lec 2

Question 1

what does a pull up/pull down resistor do

Answer 1

ensure the input voltage is maintained at +5 volts or ground

Question 2

WHEN/ what device would a pull up or down resistor be used

Answer 2

when using digital pin as input in Arduino

Question 3

WHY would you use a pull up or down resistor

Answer 3

voltage level appearing at that input will be unpredictable

Question 4

what instruction would you issue when using digital line

Answer 4

pinMode (pin_number , INPUT);

Question 5

what is the pull up pinmode() instruction

Answer 5

pinMode (pin_number , INPUT_PULLUP);

Question 6

what is the advantage of having 3 dedicated ports on Arduino, and what are these ports called

Answer 6

memory, speed and control

these ports are called: port B, port C and port D

Question 7

what Adrunio pins does Port B use?

Answer 7

digital pins D8 to pin D13

Question 8

what Adruino pins does Port C use?

Answer 8

uses analogue pins A0 to A5

Question 9

what Adruino pins does Port D use?

Answer 9

uses digital pins D0 to pin D7

Question 10

In any programming, or scripting language functions are an extremely powerful feature with
a significant number of benefits. what are they? (6)

Answer 10

 break down program into modules, creating a structured program.
 Reduce size of a program by eliminating duplication of code.
 Make debugging easier.
 Simplify the task of updating/modifying a program.
 Make a program easier to read.
 Permit the use of local variables

Question 11

what must all sketches have built in?

Answer 11

function if setup() and loop()

Question 12

what are the positioning of components in a sketch (5)

Answer 12

void setup() {
}

void loop() {
}

function 1() {
}

function 2() {
}

function n() {
}

Question 13

how are functions outside setup() and loop() presented in sketch (4)

Answer 13

appropriate function name 
preceded by the data type
function will return.
then set of parentheses.

Question 14

what is a parenthesis

Answer 14

used to pass one,

or more bits of information to the inner workings of the function in the form of variables.