Team:ESBS-Strasbourg/Results/Device

1. Introduction
2. Printed circuit board
3. Microcontroller software
4. Computer software

To make the characterization of our biological system we developped a lighting device which can be controlled from a computer. The goal of this device is to create red and infrared pulses which period and duration are fixed by the user in a computer interface.

The lighting part of the device is composed of two parts:
• A LEDs band which is composed of four red LEDs put alternately with four infrared LEDs and used to enlighten a tube
• A box subdivided into a 3-by-3 matrix of compartments, each one containing a red and an infrared LED and used to enlighten independently nine biological materials

These two parts are represented on the following scheme:

We designed the printed circuit board with Kicad, a free PCB design tool. You can download Kicad at this address:
http://www.lis.inpg.fr/realise_au_lis/kicad/

Here you can download the PCB file of the circuit:

The following picture explains the different components used:



And here is the list of the corresponding components used:

The microcontroller used is a Microchip pic 18F452 which is easily programmable in C language with MPLAB combined to a C18 compiler. The link between the computer and the microcontroller is carried through the serial port.

Here you can download the hex file of the program:

And here are the source files of the software:

We developped the computer software with Microsoft Visual C++. You can download Express version at this address:
http://msdn.microsoft.com/fr-fr/express/default.aspx

The following picture illustrates the software interface:



Here you can download the software:

And here are the source files: