Data Sheet

47 : circuit 2c
NEW CONCEPTS
FOR LOOPS: A for loop repeats a
section of code a set number of times. The
loop works by using a counter (usually
programmers use the letter “i” for this
variable) that increases each loop until it
reaches a stop value. Here’s an example of
a simple for loop:
for (int i = 0; i < 5; i++){
Serial.print(i);
}
The for loop takes three parameters in
the brackets, separated by semicolons. The
first parameter is the start value. In this
case, integer i starts at 0. The second value
is the stop condition. In this case, we stop
the loop when i is no longer less than 5 (i
< 5 is no longer true). The final parameter
is an increment value. i++ is shorthand
for increase i by 1 each time, but you could
also increase i by different amounts. This
loop would repeat five times. Each time
it would run the code in between the
brackets, which prints the value of i to the
Serial Monitor.
MEASURING DURATIONS OF TIME
WITH MILLIS(): The RedBoard has a
built-in clock that keeps accurate time.
You can use the millis() command to
see how many milliseconds have passed
since the RedBoard was last powered. By
storing the time when an event happens
and then subtracting the current time, you
can measure the number of milliseconds
(and thus seconds) that have passed. This
sketch uses this function to set a time limit
for repeating the pattern.
CUSTOM FUNCTIONS: This sketch
uses several user-defined functions. These
functions perform operations that are
needed many times in the program (for
example, reading which button is currently
pressed or turning all of the LEDs off).
Functions are essential to make more
complex programs readable and compact.
Circuit 2C: “Simon
Says” Game
The “Simon Says” game uses LEDs to flash a
pattern, which the player must remember
and repeat using four buttons. This simple
electronic game has been a classic since the
late 1970s. Now you can build your own!
YOU
NEED
10k
100k
330
 LEDS POTENTIOMETER PIEZO BUZZER  JUMPER WIRES  PUSH BUTTONS
  RESISTORS
SIK v4 Book Oct 13.indb 47 10/18/17 10:00 AM