[Solved] You wrote this code to read from an I2C sensor on Raspberry Pi: import smbus bus = smbus.SMBus(1) address = 0x40 value = bus.read_byte(0x40) print(value) But it raises an IOError.... | Raspberry Pi

Raspberry Pi - I2C Communication

You wrote this code to read from an I2C sensor on Raspberry Pi:

import smbus
bus = smbus.SMBus(1)
address = 0x40
value = bus.read_byte(0x40)
print(value)

But it raises an IOError. What is the likely problem?

AThe code should use <code>write_byte</code> instead of <code>read_byte</code>.

BThe sensor is not connected or powered properly at address 0x40.

CSMBus(1) is incorrect; it should be SMBus(0).

DThe address 0x40 is invalid for I2C devices.

Step-by-Step Solution

Solution:

Step 1: Understand IOError cause
IOError usually means no device responds at the given address.
Step 2: Check device connection
If sensor is not connected or powered, Raspberry Pi can't read data, causing error.
Final Answer:
The sensor is not connected or powered properly at address 0x40. -> Option B
Quick Check:
IOError = device missing or unpowered [OK]

Quick Trick: IOError means device not found or powered [OK]

Common Mistakes:

MISTAKES

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