lesson 11

Question 1

what does the automated hand sanitizer consist of

Answer 1

a handset that will detect the hand and spray a liquid with the use of a pump,
relay,
buck converter,
IR sensor
a controller

Question 2

a mini pump has 2 components …what are they

Answer 2

DC motor and the casing for the liquid

Question 3

what is a DC motor

Answer 3

a device that converts electrical energy into mechanical rotational energy

Question 4

how does a DC motor work

Answer 4

by using electrical energy to generate electromagnetic fields (EMF)
Magnets inside the motor create an electromagnetic field to push against. This causes rotation about an axis

Question 5

look at lesson 11 page 2 to identify the parts of a mini pump

Answer 5

np

Question 6

the DC motor will be used to …

Answer 6

pump the sanitiser from the storage container to the dispenser

Question 7

what does a motor have

Answer 7

impeller attached to its axel

Question 8

what is contained in the case

Answer 8

motor and impeller

Question 9

how does the sanitizer move into the tubing system

Answer 9

the motor rotates the axle, the impeller turns and forces the sanitiser to move into the tubing system

Question 10

RPM stands for

Answer 10

revolutions per minute

Question 11

what is the speed of the motor rotation measured in

Answer 11

units called RPM (revolutions per minute).

Question 12

what powers a DC motor

Answer 12

a Battery

Question 13

what is RPM

Answer 13

the number of times a gear will complete a full rotation in one minute.

Question 14

what is important for controlling the rotation speed of the motor

Answer 14

voltage

Question 15

the monitor functions as a …

Answer 15

load, since the load represents anything that draws power.

Question 16

the arduino is the … and what is it used for

Answer 16

The Arduino is the brain of the entire system
is used to check and control the operation of the circuit

Question 17

how can arduinos be damaged
and what are they sensitive to

Answer 17

Arduinos are very sensitive to the flow of current
could be damaged if too high a load is connected directly to the Arduino

Question 18

The Arduino is considered to be a …system and what is the solution the the problem

Answer 18

low powered
The solution to this problem is to use a Relay

Question 19

what are relays used to do

Answer 19

adapt the current strength for the Arduino to handle

Question 20

What is a relay?

Answer 20

a type of switch that is used to control a circuit without the need for humanintervention.

Question 21

what do relays do

Answer 21

Relays control the circuit with the help of a signal to switch something on or off.
mainly used to control a high-powered circuit using a low-power signal.
Relays can allow the flow of high current levels while also protecting components, like the Arduino. They act as a gateway through which the Arduino can operate.

Question 22

look at page 4 to look at the parts of a relay

Answer 22

np

Question 23

a relay consists of

Answer 23

a high voltage system and a low voltage system

Question 24

…connect the high-voltage systems, like a motor or a battery, to the circuit

Answer 24

The screw terminals

Question 25

The … and … are connected to a relay to make it possible to operate pumps, refrigerators, and other high-powered loads.

Answer 25

high-voltage
high-current systems

Question 26

how does the switch work

Answer 26

when a low current is applied to the low-powered system, the switch closes and the NO port forms a closed circuit

Question 27

what does a motor do

Answer 27

obtains power from the battery

Question 28

what does VCC stand for

Answer 28

voltage common collector