After some experimenting, he came up with a smooth moving robot arm with four steppers controlled from an Arduino Mega and A4988 stepper motor drivers.

Building the Balancing Robot Building a balancing robot involves several steps, starting with assembling the hardware. The Arduino Pro Mini is connected to the MPU-6050 sensor and the stepper motors.

That’s the idea behind [BetaChecker’s] two-axis stepper motor, which looks like it has a lot of potential for some interesting applications.

[Part 1 begins a look at how to interface with some common robotics-type sensors and actuators, and how these can be tied into an example system (in this case, the author's E-2 Autonomous Submarine ...

Using two stepper motors, the camera points the sensor at every “pixel” within the photo and records what it sees. It uses these values to “paint” a picture of whats in front of it!” ...