Communicating with Arduino over UART in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Raspberry Pi

import serial

ser = serial.Serial('/dev/ttyS0', [1])
print("Serial port opened")

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

A9600

B115200

C19200

D4800

Attempts:

3 left

💡 Hint

Common Mistakes

Using a baud rate that does not match the Arduino's baud rate.

Forgetting to specify the baud rate when opening the serial port.

The baud rate 9600 is the standard speed for UART communication with Arduino.

2fill in blank

medium

Complete the code to send the string 'Hello Arduino' over UART.

Raspberry Pi

message = 'Hello Arduino'
ser.write([1])
print("Message sent")

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Amessage

Bstr(message)

Cmessage.encode()

Dbytes(message, 'utf-8')

Attempts:

3 left

💡 Hint

Common Mistakes

Sending a string directly without encoding causes an error.

Using bytes() without encoding may cause unexpected results.

We must encode the string to bytes before sending over UART.

3fill in blank

hard

Fix the error in reading a line from UART and decoding it.

Raspberry Pi

line = ser.readline()
text = line.[1]('utf-8').strip()
print(text)

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Ato_string

Bdecode

Cdecode_utf8

Dencode

Attempts:

3 left

💡 Hint

Common Mistakes

Using encode() instead of decode() on bytes.

Using a non-existent method like decode_utf8 or to_string.

We use decode('utf-8') to convert bytes to string.

4fill in blank

hard

Fill both blanks to create a dictionary of word lengths for words longer than 3 characters.

Raspberry Pi

words = ['arduino', 'pi', 'uart', 'code']
lengths = {word: [1] for word in words if len(word) [2] 3}
print(lengths)

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Alen(word)

B>

C>=

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using word instead of len(word) for dictionary values.

Using '>=' instead of '>' which includes words of length 3.

We use len(word) to get length and filter words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values greater than 2.

Raspberry Pi

data = {'temp': 1, 'humidity': 3, 'pressure': 5}
filtered = [1]: [2] for k, v in data.items() if v [3] 2}
print(filtered)

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Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using k instead of k.upper() for keys.

Using '<' or '>=' instead of '>' for filtering.

Keys are converted to uppercase with k.upper(), values are v, and filter uses '>' to select values greater than 2.