Skip NavigationMenu

Motorised Drawing Arm

Create adaptable tactile graphics with ease

The Motorised Drawing Arm (MDA) by Thinkable is a computer-driven motorised arm that draws tactile graphics by mechanically moving a stylus across the surface of the TactiPad drawing board. It aims to combine the accuracy of the digital tactile graphics from the TactileView software with the versatility of drawing by hand on the TactiPad drawing board.
This versatile product opens up the possibility to explore, understand and enjoy an emerging tactile diagram that develops under your fingertips.

MDA with TactiPad


The motorised drawing arm (MDA) is a sophisticated add-on for the TactiPad drawing board. It opens up new use cases for the creation of tactile graphics in educational, professional and recreational settings.
The general product lay out and features incorporated for the placement of the TactiPad, ensure a smooth user experience. The design allows the user to manual adding to the image sketched on the TactiPad, or have a second sketch added by the MDA.
For operation under various circumstances the MDA has several connectivity options such as: USB, a WiFi hotspot or connecting to a (wireless-)network.
Once a WiFi connection is established between a mobile phone, a tablet or a computer and the MDA, the built-in interface is accessible with a browser.
On the page Examples and Interactive an existing image can be selected for immediate sketching. More images can be created with the TactileView software or with one of the numerous third party programs.
The users of the MDA can also establish their community of designers to help out with the creation of personalised images. The system enables that users describe in text the specific content for the image they need.
The functionality built on top of the technical specifications prove that the MDA/TactiPad combination takes a unique position in the range of products for creating and exploring tactile graphics.

Sophisticated add-on

The overall understanding is that by manually adding to a raised line drawing, sketched by the MDA, visually impaired users will increase their engagement with tactile graphics, as well as increase their capability to understand and create tactile graphics themselves.

The MDA quickly and accurately creates raised line drawings with its motorised stylus on the TactiPad. Once an image has been sketched, more information can be added manually or by placing the TactiPad back on the MDA to sketch a next layer.

In some cases it’s necessary to have multiple TactiPads with the same image. This can be quite tedious to do by hand, but becomes easy to do with the MDA by repeating the last sketch.

The MDA makes use of the wide spread scalable vector graphics (SVG) file format. A number of SVG files are already stored on the MDA. Additional files can be uploaded or retrieved from an inserted USB-drive.

Manually adding to a sketch


Examples of applications of the MDA

Education icon Education, schoolwork and exams

A teacher creates a task in which a tactile diagram is involved. This can both serve as a means to provide information and as a template in which the exercise is made. By dividing the exercise into several consecutive steps, tactile graphics become easier to understand and create a dynamic interaction.

  • Participate in the classroom by sketching (‘printing’) images from the smartboard or handheld devices on the TactiPad (or multiple TactiPads simultaneously).
  • Create a map and add step-by-step topographic or geographic information.
  • Study graphs, geometry, physics diagrams, read and process values, etc.
  • Use the MDA as a document reader for images in schoolbooks.

Fun and games icon Fun and games

  • By allowing you to manually add to a sketched image, a wide range of games and puzzles becomes accessible.
  • Print simple designs from the TactileView catalog, such as animals and flowers, as a source for kids to have fun with discovering shapes and drawings.
  • Print simple objects and draw a copy to learn the basics of drawing.
  • Sketch a partly finished drawing and have it finalised.
  • Produce fun drawings with games such as ‘Connect the dots’.

Professional use icon Professional use

  • Produce schemes for work flow, statistical information, graphs etc.
  • Use it as an aid for communication with colleagues.
  • Sketch the images in textbooks based on the MDA.

More MDA content examples 

General product layout

The top layer of the MDA is made of the same material as the TactiPad and therefor has the same tactile properties and rich contrast colours: yellow and black.

To give it its sturdiness, aluminium plates form the foundation for the mechanical parts.

The unit is highly suitable to be used on a table/desk. The user can sit in front of the MDA even while it is sketching.

Two motors that move the arm forwards and backwards are housed underneath the bed of the MDA. The two motors that operate the stylus up and down and from left to right are housed inside the moving arm. The motors create little noise ensuring that the MDA can be used in settings where too much noise is undesirable. Caution is required when the arm is moving. Make sure that no objects or hands are obstructing the path of the arm.



Placement of the TactiPad

The MDA’s bed is just as wide as the TactiPad is in landscape position. The rounded front corners of the MDA line up with those of the TactiPad, making it easy to confirm, with touch, the correct placement of the TactiPad.

Lifting the TactiPad up is easy due to the indentations along the front, left and right side of the bed.

Six black anchors can be found on the bed. They are shaped in such a way that the TactiPad will naturally slide into one of two fixed positions. The four anchors nearest to the front panel hold the TactiPad in the horizontal (landscape) position, while all six are covered when the TactiPad is in its vertical (portrait) position. The front side of the MDA aligns with the TactiPad in both cases.

For correct placement of the TactiPad the hinge has to face backwards (landscape position) or to the left (portrait position) to ensure that the measurement indications surrounding the TactiPad and the internal measurements system of the MDA will match.

Even in the portrait position, the frame of the TactiPad can be opened to replace the drawing paper, assuming the arm has fully moved backwards.

To ensure a maximum of tactile recognisable details in the image, the MDA will, when necessary, rotate and/or scale an image to fit on the TactiPads A4 sized drawing area. To do so, built in sensors detect the position of the TactiPad.

For a quick identification of the image, a right up marker is always sketched in the upper right corner of the image.

Almost to the rear of the MDA a black ridge protrudes from the MDA’s bed. This is the dock for the receiver of the TactileView’s digital pen.

Connectivity options

The back panel holds, besides the on/off push button and the power plug, the connectors for Ethernet an USB Type A en B . Not visible is the WiFi transmitter that operates the wireless connection for the hotspot or connecting to a local network.

For a detailed description of the connectivity options see the respective manual sections.

The backpanel of the MDA

Built-in interface on a smartphone

Built-in interface

The software in the MDA operates as a website. The page is accessible from any browser. The default address is http://mda/.

The home page presents a general description of the device, details for the network configuration and the owner/managers data.

The setup page offers password protection, WiFi/network configuration, selection of user interface language and the choice of the measurement system (metric / Imperial (USA)).

The Manual page directs to the English manual sections.

On the Examples and Interactive pages pre-made images can be found. Just select one of them and click to start sketching.

On the Upload page the images from external sources are listed. Files can be deleted from this folder for storage management.

The USB-drive page allows the reading and sketching from a USB drive.

The MyImages page allows users to submit a design request. Also see the section on the Community of designers.

TactileView software

With the rich toolset, including the graph module and the map maker module of TactileView it is really easy to create tactile diagrams.

The designs can be send via USB or over a local network connection to the MDA.

More information can be found in the TactileView manual.


Third party programs

For Windows and Mac based computers as well as for IOS and Android tablets and mobile phones numerous apps are available to convert existing images (JPG or PNG) to SVG or create new ones in this file format.

The files can be transferred to the MDA; send to the upload folder or to the auto-sketch folder for immediate sketching.

More information can be found in the respective manual sections.

Community of designers

When a user of the MDA can’t find a suitable image or is unable to create one himself, a design request can be submitted in a few steps on the MyImages page.

A design request is a personal request and always associated with an e-mail address. In a single user environment the request comes from the owner/manager of the MDA. In a multi user setting the user has to provide his personal e-mail address. This is to guarantee the created design is delivered to the right MDA/user.

When submitting a design request the content that should appear on the tactile diagram should be described as detailed as possible to make sure the designer knows what he has to create.

A MDA user can make arrangements with his own designers. When submitting the request he can select to whom the request is sent (Thinkable does not offer design capacity).

All design requests are stored on a dedicated website for further processing.

The selected designers receive an e-mail notification when a request is waiting for them as well as instructions on what to do if they want to honour the request. Only one of the selected designers can accept the request, create the image and upload his design work. After completion of the request the user who submitted the request will receive e-mail notification and the design will appear in the MyImages list ready for sketching.


Technical Specifications

The Raspberry Pi hardware contains the built-in interface software, takes care of the connectivity and converts the SVG information into G-codes to drive the motors.

The required file format is scalable vector graphics (SVG)

User interface languages: English, Dutch

Measurements system: Metric and Imperial (USA)



Power supply

Four motors


Included with drawing paper

Please note: The TactiPad drawing board is not included with the MDA