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Why I2C is used with Raspberry Pi - Challenge Your Understanding

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Challenge - 5 Problems
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I2C Master on Raspberry Pi
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🧠 Conceptual
intermediate
2:00remaining
Why is I2C commonly used with Raspberry Pi?

Which of the following best explains why I2C is commonly used with Raspberry Pi?

AI2C allows multiple devices to communicate using only two wires, saving GPIO pins.
BI2C requires a high number of wires, making it suitable for complex connections.
CI2C communication is wireless, so no physical connection is needed.
DI2C only supports one device at a time, simplifying communication.
Attempts:
2 left
💡 Hint

Think about how many wires I2C uses and how many devices it can connect.

❓ Predict Output
intermediate
2:00remaining
What is the output of this I2C device scan code on Raspberry Pi?

Consider this Python code snippet that scans for I2C devices connected to a Raspberry Pi:

import smbus
bus = smbus.SMBus(1)
for device in range(0x03, 0x78):
    try:
        bus.read_byte(device)
        print(f"Device found at address: 0x{device:02X}")
    except OSError:
        pass

If devices are connected at addresses 0x20 and 0x48, what will be printed?

Raspberry Pi
import smbus
bus = smbus.SMBus(1)
for device in range(0x03, 0x78):
    try:
        bus.read_byte(device)
        print(f"Device found at address: 0x{device:02X}")
    except OSError:
        pass
A
Device found at address: 0x20
Device found at address: 0x48
B
Device found at address: 0x03
Device found at address: 0x78
CNo output, code raises an exception
DDevice found at address: 0x20 only
Attempts:
2 left
💡 Hint

The code tries to read from each address and prints only if a device responds.

🔧 Debug
advanced
2:00remaining
Why does this I2C communication code fail on Raspberry Pi?

Look at this Python code snippet intended to write a byte to an I2C device:

import smbus
bus = smbus.SMBus(1)
address = 0x40
bus.write_byte(address, 0xFF)

When running, it raises an OSError: [Errno 121] Remote I/O error. What is the most likely cause?

AThe code uses write_byte instead of write_byte_data, causing syntax error.
BThe I2C device is not connected or powered on at address 0x40.
CThe Raspberry Pi does not support I2C communication on bus 1.
DThe address 0x40 is reserved and cannot be used for devices.
Attempts:
2 left
💡 Hint

Think about hardware connections and device presence on the bus.

📝 Syntax
advanced
2:00remaining
Which code snippet correctly initializes I2C on Raspberry Pi using Python?

Choose the correct Python code to initialize the I2C bus 1 on Raspberry Pi.

A
import smbus
bus = smbus.SMBus('1')
B
import smbus
bus = smbus.SMBus(0)
C
import smbus
bus = smbus.SMBus(1)
D
import smbus
bus = smbus.SMBus()
Attempts:
2 left
💡 Hint

Bus 1 is the standard I2C bus on Raspberry Pi models after revision 2.

🚀 Application
expert
2:00remaining
How many devices can be connected on a single I2C bus on Raspberry Pi?

Given the 7-bit addressing scheme of I2C, what is the maximum number of unique devices that can be connected to a single I2C bus on a Raspberry Pi?

A128 devices
B255 devices
C64 devices
D127 devices
Attempts:
2 left
💡 Hint

7-bit addressing means 2^7 minus reserved addresses.