Writing commands to I2C device in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the SMBus module needed for I2C communication.

Raspberry Pi

from smbus2 import [1]

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AI2C

BSMBus

CBus

DDevice

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'I2C' instead of 'SMBus' will cause an import error.

Using 'Bus' alone is not correct because the full class name is SMBus.

The SMBus class from smbus2 is used to communicate over I2C.

2fill in blank

medium

Complete the code to create an SMBus object for I2C bus number 1.

Raspberry Pi

bus = SMBus([1])

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A1

B0

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using bus 0 may cause errors if the bus is not enabled.

Using bus 2 or 3 is uncommon and may not exist on the device.

On Raspberry Pi, I2C bus 1 is commonly used for communication.

3fill in blank

hard

Fix the error in the code to write a single byte command 0x20 to the device at address 0x40.

Raspberry Pi

bus.write_byte([1], 0x20)

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A64

B0x20

C32

D0x40

Attempts:

3 left

💡 Hint

Common Mistakes

Using the command byte as the device address causes communication failure.

Using decimal 32 or 64 instead of hex 0x40 may cause confusion but 0x40 and 64 are equivalent; however, the code expects hex.

The first argument to write_byte is the I2C device address, which is 0x40 in this case.

4fill in blank

hard

Fill both blanks to write a block of data [0x01, 0x02, 0x03] to register 0x10 of device 0x50.

Raspberry Pi

bus.write_i2c_block_data([1], [2], [0x01, 0x02, 0x03])

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A0x50

B0x10

C0x20

D0x40

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping device and register addresses causes wrong data writes.

Using incorrect addresses will cause the device not to respond.

The first argument is the device address (0x50), the second is the register address (0x10).

5fill in blank

hard

Fill all three blanks to write the value 0xFF to register 0x01 of device 0x60 using write_byte_data.

Raspberry Pi

bus.write_byte_data([1], [2], [3])

Drag options to blanks, or click blank then click option'

A0x60

B0x01

C0xFF

D0x10

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up register and data values.

Using wrong device address causes no communication.

The first argument is the device address (0x60), the second is the register (0x01), and the third is the data byte (0xFF).