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Touch-Screen Operated Emergency Vehicle Lighting &
Message Display System
With many emergency and utility vehicles now requiring Intelligent Lighting and Control Systems, NHT Design recently undertook a development to produce an modular Vehicle Lighting (including Light-Bars) and Moving Message Display system for use in environments where flexibility, modularity and reliability were critical requirements.
Key requirements for the design were also:-
- Rapid Assembly and Reduced Time to Market
- Modular Design and Extensibility
- Retrofit Capability for Standardised Light-Bar Housings
- In-Vehicle Touch-Screen Control with Multi-Lingual Support
- Fully Configurable via PC Interface for Operation & Maintenance Support
- Automotive Design Type Approval
- Compliance for Emergency Vehicle Standards with PITO Approval
The NHT Design Team met the challenge and produced a design that incorporated a TFT Display with touch-screen, a high brightness LED message display and a module to control the lighting units in a light-bar. In addition, a camera (or output from a multiplexed multi-camera system) can be easily displayed.
The system is easy to use and install. The touch-screen operation is intuitive, the camera can be displayed with one touch and the whole system can be controlled by one button-press in an emergency situation. On installation, most connections are made using pre-made cables with additional connections only required in high power situations.
Our Embedded High-Speed Digital Design Team produced a Design Solution in compact timescales with the following hardware features:-
- Fujitsu 64MHz 32-bit RISC CPU
- TFT Display 240 x 320 with Touch-Screen
- Fujitsu Lime Graphics Engine
- CAN 2.0 Module Communications
- Camera Support
- Microchip dsPIC33 Microcontroller
- Multi-Layer PCB Design
Our Embedded Software Specialists produced a fully configurable, scalable and robust touch-screen interface solution containing:-
- ANSI C coded interface with support for Lime frame-buffer device
- Fully configurable interface with bitmap support
- Support for image capture via camera interface
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