4Discovery 3.5″ Integrated Wall/Panel Mount Display

The 4Discovery is designed to be mounted to a standard light switch flush/mounting box, which enables quick and easy installation in to a wall, and can just as easily be mounted into an enclosure or panel or directly onto the wall, enabling a wide range of customers to take advantage of this display product.

Driving the display and peripherals is the DIABLO16 processor, a very capable and powerful chip which enables stand-alone functionality, programmed using the 4D Systems Workshop 4 IDE Software. The Workshop IDE enables graphic solutions to be constructed rapidly and with ease due to its design being solely for 4D graphics processors.

The 4Discovery has an array of features including a 3.5″ 320×480 TFT LCD Display, Resistive Touch, micro-SD memory storage, 16MB of Flash Memory storage, Real Time Clock, 2 wire RS485 Interface which can act as Master or Slave with additional changeover wire, Optional WiFi, Optional Crypto Authentication security chip for secure transmissions, and a switch-mode power supply enabling a wide input voltage range, along with many more features.

This 4Discovery can be programmed to store 16MB worth of graphics, images, videos, data on the external flash, which may be desirable so a microSD card is not required. Additional images/data can be stored on the microSD card, or the microSD card can be used to upgrade the application running on the 4Discovery or update the external Flash memory. The options

Information about the Display Module

  • Powerful 3.5″ Intelligent LCD-TFT display module powered by DIABLO16.
  • 480×320 HVGA Resolution, RGB 65K true to life colours, TFT Screen with integrated 4-wire Resistive Touch Panel.
  • Programmed over RS485 using a special programmer designed specifically for the 4Discovery.
  • 6 banks of 32750 bytes of Flash memory for User Application Code and Data
  • 32Kb of SRAM purely for the User.
  • On-board micro-SD memory card connector for multimedia storage and data logging purposes. HC memory card support is also available for cards larger than 4GB.
  • On-board external 16MB of serial Flash for multimedia storage, datalogging etc. Can be used as an alternative to microSD, or as well as.
  • DOS compatible file access (FAT16 format) as well as low level access to microSD card memory.
  • Display full colour images, animations, icons and video clips on chosen 4D Systems display.
  • Supports all available Windows fonts.
  • 5.0V or 6.3V to 36V input voltage range operation (single supply).
  • Module dimensions: 74 x 117.0 x 21.7mm
  • Weight approximately 75g.
  • Display Viewing Area: 48.96 x 73.44mm
  • Easily mounted to the wall using a standard light switch flush/mounting box, or can be mounted in an enclosure/panel or virtually any flat drillable surface.
  • Compatible with Clipsal/HPM mounting blocks, 18mm or thicker, if the 4Discovery needs to be offset from the wall (useful for concrete block walls etc.).
  • RoHS and CE Compliant.

The 4Discovery-35 includes the following items:

  • 4Discovery-35 Display Module
  • Getting Started Manual available as a Download

If you are a first time user and just beginning your development, we strongly recommend purchasing a Starter Kit of this same model as it includes additional items that allow you to get started with your development immediately.

Starter Kit part number is SK-4Discovery-35.


Diagonal Display Size INCHES





~216 cd/m2

Backlight LEDs






Operating Ambient Temperature

-20°C to +70°C

Storage Temperature

-30°C to +80°C



Display Viewing Area (mm)

73.4 x 49.0

Module Dimensions (mm)

74.00 x 117.00 x 22.00



Country of origin


CCCN / tarif code


ECCN export control code






Package Dimensions L x W x H (mm)

125 x 105 x 41

Product Weight (g)


Weight with Packaging (g)




CE Mark


Supply Voltage

5V or 6.3V – 36V DC

Supply Current


Frame Rate

7.9 fps



SD Card Slot

Yes – RAW or FAT16 Support. SPI Compatible microSD Cards Only


6 banks of 32KB




Used for SD Card Slot

Codeless Programming



4D Workshop4 IDE

Serial Speed

300 to 250000 baud

Serial Interfaces

1 x RS485 Channel

Viewing Angle

Standard Viewing Angle


Viewing Area: 73.4 x 49.9 mm

Module Width: 74.0 mm

Module Height: 117.0 mm

Module Depth:22.0 mm

Module Weight: 75 g


Workshop4 is a comprehensive software IDE for Microsoft Windows that provides an integrated software development platform for all of the 4D family of processors and modules. The IDE combines the Editor, Compiler, Linker and Downloader to develop complete 4DGL application code.

All user application code is developed within the Workshop4 IDE.


Workshop4 includes four development environments for the user to choose based on application requirements or even user skill level.


Make complex widget design, simple.

Smart Widgets Editor is a powerful utility which enables the generation of Smart Widgets.

  • Users can create complex widgets with up to six layers, including the layer for the base image. The order of the layers can be arranged as desired.
  • Each layer can contain one or more images arranged in sequence that can be manipulated in a variety of ways. Image manipulation options include horizontal motion, vertical motion, and angular motion. Additionally, the transparency of a layer can be set.
  • Two or more layers can be linked to produce synchronized movements of images. This enables the generation of complex widgets with multiple moving parts. Clockwork feature is also supported. This enables users to quickly generate clock widgets.
  • Each layer can have a numeric part which can display numbers in various fonts and formats. Alternatively, the numeric part can be a fixed sequence of text.
  • The output frames can be utilized using any of the supported Workshop4 environments.


Genie Magic is an extension to ViSi-Genie, which is available in Workshop4 PRO. Genie Magic allows the User to add 4DGL code to various points in the ViSi-Genie backend code, which allows Users to take full advantage of the power of 4DGL, while retaining the speed and convenience of ViSi-Genie and its defined communication protocol.

Genie Magic allows you to enter 4DGL code in the form of Events, Code and Objects, along with various touch related additions too, giving you to the power to achieve advanced GUI’s in ViSi-Genie without having to write the full code yourself.

Genie Magic is fully supported by the genieArduino and geniePi libraries, making communication with an Arduino or Raspberry Pi host even more powerful.

When using Genie Magic in combination with the Smart Widget Editor, it is possible to use the Smart Widgets Editor tool and Smart Widgets to create other graphical user interface elements such as:

  • Dropdown Menu

  • Side Menu

  • ‘Carousel Slider’

  • List Box

  • Dock Menu
  • Quarter-Rotary Menu

  • Fading Slide-To-Unlock Button

  • Spectrum With Transparency

  • And Many Others


Compatibility: Workshop4 is a Windows-only product. It is compatible with Windows 8 through to Windows 11.

Note some older OS such as ME, Vista, XP and 7 have not been tested for some time and are not supported by Microsoft anymore; however, they may still work.
Legacy support updates for the older OS may not be possible, depending on what issues are found. For best results, run a current Windows OS. It is possible to run Workshop4 under a VM on Linux or Mac. However, it is up to the User to set this up.


We are delighted to offer volume discounts to qualified customers and organizations.

Our dedicated Volume Sales team will address your specific requirements and help you get an accurate quotation in a timely manner.

Order Now


  • 3.5″, 320×480 pixels, Intelligent Display with Resistive Touch
  • High-resolution with Integrated Wall/Panel mountable display solution and embedded DIABLO16 processor.
  • Starter Kits available for first time users.
  • See product description below for more details.


We are delighted to offer volume discounts to qualified customers and organisations.

Starter Kits and Accessories

  • SK-4Discovery-35 Starter Kit for first-time users

    This Starter Kit includes everything you need to integrate the 4Discovery-35 into any project, and it is  ideal for first-time users. The SK-4Discovery-35 Starter Kit includes:
    • 4Discovery-35 Display Module
    • 4Discovery RS485 Programmer
    • 4GB Industrial microSD Card
    • Getting Started Manual available as a Download


  • 4Discovery RS485 Programmer

    • The 4Discovery RS485 Programmer is an essential hardware tool to program, customise and test the 4Discovery module.


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