Arduino vs Raspberry Pi: Which Should You Use for Your Project?
The real difference between a microcontroller (Arduino) and a single-board computer (Raspberry Pi), with a side-by-side comparison, project examples and when to use both together.
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One-line answer: an Arduino is a microcontroller that runs one program the instant it gets power, ideal for controlling motors, sensors and lights in real time. A Raspberry Pi is a full Linux computer, ideal for cameras, networking, screens and anything that needs an operating system. Many great projects use both.
Side by side
| Arduino Uno R4 | Raspberry Pi 5 | |
|---|---|---|
| Type | Microcontroller board | Single-board computer |
| Runs | One sketch (C/C++), no operating system | Linux (Raspberry Pi OS), many programs at once |
| Starts up | Instantly | Boots in seconds; needs proper shutdown |
| Power use | Very low; can run for long periods on batteries | Several watts; needs a solid 5 V supply |
| Pins | Digital I/O, PWM, analog inputs (5 V logic) | GPIO (3.3 V logic), no built-in analog inputs |
| Networking, video, USB devices | Limited (Wi-Fi on some models) | Ethernet, Wi-Fi, Bluetooth, dual 4K HDMI, USB 3 |
| Best language | Arduino C/C++ (MicroPython on some boards) | Python, plus almost anything Linux runs |
Choose Arduino when…
- You need precise timing: motors, servos, LED strips, reading sensors quickly.
- It must run on batteries for a long time.
- It should "just work" when switched on, with no SD card to corrupt.
- Examples: a line follower robot, a plant watering system, a game controller, a weather sensor.
Choose Raspberry Pi when…
- You need a camera, a screen, a web server, a database or internet access.
- You want to run existing software: Home Assistant, Pi-hole, media servers.
- You want computer vision or voice processing.
- See our Raspberry Pi models guide.
Use both together
A common robot design puts a Raspberry Pi in charge of the "brain" (camera, decisions, Wi-Fi control) and an Arduino in charge of the "muscles" (motors and sensors), talking over USB serial. Each does what it is best at.
Other boards worth knowing
- ESP32: a cheap microcontroller with built-in Wi-Fi and Bluetooth, great for smart-home gadgets.
- Raspberry Pi Pico 2: Raspberry Pi's own low-cost microcontroller, programmable in MicroPython or C.
- Arduino Nano: the Uno's tiny sibling, easy to fit inside small builds.
Quick answers
Which is easier for a complete beginner?
Arduino, for electronics: plug in, upload a sketch, blink an LED. Raspberry Pi is easier if you mostly want to learn Python and Linux.
Can an Arduino connect to the internet?
Some can: the Uno R4 WiFi, Nano ESP32 and ESP32-based boards have Wi-Fi built in.