Assistive Technology

Morse Code for Accessibility: Switch Access and AAC

For people who can reliably make only one or two physical movements, Morse code turns a single switch into a full keyboard. Here’s how it works, who built the modern version, and where it fits among today’s augmentative and alternative communication (AAC) tools.

What it is
A way to type or communicate using only one or two switch presses instead of a full keyboard, by encoding letters as short and long signals.
Who uses it
People with limited fine motor control who can reliably operate one or two physical switches, such as a button, sip-and-puff tube, or head movement sensor.
Where it’s built in
Google’s Gboard keyboard has included a Morse code input mode since 2018, on both Android and iOS.
Who helped build it
Tania Finlayson, a switch-access user who communicates in Morse code, partnered with Google to design the Gboard keyboard.
How it differs from scanning
The user sets the rhythm by pressing the switch directly, rather than waiting for a moving cursor to reach the right letter.
Still used today
Yes — in Gboard, in dedicated assistive-switch software, and in hardware like sip-and-puff and head-movement switches.

Why Morse Code Works as an Accessibility Input Method

Morse code represents every letter, number, and punctuation mark using only two signal lengths: a short signal (dot) and a long signal (dash). That two-state design is what makes it useful far beyond radio and telegraphy — it can be produced with almost any input a person can reliably control, including a single button, a puff of breath, a head tilt, or an eye blink. Where a standard keyboard needs a user to accurately target one of dozens of small keys, Morse code only ever asks for one of two actions, repeated in different patterns.

Encoding vs. Scanning: Two Different Approaches to Switch Access

Assistive technology for people with limited motor control generally falls into two families of access method. In switch access scanning, a cursor or highlight moves automatically through rows, groups, or individual items on a grid, and the user presses a switch at the moment it reaches the item they want. It works well, but the user is always waiting on the system’s timing, not their own.

Morse code takes a different approach, sometimes called an encoding method: the user actively produces a pattern of short and long presses that the system decodes into a letter, rather than waiting for a scan to arrive. For someone who can control the timing of their own movements well, that self-paced rhythm can be faster and less mentally taxing than watching and waiting for a scanner — though it requires first learning the code itself, which scanning grids do not.

One Switch or Two: The Basic Setups

Morse-based access typically runs in one of two configurations. In two-switch mode, one switch produces a dot and a second switch produces a dash — the most direct setup, comparable to how a telegraph operator’s key works. In single-switch mode, one switch does both jobs: a short press makes a dot and a longer, held press makes a dash, which is timed and interpreted by the software. Single-switch mode asks for a bit more precision, but it means someone with only one reliable point of physical control can still access the full alphabet.

A Brief History of Morse Code as Assistive Technology

Using Morse code as an accessibility tool is not a recent invention layered on top of an old telegraph code — it grew directly out of the same property that made the code useful in the first place: it can be sent by anyone who can produce two distinguishable signals, whatever those signals are.

Tania Finlayson and Head-Switch Communication

One of the best-documented modern examples is Tania Finlayson, an accessibility advocate with limited speech and motor control who communicates by producing Morse code through a head-operated switch, which software then translates into typed text and, eventually, speech. According to Google’s own account of her story, Finlayson’s husband, Ken, built her a custom device that reads her head movements and converts them into Morse code — assistive hardware and software for Morse-based access, including systems along these lines, is available today under names such as TandemMaster, which supports one-, two-, and three-switch Morse and scanning input for computers, tablets, and communication devices.

Google Brings Morse Code to Gboard

In May 2018, at Google I/O, Google announced it was adding a Morse code input mode to Gboard, its Android keyboard app, in beta. Finlayson worked directly with Google’s team on the feature, and described the result in a statement published on Google’s own accessibility site: “I’m very excited that Gboard now has a Morse keyboard that allows for switch-access, with various settings to accommodate more people’s unique needs.” Google extended Morse input to Gboard on iOS two months later, in July 2018, bringing the same feature to iPhone and iPad users through the Gboard app.

How to Use the Gboard Morse Keyboard Today

The Morse keyboard is part of Gboard, Google’s free keyboard app, and works inside any app you can normally type in, such as Gmail, Notes, or a messaging app.

Setting It Up

After installing Gboard, adding the Morse code layout is done through the keyboard’s language settings — selecting “Morse Code” as an input language makes it available as a keyboard option alongside your other languages, on both Android and iOS. Once selected, the keyboard shows two large input areas for short and long signals in place of a standard key layout, with word suggestions displayed above, the same way Gboard’s regular keyboard does.

Customizing Timing

Because Morse code depends on timing, Gboard’s settings let a user tune the keyboard to their own physical rhythm rather than a fixed standard. A character timeout setting controls how long the keyboard waits before turning a completed sequence of dots and dashes into a letter — it can even be set to “Never,” so the user sends each letter manually by tapping the spacebar instead of waiting for a timeout. A separate word timeout setting controls when a pause is read as the end of a word rather than the end of a letter. A key repeat setting lets a user hold the dot or dash key to repeat it instead of tapping repeatedly, with an adjustable delay before repeating starts. Gboard also integrates with Android’s built-in Switch Access and Point Scan accessibility features, and can provide audio feedback on each keypress.

Other Assistive Hardware That Uses Morse Code

A smartphone keyboard is only one way to produce Morse code with limited movement. The same two-signal principle is built into a range of physical assistive switches, most of which can be paired with Morse-decoding software to control a computer, tablet, or dedicated communication device.

Sip-and-Puff Switches

A sip-and-puff switch is a pneumatic device, usually a tube positioned near the mouth, that registers a short inhale (“sip”) or exhale (“puff”) as a switch press. Paired with Morse-decoding software, a sip can act as a dot and a puff as a dash — or one continuous action can be timed, the same way a single physical button can be — giving someone with control over breath but little or no control over their limbs a path to full text input.

Head-Movement and Eye-Blink Switches

Small sensors — an accelerometer worn on the head, or a camera watching for an eye blink or brief eye closure — can register a deliberate motion as a switch press in the same way a physical button does. These setups are typically slower than a hand-operated switch and depend heavily on how reliably a person can repeat a specific motion, but they extend Morse-based access to people who cannot use their hands or breath control reliably at all.

Dedicated Morse-to-Keyboard Software

Outside of Gboard, standalone assistive-technology software exists specifically to translate switch input into Morse code and then into standard keyboard or mouse commands for a computer. TandemMaster is one example still in active use, supporting one-, two-, and three-switch configurations that can run either scanning or Morse-encoding access, so a single piece of software can serve a person’s needs whether they eventually use scanning, Morse, or a mix of both.

Morse Code vs. Other AAC Access Methods

Morse-based input is one option among several access methods used in augmentative and alternative communication, and it is not automatically the best fit for every user — the right choice depends heavily on someone’s specific physical abilities and how much time they can invest in learning a new code.

Morse encoding

Self-paced — the user sets the rhythm. Requires learning the code first, and depends on being able to reliably control timing, not just presence or absence of a signal.

Switch scanning

No code to learn — items are selected as a scanner reaches them. The user is paced by the scan speed rather than their own rhythm, which can feel slower once Morse is learned well.

In practice, many AAC users and their speech-language pathologists choose based on trial and comparison rather than a fixed rule: someone with strong, repeatable timing control over one or two movements — but who finds waiting on a scanner slow or frustrating — is often the best candidate for Morse-based access, while someone who has more difficulty with precise timing may do better with scanning.

Who This Helps, and Why It Matters

The population that can benefit from alternative access methods like Morse-based typing is large. The World Health Organization estimates that more than 2.5 billion people worldwide need one or more assistive products, a figure it expects to rise to about 3.5 billion by 2050 as the population ages. Within that broader group, WHO estimates roughly 80 million people need a wheelchair, and access to one varies enormously by country. Conditions that can limit someone to one or two reliable points of physical control — including ALS (amyotrophic lateral sclerosis), cerebral palsy, and spinal cord injury — are among the reasons a person might rely on switch-based communication or computer access rather than a standard keyboard or mouse.

Why this is more than a novelty: for someone with very limited reliable movement, the choice of access method can be the difference between independent communication and depending entirely on another person to guess what they need. That’s the practical stake behind a feature like Gboard’s Morse keyboard, not just an interesting use of an old code.

Frequently Asked Questions

Can you really type using only one switch?

Yes. In single-switch Morse mode, a short press produces a dot and a longer, held press produces a dash, so every letter, number, and punctuation mark can be typed using variations in timing on a single switch.

Why does Gboard have a Morse code keyboard?

Google added it in 2018 after working with accessibility advocate Tania Finlayson, who communicates in Morse code through a head-operated switch, to design a keyboard that gives switch-access users a fast, flexible way to type on Android and iOS.

Is Morse code faster than switch scanning for AAC?

It can be, for someone who has learned the code well and has reliable control over timing — because the user sets the rhythm instead of waiting for a scanner. It is not automatically faster for everyone; scanning remains the better fit for users who have more difficulty with precise timed movements.

What conditions might lead someone to use Morse-based access?

Any condition that limits a person to one or two reliable points of physical control can make Morse-based access useful, including ALS, cerebral palsy, and spinal cord injury. The method itself doesn’t require a diagnosis — it requires the ability to reliably produce two distinguishable signals.

Do you need special hardware to use Morse code as an accessibility tool?

No — Gboard’s Morse keyboard works with a phone or tablet’s touchscreen alone. Dedicated switches such as sip-and-puff devices, head-movement sensors, and software like TandemMaster extend Morse-based access to people who can’t reliably use a touchscreen directly.

Is switch-access Morse code the same as ham radio Morse code?

The underlying code is identical, but the goal is different. Ham radio operators use Morse code (CW) to communicate over radio; see our Morse Code for Ham Radio guide for that side of it. Switch-access Morse code uses the same dot-dash alphabet to give someone with limited movement a way to type or communicate at all.

Explore More

Where Is Morse Code Still Used Today?→ Morse Code Alphabet & Chart→ Morse Code for Ham Radio (CW)→ How to Send Morse Code by Tapping or Blinking→ The History of Morse Code→ Morse Code Guide: What It Is & How It Works→

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