Adafruit has shared many guides showing you how to build and program your own robots and wearables. Their latest project shows you how to build a Guardian robot inspired by the Legend of Zelda Breath of The Wild game. It has a head that freely rotates and an eye that randomly blinks. The random motion of the servo and eye blinks give the impression that the robot is searching.
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You are going to need an Adafruit Trinket, Micro servo, LEDs, resistors, battery, and a few other simple components to complete this project.
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