An offline speech recognition module that enables recognition and interpretation of user spoken commands without access to an external pattern database. It is equipped with 121 commonly used fixed command words and the ability to learn up to 17 new customised instructions. DFRobot SEN0539-EN

A compact buck module that reduces input voltage from 4 to 65 V to a stable 3.3 V at up to 700 mA. It features high efficiency, low quiescent current (<0.2 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 5432

ESC controller module for a brushless motor with a current capacity of up to 120 A. It can work with LiPo packs from 5S to 12S. Uses BLHeli_32 software. FLYCOLOR X-CROSS HV

The SD3031 precision real-time clock (RTC) module. It has an integrated quartz resonator, on-board SRAM and communicates via an I2C interface. DFRobot DFR0998

An efficient step-down converter that reduces the input voltage to 3.3 V at a maximum current of 100 mA, offering high efficiency thanks to its low quiescent current (<20 μA). It supports input voltages from 3.3 V to 65 V, has short circuit and overheating protection, making it a reliable and energy-efficient solution. Pololu 5362

This SPST solid-state relay module allows for safe switching of DC circuits up to 30 V and 11 A, offering galvanic isolation and low conduction resistance (approx. 30 mΩ) thanks to the use of back-to-back MOSFET transistors. It features fast switching time (up to 1 ms), low control current consumption (approx. 10 mA), and the ability to control a signal from 2.7 to 40 V. Its compact design, lack of mechanical components, and the ability to mount on 2.54 mm connectors or screw terminals make the module a durable and quiet solution for systems requiring reliable insulation and long service life. Pololu 5421

This SPST solid-state relay module allows for safe switching of DC circuits up to 60 V and 7 A, offering galvanic isolation and low conduction resistance (approx. 30 mΩ) thanks to the use of back-to-back MOSFET transistors. It features fast switching time (up to 1 ms), low control current consumption (approx. 10 mA), and the ability to control a signal from 2.7 to 40 V. Its compact design, lack of mechanical components, and the ability to mount on 2.54 mm connectors or screw terminals make the module a durable and quiet solution for systems requiring reliable isolation and long service life. Pololu 5420

Uninterruptible power supply (UPS) module, allowing continued operation and safe shutdown of the device after a power failure. AC adapter included. Waveshare UPS Module 3S (EU)

3-channel brush motor controller module with PWM signal mixing function. It allows you to control three DC motors with a current consumption of up to 3 A per channel

The high-voltage converter module enables voltage conversion in the range of 12-30V with an output power of up to 360W and generates sparks up to 5 cm long. The device operates in the frequency range of 30Hz-50KHz and has compact dimensions of 75 x 70.6 x 14 mm.

MT3608 is a compact, efficient step-up voltage converter in a SOT23-6 package, offered in a set of 5 pieces. It allows input voltage conversion from 2 V to 24 V into an output voltage of up to 28 V, with a maximum output current of 2 A.

An advanced speed controller designed to power three-phase brushless motors in various applications, such as driving robots, walking robots or gimbals. Supports input voltage range from 12V to 56V. Maximum constant current is 60A. Makerbase ODrive-S

Module with 16 relays with a maximum switching current of 7 A. It communicates via a USB interface. Numato Lab RL160001-24

This ideal diode module allows for safe connection of two power supplies to a common output point, preventing reverse current flow. Built-in 20mΩ resistors allow for simple voltage compensation and load balancing between the power supplies. The board offers flexible input and output connectors, facilitating integration into industrial and hobby systems requiring high power reliability. Pololu 5398

A DC-DC voltage converter, based on a combination of an LM2577S Step-Up converter and an LM2596S Step-Down converter. The input voltage can range from 3.5 V to 28 V, and the output voltage is adjustable from 1.25 V to 26 V

BMS protection module designed for 13 Li-Ion cells. It has a charging function with balancer option and an over-discharge protection function. Dedicated to an electric bicycle or scooter

BMS protection module designed for 13 Li-Ion cells. It has a charging function with balancer option and an over-discharge protection function. Dedicated to an electric bicycle or scooter

The ICS43434 digital MEMS microphone module with an I2S interface that eliminates the need for A/D conversion and provides clean audio output in the range of 50 Hz to 15 kHz. With channel selection and low current consumption, it is suitable for stereo systems, voice recognition and portable applications. Compatible with popular microcontrollers, it provides high quality sound with low noise. Adafruit 6049

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, and provides an isolated 3.3V or 5V voltage, eliminating the need for an external I2C power supply. 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 5397

Industrial module with 8 relays and 8 digital inputs. It communicates via the RS485 interface and supports communication using the Modbus RTU protocol. Waveshare Modbus RTU Relay (D)