Here are more examples of Electrical Engineering projects developed at Livingston Products.
The Model 531 Film-ID device stores exposure settings and patient identification information on X-Ray film.
The device can store more than 24,000 patients in its internal database. It communicates with host computers via USB or serial interfaces. It supports a PS/2 keyboard and a graphics LCD for the human interface.
This device is implimented using a single multi-layer control board which was designed completely by LPI. All firmware was developed in-house. This board is designed to be field-replaceable to allow repair without returning the device to the factory.
The device is controlled by an ARM™ microcontroller and contains large external bus Flash and SDRAM memory devices.
The PS/2 keyboard interface is implemented using custom PLD logic.
PLD logic is also used to provide interface paths and control signal multiplexing to two LCDs. Each LCD has an independent firmware controled contrast level, implemented with digital potentiometers.
On board USB device and serial interfaces provide connection to host computers and to X-Ray equipment. The USB interface also provides a mechanism for in-field firmware updates.
On board power regulation provides the required logic voltages from an input DC voltage. Power is output to X-Ray interface cables to drive thier logic.
A JTAG debugger interface connection is provided to support initial firmware loading, firmware development, and factory problem diagnosis.
LPI also designed and implemented optically isolated X-Ray equipment interface cables which allow the 531 device to connect to more than 25 different X-Ray machines.
Image Acquisition Goggles
Custom electronics was developed at LPI to allow eye movement images to be captured by two CCD cameras and transferred to a PC based diagnostic system. Note the circuit board's shape prevents the camera view from being blocked.
An analog filter module was designed to improve the quality of video signals provided to the PC.
This application is described in more detail in the Mechanical section of this web site. You may click on the image to the left to visit a more detailed description of this project.