Serial protocol design in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a serial port on Raspberry Pi.

Raspberry Pi

import serial
ser = serial.Serial([1], 9600)

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

A"/dev/ttyS0"

B"/dev/ttyUSB0"

C"COM1"

D"/dev/serial0"

Attempts:

3 left

💡 Hint

Common Mistakes

Using Windows COM port names like COM1.

Using USB serial device names when not connected via USB.

On Raspberry Pi, the primary serial port is usually accessed via /dev/serial0.

2fill in blank

medium

Complete the code to send the string 'Hello' over the serial port.

Raspberry Pi

ser.write([1])

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

Ab'Hello'

B"Hello"

C'Hello'

DHello

Attempts:

3 left

💡 Hint

Common Mistakes

Sending a string without converting to bytes causes errors.

Forgetting the byte prefix b.

The write method requires bytes, so prefix the string with b.

3fill in blank

hard

Fix the error in reading one byte from the serial port.

Raspberry Pi

data = ser.read([1])

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

A-1

B1

C10

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 0 or negative numbers causes no data or errors.

Passing a larger number reads more bytes than needed.

To read one byte, pass 1 as the argument to read.

4fill in blank

hard

Fill both blanks to create a dictionary mapping bytes to their ASCII codes for letters only.

Raspberry Pi

ascii_map = {chr([1]): [2] for [1] in range(65, 91)}

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

Ai

Bord(i)

Cchr(i)

Di+32

Attempts:

3 left

💡 Hint

Common Mistakes

Using ord(i) causes a TypeError because i is an integer, not a string or character.

Using the wrong variable name in the comprehension.

Use i as the loop variable and i as the value since range(65, 91) generates the ASCII codes for uppercase letters directly.

5fill in blank

hard

Fill all three blanks to filter and map serial data bytes greater than 100.

Raspberry Pi

filtered = [[1] for [2] in data if [2] [3] 100]

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

Abyte

Bb

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for output and loop variable causes confusion.

Using < instead of > changes the filter condition.

Use byte as the output, b as the loop variable, and > to filter bytes greater than 100.