Breakout Board for ADMP401 MEMS Microphone, SparkFun

Module with 8 relays with a voltage of 12 V and a load of up to 10 A. The board communicates via the Ethernet interface. Numato Lab 8ETHRL001

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 6 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.

Mini MP3 player with 128 MB built-in memory. It can work as a separate device and play sounds or be controlled via the UART serial interface. DFRobot DFR0768

Module with 8 relays 12 V with a maximum switching current of 7 A. Numato Lab RL40004

Module with an AB class amplifier based on the Boomer® LM4853 system. It can work in two modes: mono (power 1.5 W, load 4 Ω) or stereo (power 300 mW, load 8 Ω). It has a potentiometer for power control and gain control for the left and right channel. SparkFun DEV-14475

6-channel module with relays, designed to work with the Raspberry Pi. It can switch 250VAC/7A or 30VDC/10A signals. SB Components 21802

Small size driver module TB67S279FTG stepper motor powered with 10 ... 47V voltage and working current 1.1A. The controller allows you to control the motor movement up to 7 different resolutions (up to 1/32 of a step). Polol 3098

An audio module with a DAC converter designed to work with the Raspberry Pi. Supports I2S/DSD/Coaxial input, Analog/Coaxial/Optical/I2S output, and has 384K/32Bit decoding function. DFRobot DFR0941

A two-channel DC motor controller with an I2C interface. It is powered from 4.5 V to 48 V and can deliver up to 1.8 A per motor. A board with soldered connectors. Pololu 5064

The module with 4 relays, designed to work with the micro:bit. It allows you to control devices with operating parameters up to 120VAC/2A or 24VDC/2A. SB Components 14118

Relay module for the WeMos D1 Mini WiFi set

Module with electret microphone and LM393 amplifier that will allow you to detect voice, clap, slam doors and other sounds using analog or digital output

Module with an analog sound intensity sensor. It enables measurement in the range from 30 dB to 130 dB with a measurement error of ± 1.5 dB. The module returns the output voltage in the range of 0.6 to 2.6 V. DFRobot SEN0232

The protection system for four Li-Ion cells with a voltage of 14.8 V. The module has the function of charging the cells, discharging and protecting against excessive discharge. The cells can be discharged with a continuous current of up to 18 A

KAmodM41T82 is a module with the STMicroelectronics M41T82 RTC clock. The chip allows precise timing, and an additional battery connector allows you to maintain the power supply when the main power is turned off. Communication with the module is realized via I2C bus.

Step-Down XL4005 converter module with adjustable output voltage in the range from 0.8 to 30 V with a wide input voltage range from 4.5 to 30 V and a maximum output current of 5 A