smbus2 library for I2C in Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the smbus2 library in Raspberry Pi programming?

The smbus2 library allows easy communication with I2C devices by providing simple methods to read and write data over the I2C bus.

beginner

How do you open an I2C bus using smbus2?

You create an SMBus object with the bus number, for example: bus = SMBus(1) opens I2C bus 1 on Raspberry Pi.

beginner

Which smbus2 method would you use to write a single byte to a device?

Use write_byte(addr, value) where addr is the device address and value is the byte to send.

beginner

How can you read a byte from a specific register of an I2C device using smbus2?

Use read_byte_data(addr, register) where addr is the device address and register is the register number to read from.

intermediate

Why is it important to close the SMBus object after communication?

Closing the SMBus object releases the I2C bus resource properly, preventing conflicts or errors when other programs try to use the bus.

Which Python statement correctly opens I2C bus 1 using smbus2?

A bus = SMBus(1)

B bus = SMBus.open(1)

C bus = smbus2(1)

D bus = open_smbus(1)

The correct way is to create an SMBus object with the bus number: bus = SMBus(1).

What does the method write_byte(addr, value) do?

A Closes the I2C bus

B Reads a byte from the device at address <code>addr</code>

C Writes a byte to the device at address <code>addr</code>

D Opens the I2C bus

It sends a single byte value to the device at the given I2C address addr.

Which method reads a byte from a specific register of an I2C device?

A read_byte_data(addr, register)

B write_byte_data(addr, register, value)

C read_byte(addr)

D read_word_data(addr)

read_byte_data(addr, register) reads a byte from the specified register.

Why should you close the SMBus object after use?

A To save memory

B It is not necessary

C To speed up the program

D To release the I2C bus resource

Closing releases the I2C bus so other programs can use it without conflicts.

What is the default I2C bus number on most Raspberry Pi models?

A 0

B 1

C 2

D 3

Most Raspberry Pi models use I2C bus 1 by default.

Explain how to use the smbus2 library to write a byte to an I2C device on Raspberry Pi.

Think about opening the bus, sending data, and closing it.

Describe the steps to read a byte from a specific register of an I2C device using smbus2.

Focus on opening the bus, reading from a register, and closing the bus.