Can I control a tablet or computer with an external switch?

If your device is an Android tablet or phone, Android’s Switch Access can scan and highlight items on the screen so you can select them with one or more switches. The documented input options include external switches that send keystrokes over USB or Bluetooth, and standard USB or Bluetooth keyboards with keys assigned to actions. [S1]

That does not mean every switch works with every device, or that the same feature and steps are available on every computer platform. The Android guidance here does not establish compatibility for other operating systems. Before choosing a switch, identify the device model and operating system, then check whether the switch connects in a way your device supports.

First, find out whether the switch sends keystrokes and whether it connects by USB or Bluetooth. Those are the connection types named in the Android guidance for external switches. A standard USB or Bluetooth keyboard is another listed option; its keys can be assigned to Switch Access actions. [S1]

If you are considering a built-in device button as a switch, note that Google describes that use as intended for developers, rather than presenting it as a general setup recommendation. [S1] Avoid assuming that a connector, adapter, or switch is supported just because it physically fits. Check compatibility with the device and switch documentation, or ask the device or switch provider. The Android guidance does not give a universal compatibility list.

A practical sequence based on Android’s setup guidance is:

1. Connect the external switch or keyboard using USB or Bluetooth.
2. Open Settings, then Accessibility, then Switch Access. The precise menu names or locations may differ on your device.
3. Open Switch Access settings and choose scanning settings and switch assignments.
4. Check whether the screen highlights items as expected and whether the assigned switch selects them.

Android’s guide describes one-switch auto-scanning. It also notes that some setup steps require screen touch, so do not assume you can complete every part using the switch alone. Instructions and menus can vary across Android versions and devices. [S2] If a step is unavailable or the switch is not recognized, check the device-specific guidance rather than guessing at a workaround.

Write down what you know before changing settings, then use a small test to confirm the basics. For example, as a hypothetical plan: “Device: [Android tablet model and version]. Input: [USB or Bluetooth switch that sends keystrokes]. Goal: move through highlighted items and select one. Setup helper: [person who can use touch if a step requires it].” These placeholders are prompts, not a compatibility guarantee.

Start with the scanning choice that fits how you intend to operate the device, and assign an input only after checking the options shown in Switch Access settings. The cited setup guide mentions one-switch auto-scanning, but it does not establish which scanning method is best for an individual or whether a particular switch will work. If you need help choosing, bring the device and switch details to the relevant support provider and ask which connection and setup steps they recommend.