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lesson 4 "" Flashcards

RGB leds and arduinos

1
Q

what is an arduino made up of

A

ATmega
USB (universal serial bus) port
12 V charging point
several input- and output pins

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2
Q

The ATmega chip is where …
The pins are used to …

A

code is stored and calculations are made
control devices such as lights, alarms and motors.

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3
Q

go to page 2 and 3 to study the parts of an arduino

A
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4
Q

Vin
GND
5 V
3.3 V
RESET
IOREF

A

> used to get voltage power from our external power supply.
ground pins to connect to negative rails
supplies 5 Volts to a separate device or circuit
supplies 3.3 Volts to a separate device or circuit.
can reset the Arduino when it is polled.
provides a reference for external communication.

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5
Q

An RGB LED is the …

A

combination of three LEDs (red (R), green (G) and blue (B)) in one little package

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6
Q

the intensity of each LED can be changed in one of two ways…

A

Resistor connected to each LED can be changed (higher resistances will lower the intensity on theLED)
the voltage applied to each LED can be changed (higher voltage will increase the intensity of the LED)

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7
Q

OHM’s Law…

A

V=IR

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8
Q

There are two main types of RGB LEDs: and explain

A

anode RGB LED
cathode RGB LED
main differences are the way they are connected and the type of signal sent to the RGB LED to three LEDs.

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9
Q

An RGB LED works by …

A

connecting the LED colours so that they can combine to generate a secondary colour.

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10
Q

RGB LEDs are used in plenty of different environments, such as:

A

LED strips
colour changing light bulbs
On gaming computers, mouse and keyboards
LED screen that you use, on your phone, computer or TV

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11
Q

why are colours important in coding

A

to confirm that circuits are built correctly and components are functioning properly

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12
Q

longer word for arduino

A

Arduino Development Board.

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13
Q

…should come on to show that the arduino is on
The … should also blink

A

green light
orange light

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14
Q

cathode =
anode =

A

negative
positive

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15
Q

The voltage and current in a circuit are …to one another hence … can be used to control the colour of the LED

A

linearly proportional
both

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16
Q

The common Ohm’s law equation shows the …

A

direct proportionality of voltage and current and how they both affect the resistance

17
Q

If the current in the circuit stays constant, and the voltage is increased, the resistance of the LED will need to… for the equation to be valid;

A

decrease

18
Q

if the Resistor connected to the LED is increased; the voltage used by the LED will need to …, thus affecting the light intensity emitted.

A

increase

19
Q

red and blue are both connected, the resulting light emitted will be a combination of these two colours –>

A

magenta

20
Q

RGB additive colours

A

red, green and blue

21
Q

emitted (a process …

A

which uses the additive colours to create secondary colours

22
Q

painted (a process …

A

which uses the primary colours to create secondary colours

23
Q

RGB lights will cause the emitted light to appear as a secondary colour, i.e….

A

.yellow, magenta, cyan or white

24
Q

Each colour has associated RGB values. These values tell us …

A

what voltage each LED must be set to, in order to emit that specific colour

25
Q

Connect the Arduino 5 V pin to the breadboard … rail with a … wire

A

positive
red

25
Q

go to page 9 to see what colours make the secondary colours

A
26
Q

Connect the Arduino GND pin to the breadboard … rail with a …wire

A

negative
black

27
Q

To decrease the voltage to each LED (red,green and blue), connect each LED pin to a…

A

220 Ω resistor

28
Q

When the red, green and blue LEDs shine simultaneously, a … light is emitted

A

white

29
Q

Disconnect the green wire from the positive rail of the breadboard, leaving only and blue LEDs connected. A … coloured light is emitted

A

magenta

30
Q

By changing the wiring connections so that the red and green LEDs are connected, a…light is emitted,

A

yellow

31
Q

The Resistors …

A

decrease the incoming voltage to avoid overloading the LEDs

32
Q

IC (…)

A

integrated circuit

technology (8 decks)

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