The FS90R is a micro servo that has been built by FEETECH (formerly known as Fitec) specifically for continuous rotation, offering an inexpensive and easy way to get your miniature robot moving or small turret spinning. Key specs at 6 V: 130 RPM (no-load), 21 oz-in (1.5 kg-cm), 9 g

This connector is a single-row, 40-pin, straight male header strip that can be broken into smaller strips.

These male pins can be crimped on 22-28AWG wires and snapped into Pololu's crimp connector housings to create custom cables that are compatible with standard 0.1"-pitch headers and solderless breadboards. Pololu's wires with pre-crimped terminals use these same pins. One male crimp pin pack consists of 100 pins.

This wire stripper and cutter works with six standard wire sizes from 20 to 30 AWG solid (22 to 32 AWG stranded). It has curved, cushioned handles for added comfort, and the serrated nose can be used to bend and shape wire.

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.7″, but it allows a typical continuous output current of up to 2.5 A. Typical efficiencies of 85% to 95% make this regulator well suited for powering moderate loads like sensors or small motors. High efficiencies are maintained at light loads by dynamically changing the switching frequency, and an optional shutdown pin enables a low-power state with a current draw of a few hundred microamps.

These three-pin housings work with Pololu's wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 25.

This 6" (15cm) cable has two 26AWG conductors with a 2.5mm-pitch 2-pin female JST XH-style connector. The spacing is very close to 0.1", which means this connector will work with 0.1" male header pins and standard perfboards and solderless breadboards. The other ends of the wires are unterminated; they can be cut to length to match your application. The red and black wires are twisted together to reduce noise.

The S7V8F3 switching step-up/step-down regulator efficiently produces a fixed 3.3 V output from input voltages between 2.7 V and 11.8 V. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below the regulated voltage. The compact (0.45″ × 0.65″) module has a typical efficiency of over 90% and can deliver 500 mA to 1 A across most of the input voltage range.

This breakout board for TI’s DRV8825 microstepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and six microstep resolutions (down to 1/32-step). It operates from 8.2 V to 45 V and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow (rated for up to 2.2 A per coil with sufficient additional cooling). The driver has a pinout and interface that are nearly identical to those of Pololu's A4988 stepper motor driver carriers, so it can be used as a higher-performance drop-in replacement for those boards in many applications. This board ships with 0.1″ male header pins included but not soldered in.