When I was younger we had an electronic toy which had
four flashing lights and a speaker that output tones. The toy would
output a random sequence of notes that you had to copy by pushing the
lights (they were also buttons). This little project implements a similar
copycat game on the LPC1114.
The video below shows the operation of the program. It begins with
a little tune that I hope you recognize. The program then waits for you
to hit any of the 4 LED buttons. It indicates that user input is required
by flashing all lights quickly. Each round consists of the micro producing
a sequence of tones and flashes. The user must copy the sequence after being
prompted (two brief bursts of all lights). If the user make a mistake, the
white and red LED's flash quickly. If the user completes all 8 rounds
successfully then the 4 leds light up in rapid succession.
An element of randomness had to be added to the game. This is achieved using
a Pseudo Random Binary Sequence (prbs) function. The function is called by
the main program thread and also by a periodic timer interrupt (1kHz). The
cycling of the prbs function by the interrupt service routine adds an element
of uniqueness to each game as the player's response times will never be exactly
the same.
Thanks to Sam and Oran for testing and demonstrating.
