Version 4 Improvements

Following heuristics it was noticed that when the system was switched off (previous testing involved the batteries being pulled out), current was allowed to flow through the MP3player and it turned on. This was a massive problem.

To fix it the MP3 player needed its own switch and the manual had to be changed. A white switch was soldered onto the yellow wire (anode).

This has to be turned on and off in a very specific way;

ON: turn on black switch THEN white switch
OFF: Turn on white switch THEN black switch

Not doing this could cause the system to behave unpredictively.

The system has also been reset to turn on/off for only 10 seconds for the submission.

Wires were insulated using plastic.