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Arduino Prices vary depending on version
The Raspberry Pi is a wonderful tool that enables a lot of projects that need a lot of computing horsepower. It even has a few pins broken out that can be controlled by a short bit of Python code. Still, these IO pins aren’t 3.3 Volt tolerant and there’s only one PWM pin. The Arduino, after all these years, still provides a great bridge between the virtual world of the Linux desktop and Internet to physical devices. If you need to control several motors, LED, or servo from a Raspberry Pi, there’s still very few better ways of going about it than an Arduino.