This quadrature encoder board is designed to hold two infrared reflectance sensors inside the hub of a Pololu 42×19mm wheel and measure the movement of the twelve teeth along the wheel’s r
This silicon tire makes a great replacement for your worn RW2-series tires.
A 3A, 8-45V bipolar stepper motor driver - this breakout packs a mean punch for it's size! It has built-in overcurrent detection, undervoltage detection, overtemperature detection, stall detection, a 5-bit ADC, and a switch input, microstepping support and PWM drive voltage limiting.
You got some really big motors you want to control? Take a look at the Sabertooth dual 25A motor driver, able to supply 25A each to two motors, at up to 30V. It's a brute, but it's smart enough to talk in many ways!
The Sabertooth 2x5 motor driver is a compact, flexible way to drive motors up to 5A. It talks in 4 methods, so you're sure to be able to use it for your project.
The HB-25 Motor Controller in a fast and inexpensive way to control a DC motor up to 25 Amps.
The jrk 21v3 motor controller is a highly configurable brushed DC motor controller that supports four interface modes: USB, logic-level serial, analog voltage, and hobby radio control (RC).
The PWMPAL provides up to 4 channels of PWM control to any microcontroller.
Just need to make some motors move with your Arduino? Here's a simple way from SparkFun - the Ardumoto!