[Solved] You wrote this Python code to read a message from serial:data = ser.read_until(b'\x03')But it never returns. What is the likely problem? | Raspberry Pi

Raspberry Pi - Serial UART Communication

You wrote this Python code to read a message from serial:

data = ser.read_until(b'\x03')

But it never returns. What is the likely problem?

AThe end byte 0x03 was never sent by the device

BThe baud rate is set too high

CThe start byte is missing in the code

DThe serial port is not opened

Step-by-Step Solution

Solution:

Step 1: Understand read_until behavior
read_until waits until it reads the specified byte (0x03) to stop reading.
Step 2: Identify why it blocks
If the device never sends 0x03, the function waits forever.
Final Answer:
The end byte 0x03 was never sent by the device -> Option A
Quick Check:
read_until blocks if end byte missing [OK]

Quick Trick: Ensure end byte is sent or read_until will block [OK]

Common Mistakes:

MISTAKES

Master "Serial UART Communication" in Raspberry Pi

9 interactive learning modes - each teaches the same concept differently

More Raspberry Pi Quizzes

You wrote this Python code to read a message from serial: