Pololu 4817 is a set of two JST SH 5-pin side-entry adapters that allow easy connection of JST SH wires to breadboards and prototype boards. Thanks to the side-entry wire insertion, the adapters are particularly useful in compact designs and projects requiring neat cable routing.

The FS90 analog servo from FEETECH is a great general-purpose micro servo at a great price. Servo horns and associated hardware are included.

Key specs at 6 V: 0.10 sec/60°, 21 oz-in (1.5 kg-cm), 9.0 g.

This item is a pair of motor-holding clips for the Romi chassis in white. These clips snap into the main Romi base plate, and then the motors snap into the clips. It is included as part of the white Romi Chassis Kit.

This power distribution board is designed specifically for the Romi chassis as a convenient way to access the chassis’s battery power and pass that on the rest of the electronics that make up your robot. Pololu 3541  

A USB-to-I²C adapter that allows a computer to act as an I²C bus controller, supporting speeds over 1 MHz, clock stretching, and bidirectional communication. The device offers full galvanic isolation between USB and I²C, protecting the computer from damage and interference. With JST SH and goldpin connectors, USB-C support, a virtual serial port, and a Python library, the adapter is a versatile tool for working with I²C devices in both hobbyist and professional projects. Pololu 5396

A compact voltage converter module that reduces input voltage from 6.3 to 65 V to a stable 6 V at currents up to 700 mA. It features high efficiency, low quiescent current (<0.4 mA), and short-circuit and thermal protection, ensuring safe and efficient operation. Its small size and ease of integration make it ideal for mobile devices, battery-powered designs, and systems requiring stable power. Pololu 5434

Pololu 5651 is an adapter that enables integration of JST PH and SH wires with circuits using a 2.54 mm pitch. Thanks to its compact design and the side-entry PH connector, it is suitable for projects with limited space and where wires need to be routed parallel to the PCB.

A stepper motor driver for precise control of bipolar motors, offering six microstepping modes (from full to 1/32). It operates within a voltage range of 8.2V to 44V and delivers up to 1.5A per phase without cooling or up to 2.2A with a heatsink/fan, ensuring smooth and stable operation even at high speeds. Compatible with the popular A4988 and DRV8825 drivers, with an integrated regulator and overheating, overload, and short circuit protection, the TB67S581FNG is a reliable and versatile solution for applications requiring precise motion control. Pololu 2989

Twisted Servo Extension Cable 24" Male - Female

A-Star 328P Micro is a small board based on ATmega 328PB microcontroller (Flash, 32 KB, SRAM, 2.5 KB, EEPROM, 1KB, 12 MHz). The system has a loaded bootloader compatible with Arduino. The board has 24 I / O ports (of which 9 pins can be used for PWM outputs and 8 pins for analog inputs). Supply voltage 3.8 ... 15 V. The board works with 3.3 V voltage. Pololu 3163

Single-channel IR reflectance sensor using an infrared LED and phototransistor to detect changes in surface reflectivity, generating an analog output voltage from 0–VCC. Operates at 2.9–5.5 V, with an optimal sensing distance of ~5 mm (up to 30 mm max), adjustable IR emitter brightness, and a 4-pin JST SH connector, designed for line detection, edge detection, and obstacle sensing in robotics and automation projects. Pololu 4240

Single-channel reflectance sensor from the QTR-MD series, 8 mm wide, featuring an RC output and a side-entry connector. Designed for line detection, surface contrast measurement, and edge detection in mobile robotics and automation systems. Pololu 4140

Reflectance sensor module with a single QTRX sensor and RC output, designed for detecting differences in surface reflectivity. Supply voltage 2.9–5.5V, low current consumption, version with side-entry JST-SH connector. Pololu 4340

A-Star 328P Micro is a small board based on ATmega 328PB microcontroller (Flash, 32 KB, SRAM, 2.5 KB, EEPROM, 1KB, 16 MHz). The system has a loaded bootloader compatible with Arduino. The board has 24 I / O ports (of which 9 pins can be used for PWM outputs and 8 pins for analog inputs). Supply voltage 5.5 ... 15 V. The board works with 5 volts logic voltage. Pololu 3160

A-Star 328P Micro is a small board based on ATmega 328PB microcontroller. The system has a loaded bootloader compatible with Arduino. The board has 24 I / O ports . The circuit board works with 5 volts logic voltage. Polol 3161

A precision reflective sensor utilizing an IR diode and a phototransistor to measure light reflected from a surface. It offers an analog voltage output proportional to the reflected light and an optimal measurement range of 10 mm. Its low power consumption and compact size make it ideal for line-follower robots, edge detection systems, and educational projects. Pololu 4440

A compact relay module with an Omron G5LE-14-DC5 relay, capable of controlling loads up to 10 A with a 5 V coil voltage. Thanks to a BSS138K MOSFET transistor, it can be activated by a 2.5 V to 20 V logic signal, facilitating interoperability with microcontrollers. The module is equipped with 5 mm screw terminals, a 3-pin JST SH connector, and LEDs to indicate operation. Pololu 5662

A compact Omron G5LE-14-DC12 relay module that allows you to control loads up to 10 A with a coil voltage of 12 V. Thanks to the BSS138K MOSFET transistor, it can be activated by a 2.5 V to 20 V logic signal, facilitating interoperability with microcontrollers. The module is equipped with 5 mm screw terminals, a 3-pin JST SH connector, and LEDs to indicate operation. Pololu 5663

A-Star 328P Micro is a small board based on ATmega 328PB microcontroller (Flash, 32 KB, SRAM, 2.5 KB, EEPROM, 1KB, 8 MHz). The system has a loaded bootloader compatible with Arduino. The board has 24 I / O ports (of which 9 pins can be used for PWM outputs and 8 pins for analog inputs). Supply voltage 3.8-15 V. The board works with 3.3 V voltage. Pololu 3162

The S9V11F3S5C3 switching step-up/step-down regulator efficiently produces a fixed 3.3 V (default) or 5 V (selectable) output whether it is higher or lower than the input voltage, which can range from 3 V to 16 V. The regulator also has fixed 3.3 V low-voltage cutoff with hysteresis that can be used to prevent battery over-discharge.