A non-contact magnetic field sensor with a range of ±1.5 mT and a sensitivity of 1500 mV/mT at 5 V. It offers an analog ratiometric output and a flag signal activated when field thresholds are exceeded. It features a fast response time (20 µs) and a 30 kHz bandwidth with a built-in RC filter. Its compact design, AC/DC capability, and easy mounting make it ideal for energy-efficient and safe current monitoring systems. Pololu 5352

These stackable 0.1" (2.54 mm) female headers are just the right height for connecting  Arduino Uno, Arduino Mega 2560, Arduino Leonardo. The set includes two 1×6 female headers, two 1×8 female headers, and one 1×10 female header, so it has everything necessary for both old- and new-style shields. Pololu 1035

 Pololu 2831

The S7V8F3 step-up/step-down converter regulates the voltage at 3.3 V, supporting an input voltage range of 2.7 V to 11.8 V, making it ideal for battery-powered applications. With an efficiency of over 90% and protection against short circuits and overheating, it provides reliable and energy-efficient operation in a wide range of conditions. Pololu 2122

Pololu Carrier for Sharp GP2Y0D810Z0F and GP2Y0D805Z0F Sensors

Current measurement module using the galvanically isolated Allegro ACS37030LMYATR-065B3 sensor. A combination of Hall-effect sensing and an inductive coil provides DC to 5 MHz measurement bandwidth, a ±65 A range, and a typical response time of 40 ns. The larger carrier board facilitates high-current connections. Pololu 5699

Module with DC motor driver DRV8876. It can work with motors supplied with the voltage from 4.5 to 37 V and current consumption up to 1.1 A. Pololu 4037

Step-Up DC-DC converter module. It has an input voltage of 1.3 to 16 V, an output voltage of 3.3 V and a maximum input of up to 2 A. Pololu 4940

ACS711EX Current Sensor Carrier -31A to +31A

A switching converter that stabilizes a 15V voltage from an input range of 2.6V to 20V. It offers high efficiency of 70-95% and the ability to operate with a continuous input current of up to 900mA and a peak current limit of 2.2A. With a switching frequency of 1.6MHz and a power-saving mode, it is suitable for both high-performance and low-power applications. Pololu 5586

Step-Down DC-DC converter module based on the D36V6F5 chip. Input voltage 5.2..50V, output voltage 5V (max. 600mA). Pololu 3792

Step-Up DC-DC converter module. It has an input voltage of 1.3 to 16 V, an output voltage of 15 V and a maximum input of up to 2 A. Pololu 4946

Isolated DC-DC step-up regulator designed to generate a regulated 12 V output from a 4.5–5.5 V input. It provides up to 100 mA at 12 V, an additional isolated 5 V output, and galvanic isolation between the input and output sides. Pololu 5759

Compact module for bidirectional current measurement using the galvanically isolated Allegro ACS37200LLXTR-200B3 Hall-effect sensor. It provides a ±200 A range, 150 kHz bandwidth, response time below 4 µs, and an extra-low current path resistance of approximately 0.05 mΩ. Pololu 5782

Pololu - 2257

Tamiya 70156 Long Universal Arm Set

Snap-Action Switch with 50mm Lever: 3-Pin, SPDT, 5A

A pair of aluminum brackets with holes for M3 screws for 37D mm gear motors. Pololu 1084

Female-female cable, 40 cm long, with JST-SH 6-pin plug on both sides. Suitable for micro DC motor encoders with gear. Pololu 4768

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 297.92:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.