Enabling I2C on Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is I2C and why is it used on the Raspberry Pi?

I2C (Inter-Integrated Circuit) is a simple communication protocol that allows multiple devices to talk to each other using just two wires. On the Raspberry Pi, it is used to connect sensors, displays, and other modules easily.

beginner

How do you enable I2C on a Raspberry Pi using raspi-config?

Run the command sudo raspi-config, then navigate to Interface Options > I2C, and select Yes to enable it. Finally, reboot the Pi to apply changes.

intermediate

Which files must be checked or edited to enable I2C manually on Raspberry Pi?

You need to check or edit /boot/config.txt to add dtparam=i2c_arm=on and ensure the i2c-dev module is loaded in /etc/modules.

beginner

What command can you use to check if I2C devices are detected on Raspberry Pi?

Use sudo i2cdetect -y 1 to scan the I2C bus and see connected devices by their addresses.

beginner

Why is it important to reboot the Raspberry Pi after enabling I2C?

Rebooting restarts the system and applies the changes made to configuration files and modules, ensuring the I2C interface is properly activated.

Which two wires are used in the I2C protocol on Raspberry Pi?

A SDA and SCL

B TX and RX

C MOSI and MISO

D CLK and DATA

I2C uses SDA (data line) and SCL (clock line) for communication.

What command starts the Raspberry Pi configuration tool to enable I2C?

A sudo config-i2c

B sudo i2cdetect

C sudo enable-i2c

D sudo raspi-config

The sudo raspi-config command opens the configuration tool.

Which file should contain the line dtparam=i2c_arm=on to enable I2C?

A /etc/i2c.conf

B /boot/config.txt

C /etc/modules

D /boot/i2c.conf

The /boot/config.txt file is used to enable hardware features like I2C.

What does the command sudo i2cdetect -y 1 do?

A Enables I2C on bus 1

B Disables I2C on bus 1

C Scans the I2C bus 1 for connected devices

D Lists all I2C drivers

It scans the I2C bus number 1 and shows addresses of connected devices.

Why must you reboot the Raspberry Pi after enabling I2C?

A To apply configuration changes and load I2C modules

B To clear the I2C bus

C To update the operating system

D To reset the GPIO pins

Rebooting applies changes and loads necessary modules for I2C to work.

Explain the steps to enable I2C on a Raspberry Pi using the raspi-config tool.

Think about the menu options and final step to apply changes.

Describe how to verify that I2C devices are connected and detected on the Raspberry Pi.

Focus on the command and what its output shows.