Raspberry Pi hardware overview (GPIO, USB, HDMI) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set up a GPIO pin as an output on a Raspberry Pi.

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup([1], GPIO.OUT)

Drag options to blanks, or click blank then click option'

AGPIO.IN

BGPIO.OUT

C17

DGPIO.BOARD

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.OUT instead of a pin number

Using GPIO.BOARD instead of a pin number

The number 17 refers to the GPIO pin number in BCM mode. This sets pin 17 as an output.

2fill in blank

medium

Complete the code to turn on an LED connected to GPIO pin 18.

Raspberry Pi

GPIO.output([1], GPIO.HIGH)

Drag options to blanks, or click blank then click option'

A18

B17

CGPIO.HIGH

DGPIO.LOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong pin number

Using GPIO.LOW which turns the LED off

Pin 18 is the GPIO pin connected to the LED. Setting it HIGH turns the LED on.

3fill in blank

hard

Fix the error in the code to read the state of a button connected to GPIO pin 23.

Raspberry Pi

button_state = GPIO.input([1])

Drag options to blanks, or click blank then click option'

AGPIO.OUT

BGPIO.HIGH

CGPIO.IN

D23

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.IN instead of a pin number

Using GPIO.OUT which is for output pins

GPIO.input requires the pin number to read its state. Pin 23 is correct here.

4fill in blank

hard

Fill both blanks to create a dictionary mapping USB port numbers to their status.

Raspberry Pi

usb_status = [1]((port, 'connected' if port [2] [1, 2] else 'disconnected') for port in range(1, 5))

Drag options to blanks, or click blank then click option'

Adict

Bin

Cnot in

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using list instead of dict

Using 'not in' which reverses the condition

We use dict() to create a dictionary. The 'in' keyword checks if the port is in the list [1, 2].

5fill in blank

hard

Fill all three blanks to create a dictionary of HDMI ports with their resolutions if active.

Raspberry Pi

hdmi_info = [1]: [2] if status [3] 'active' else 'inactive' for [1], status in [('HDMI1', 'active'), ('HDMI2', 'inactive')]}}

Drag options to blanks, or click blank then click option'

Aport

Bresolution

C==

D'1920x1080'

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '=='

Using a wrong key name

Using a wrong resolution string

We use 'port' as the key. If status is 'active' (checked with '=='), we assign resolution '1920x1080'.

Practice

1. Which Raspberry Pi hardware component allows you to connect and control electronic parts like LEDs and sensors?

easy

A. GPIO pins

B. USB ports

C. HDMI port

D. Ethernet port

Solution

1. Step 1: Understand GPIO function

   GPIO pins are designed to connect and control electronic parts such as LEDs and sensors.

2. Step 2: Compare with other ports

   USB ports connect devices like keyboards, and HDMI connects to screens, so they don't control electronics directly.

3. Final Answer:

   GPIO pins -> Option A

4. Quick Check:

   GPIO = electronic control pins [OK]

Hint: GPIO pins control electronics, USB and HDMI do not [OK]

Common Mistakes:

• Confusing USB ports with GPIO pins
• Thinking HDMI controls electronics
• Selecting Ethernet port which is for network

2. Which of the following is the correct way to describe the HDMI port on a Raspberry Pi?

easy

A. Connects to electronic sensors

B. Connects to USB devices

C. Connects to power supply

D. Connects to a display screen

Solution

1. Step 1: Identify HDMI port purpose

   The HDMI port is used to connect the Raspberry Pi to a display screen like a monitor or TV.

2. Step 2: Eliminate other options

   Electronic sensors connect via GPIO, USB devices connect to USB ports, and power supply uses a separate power connector.

3. Final Answer:

   Connects to a display screen -> Option D

4. Quick Check:

   HDMI = display connection [OK]

Hint: HDMI always connects to screens, not devices or power [OK]

Common Mistakes:

• Confusing HDMI with USB ports
• Thinking HDMI connects sensors
• Mixing power supply with HDMI

3. What will happen if you connect a keyboard to the Raspberry Pi's USB port?

medium

A. The keyboard will work and allow typing input

B. The keyboard will control GPIO pins directly

C. The keyboard will display output on the HDMI screen

D. The keyboard will charge the Raspberry Pi

Solution

1. Step 1: Understand USB port function

   USB ports connect input devices like keyboards and mice to the Raspberry Pi.

2. Step 2: Analyze keyboard behavior

   When connected, the keyboard sends typing input to the Raspberry Pi; it does not control GPIO or display output.

3. Final Answer:

   The keyboard will work and allow typing input -> Option A

4. Quick Check:

   USB port = input device connection [OK]

Hint: USB ports connect input devices like keyboards [OK]

Common Mistakes:

• Thinking keyboard controls GPIO pins
• Assuming keyboard shows output on HDMI
• Believing keyboard charges the Pi

4. You tried to connect a sensor to the Raspberry Pi but it did not work. You connected it to the USB port instead of the GPIO pins. What is the likely problem?

medium

A. The sensor needs HDMI connection to work

B. The sensor requires power from the USB port only

C. USB ports cannot directly connect sensors; use GPIO pins instead

D. The sensor must be connected to the Ethernet port

Solution

1. Step 1: Identify correct sensor connection

   Sensors connect to GPIO pins because they need direct electronic control signals.

2. Step 2: Understand USB port role

   USB ports connect devices like keyboards and storage, not sensors directly.

3. Final Answer:

   USB ports cannot directly connect sensors; use GPIO pins instead -> Option C

4. Quick Check:

   Sensors use GPIO, not USB [OK]

Hint: Sensors connect to GPIO pins, not USB ports [OK]

Common Mistakes:

• Trying to use HDMI for sensors
• Assuming USB powers sensors directly
• Confusing Ethernet port with sensor connection

5. You want to build a project that lights up an LED when you press a button connected to your Raspberry Pi. Which hardware ports will you use to connect the LED and button, and how will you see the output on a screen?

hard

A. Connect LED and button to Ethernet port; use USB for screen output

B. Connect LED and button to GPIO pins; use HDMI port for screen output

C. Connect LED and button to HDMI port; use USB for screen output

D. Connect LED and button to USB ports; use GPIO pins for screen output

Solution

1. Step 1: Identify connection for LED and button

   LEDs and buttons are electronic components controlled via GPIO pins on the Raspberry Pi.

2. Step 2: Identify how to display output

   The HDMI port connects the Raspberry Pi to a screen to show output visually.

3. Final Answer:

   Connect LED and button to GPIO pins; use HDMI port for screen output -> Option B

4. Quick Check:

   GPIO for electronics + HDMI for display [OK]

Hint: Use GPIO for electronics, HDMI for screen display [OK]

Common Mistakes:

• Connecting electronics to USB or HDMI ports
• Using USB for screen output
• Confusing Ethernet port with GPIO