Raspberry Pi - I2C Communication
Why is it important to use pull-up resistors on the SDA and SCL lines when connecting multiple I2C devices on the same bus?
Why is it important to use pull-up resistors on the SDA and SCL lines when connecting multiple I2C devices on the same bus?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand I2C line behavior
SDA and SCL lines are open-drain, meaning devices can only pull lines low, not drive them high.Step 2: Role of pull-up resistors
Pull-up resistors pull the lines to high voltage when no device is pulling them low, ensuring proper signal levels.Final Answer:
They ensure the lines return to high voltage when not driven low -> Option BQuick Check:
Pull-ups keep lines high when idle [OK]
Quick Trick: Pull-ups keep SDA and SCL lines high when idle [OK]
Common Mistakes:
MISTAKES- Thinking pull-ups prevent address conflicts
- Assuming pull-ups increase bus speed
- Believing pull-ups electrically isolate devices
Master "I2C Communication" in Raspberry Pi
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