Arduino Nano Vs Raspberry Pi Pico: What's The Difference?

The Raspberry Pi Pico is the new kid on the microcontroller block. How does it compare to the long-established Arduino Nano?
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How to make a servo tester using Attiny85 micro chip

Making a servo tester using an Attiny85 micro chip, Attiny45 also works for this project. This diy servo tester is as good as ...