Practice Assessment

1. Which of the following codes is used to turn off the configured LED colors of Leanbot?

• 1. LbRGB.off( );

• 1. LbRGB.show( );

• 1. LbRGB.on( );

• 1. LbRGB.clear( );

Answer explanation

1. LbRGB.clear( ); is used to turn off/clear LED lights shown.

1. Which of the following is the best way to set complicated colors like army green?

• binary code

• hexadecimal value

• color name

• RGB colors

Answer explanation

A color's hexadecimal value can be searched in the internet. It is used to name complex colors like pastel colors.

How many RGB LEDs does a Leanbot have?

• 8

• 6

• 3

• 7

Answer explanation

Leanbot has 7 RGB LEDs that are labeled as 0,1,2,3,4,5,6 or O,A,B,C,D,E,F.

You want to set 1 RGB LED into red color. Which of the following codes executes your desired outcome?

• LbRGB[ledO] = CRGB::Red

• LbRGB.fillColor(CRGB::Red);

• LbRGB.fillColor(CRGB::Red, BITMAP(ledO,ledA));

• LbRGB[1,2,3] = CRGB::Red;

Answer explanation

LbRGB.fillColor is used if you want to set ALL lights into a particular color.

Which function allows you to set multiple LED lights into one particular color?

• LbDelay

• Leanbot.tone

• BITMAP

• fillColor

Answer explanation

BITMAP is used to set multiple LED lights (not all) into one specified color.

What type of code is Leanbot.tone?

• executing code

• blocking code

• loop

• non-blocking code

Answer explanation

Leanbot.tone is a non-blocking code. It doesn't pause the program but instead, it keeps doing other things at the same time. That's why it need LbDelay.

Compile error occurs when there is something wrong with your code.

• True

• False

Answer explanation

Compile error occurs when there is a mistake in the code that causes the code not to run. Like a misspelled word, wrong capitalization, or a missing semi colon.

Which of the following platform do we use to save and share our codes?

• Blockly

• PLearn

• PGit

• PIDE

Answer explanation

PGit serves a code bank where we can store our codes so we can share or reuse it.