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Raspberry Pi - Serial UART Communication

What will be the output of this Python code on Raspberry Pi communicating with Arduino over UART?

import serial
ser = serial.Serial('/dev/ttyS0', 9600, timeout=1)
ser.write(b'Hello Arduino')
response = ser.readline().decode().strip()
print(response)

APrints the response string sent by Arduino

BPrints 'Hello Arduino'

CPrints an empty line

DRaises a syntax error

Step-by-Step Solution

Solution:

Step 1: Analyze the code behavior
The code sends 'Hello Arduino' bytes to Arduino and waits to read a line response with timeout.
Step 2: Understand the output
It prints the decoded and stripped response from Arduino, not the sent message or empty line unless no response.
Final Answer:
Prints the response string sent by Arduino -> Option A
Quick Check:
ser.readline() reads Arduino reply [OK]

Quick Trick: ser.readline() reads Arduino reply, not sent data [OK]

Common Mistakes:

MISTAKES

Confusing sent data with received data
Expecting print to show sent bytes
Ignoring decode and strip steps

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What will be the output of this Python code on Raspberry Pi communicating with Arduino over UART?

Step 1: Analyze the code behavior

Step 2: Understand the output

Final Answer:

Quick Check:

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