Datasheet

Chapter 1 • Your Shield-Bot’s Brain
32 • Robotics with the BOE Shield-Bot
if(a == b)
{
Serial.print("a and b are equal");
}
 Try these variations in a sketch.
More conditions: You can chain more else if statements after the initial if.
• The example in this activity only uses one else if, but you could use more.
• The rest of the statement gets left behind after it finds a true condition.
• If the if statement turns out to be true, its code block gets executed and the rest of the chain
of
else ifs gets passed by.
Activity 6: Count and Control Repetitions
Many robotic tasks involve repeating an action over and over again. Next, we’ll look at two
options for repeating code: the
for loop and while loop. The for loop is commonly used for
repeating a block of code a certain number of times. The
while loop is used to keep
repeating a block of code as long as a condition is true.
A for Loop is for Counting
A for loop is typically used to make the statements in a code block repeat a certain number
of times. For example, your BOE Shield-Bot will use five different values to make a sensor
detect distance, so it needs to repeat a certain code block five times. For this task, we use
a
for loop. Here is an example that uses a for loop to count from 1 to 10 and display the
values in the Serial Monitor.
 Create and save the CountToTen sketch, and run it on your Arduino.
 Open the Serial Monitor and verify that it counted from one to ten.
// Robotics with the BOE Shield - CountToTen
void setup()
{
Serial.begin(9600);
for(int i = 1; i <= 10; i++)
{
Serial.println(i);
delay(500);
}
Serial.println("All done!");
}
void loop()