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In order to finalize our prototype and our project, we decided to solder the components of the Music box on a printed circuit.

Here is the scheme of the circuit:

Fritzing scheme of the Music box

Fritzing scheme of the Music box

The EPFL has a small laboratory where you can design your own circuit. To have access to this laboratory, we had to follow an introductory course which was given by Manuel Leitos.

We then designed our printed circuit board using the EAGLE (Easily Applicable Graphical Layout Editor) software, which has a freeware version available. To learn how to use this software, we found a tutorial on Sparkfun. We added two different libraries on EAGLE in order to find our specific components. Both libraries are on github, the first one is Adafruit, and the second one is Sparkfun.

Components of the circuit: 1 arduino uno, 2 potentiometers, 2 push buttons, 1 RGB LED, 1 piezo speaker, 5 resistors.

The design of the a printed circuit on EAGLE happens in two steps :
First we created a schematic with all our components routed:

Schematic_MusicBoxFigure of the Schematic of the Music Box

Then we designed a board from the schematic:

Board_MusicBoxFigure of the board of the Music Box

Once the design of the circuit was done, we printed both sides on two plastic films and we superimposed them in order to have each on one side of the copper plate:

printing of the eagle board on plastic film

printing of the eagle board on plastic film

Then, we went to the laboratory and followed a specific procedure to create the printed circuit including several washing steps of the copper plate, photoresist covering of the plate, printing of our circuit onto the plate with UV light, acid engraving …

Realization of the printed circuit board

Realization of the printed circuit board

IMG_6136

We printed it twice in case something went wrong. After that, we checked with the microscope that the printing was correct, we drilled the holes and we cut the circuit to have the following final result:

drilling the holes and cutting the plate

drilling the holes and cutting the plate

Finally, the last step was to solder the components on the PCB but we didn’t have the time to finish that yet.

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