Guess what? Turns out the breadboard was fried! We rewired the whole circuit on a completely different board and voila! The LED turns on! But that's about it. The LED is supposed to turn off when a key is pressed and it is not doing so. Since we are realizing that this voice recognition circuit is going to give us trouble, we have already reached out to other blogs and other groups that have used it in the past and that could maybe offer some assistance.
Some of those links are listed here:
1. http://letsmakerobots.com/node/26178
2. http://www.projectbloc.com/seniorproject/
3. http://www.the4cs.com/~corin/cse477/toaster/FinalReport.html
Unfortunately, some of these blogs are about ten years old and although we have contacted them, the information about the circuit is limited. Additionally, a lot of the projects that use the HM2007, actually used the preassembled PCB board, and therefore aren't very helpful. On the most part, the advice people suggest is to just double and triple check the wiring and that eventually it should work, unless the chips are faulty (which is a real possibility).
After the half-way demo, our professor suggested we go ahead and buy the PCB as a back-up plan and meanwhile continue trying to make our wired circuit work.
Since we want to have a complete project by the time of the actual demo, Jefta has started working on another Plan B. This consists of building our own remote control that we would integrate with the XBees and mBed that we already have working. Hopefully we won't have to come to that but better safe than sorry!
Now to the umpteenth rewiring attempt....
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