WiFi + USB |
| Mounting | Central hole, single screw |
| Windows software | XP, Vista, 7, 10 (32 & 64-bit) |
| ASCOM | Focuser & rotator drivers |
| Linux / macOS | INDIGO drivers |
| Linux | INDIlib focuser driver |
| Web interface | Any browser, no install |
| Compatible with | FocusMax, MaximDL, CCDCommander, ACP, CCD AutoPilot, SGPro, Voyager, APT … |
Free shipping to most countries on direct orders. · Dealers worldwide →
The Limpet shares the Seletek software and firmware ecosystem. All downloads are in the shared Seletek downloads page.
PDF guide to get the Limpet up and running — hardware setup, WiFi connection and first focus run.
Download PDF →Seletek Software v4.8 (Windows, includes Limpet support), firmware and USB drivers for all platforms.
Go to downloads →Mounting guide for focusers that use the Lunatico custom coupling plate — Optec, JMI, and compatible models.
Read guide →