Download Appendix D -‐ Flash Memory Code

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mA of current per GPIO line, transistors were added to the design to allow approximately
13.3 mA of current through each LED.
Figure 7 - Initial light block design
During spring term, the group decided that it would be better if each light could be
controlled separately. The microcontroller had four extra GPIOs, so there wasn’t a
problem on that end. An unexpected difficulty came from the constrained size of the
case. The protoboard containing the light components had to fit in a small area on top of
the guitar and was already cramped. Building a new light board would have required
additional labor and time, which we were already strained for. The old light board was
simply rewired so each LED connected to the microcontroller, rather than being
connected through the base of the transistor. The downside to this approach was that the