A full single-board computer that runs a general-purpose operating system

A device that can only run one program at a time with no operating system

A programmable calculator with limited memory

Headless or resource-constrained projects that don't need a graphical interface

Gaming setups that require extra graphics drivers

Numbering pins by their physical position on the header, regardless of chip function

Numbering pins by the internal Broadcom chip channel number

Numbering pins alphabetically by their label color

The pin's voltage is driven to a logic-high level, roughly 3.3V

The pin is disconnected from the circuit entirely

It holds the pin at a known LOW level when the switch is open

It boosts the voltage supplied to the switch itself

It converts the digital signal into an analog one

It can suffer from timing jitter since it depends on CPU scheduling

It cannot be used to control LED brightness at all

It requires a completely separate power supply

It lets the motor's direction be reversed and its speed controlled safely

It converts the motor's mechanical output into an electrical signal

It permanently locks the motor to spin in only one direction

The physical mounting angle of the screen

So the circuit and code remain understandable later or to others reusing the project

Because the Raspberry Pi requires documentation to boot correctly

Because GPIO pins physically relabel themselves between reboots

SPI is typically full-duplex, sending and receiving data at the same time, while I2C is not

I2C requires a dedicated clock line but SPI never does

SPI addresses devices with a 7-bit address like I2C does

Video, including at various resolutions and frame rates

Run a lightweight Python web framework like Flask that serves control pages over the network

Physically move the Pi's GPIO header to the remote device

Disable networking and rely only on the HDMI output

Appended with timestamps to a file or database over time

Held only in a GPIO pin's voltage level permanently

Printed once to the terminal and then discarded

A simple light-level sensor whose resistance changes with brightness

A constant 3.3V power rail for compatible sensors and modules

A variable voltage that changes with GPIO output state

It can rotate precisely in small fixed steps over multiple full rotations

It requires no driver circuitry of any kind

It can only move to one of two positions, like a switch

A seven-segment display driven directly or through an I2C backpack

A full HDMI monitor is always required for any numeric output

The onboard status LED can show any arbitrary number

Repeatedly read the sensor and update the display with the latest values

Read the sensor exactly once and then permanently halt the program

Only update the display when the Pi is rebooted

It writes an operating system image to a microSD card and can preconfigure settings

It permanently overclocks the Pi's processor

It replaces the need for any GPIO pins on the board

Raspberry Pi Quiz