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The legs are retractable and are actuated by tiny servo motors inside the body. [Greg06] even included an ultrasonic distance sensor for the obstacle avoidance mechanism.
The build relies on the classic Arduino Uno microcontroller, which talks to a HC-SR04 ultrasonic sensor module and two infrared sensors in order to track a human target and follow it around.
The robot's eyes and ears are provided by an ultrasonic sensor and an infrared sensor, both of which can probably be purchased from electronics hobby stores. Or you can also make your own, for ...
Components and Construction The DIY Arduino robot lawn mower project involves several key components, including an Arduino microcontroller, ultrasonic sensors, and motor drivers.