Efficient step-down converter that reduces the input voltage from up to 45 V to a regulated output voltage range from 1.4 to 7 V, offering high efficiency and a maximum continuous current of 3.8 A. It has built-in protection against reverse polarity, overload and short circuit, and the spread spectrum function reduces EMI interference. The module is equipped with an additional potentiometer for adjusting the cut-off voltage. Pololu 4852

Switch module with an interlock. DFRobot DFR0423

ARM Cortex-M3, 200 kB SRAM, 2x HS USB, Ethernet, CAN, AES, LBGA256, NXP, RoHS

Module with 8-digit 7-segment LED display. The board is equipped with a 74HC595 driver and communicates via a digital interface

The Sharp GP2Y0A02YK0F sensor enables precise distance measurement in the range of 20–150 cm using an analog output. Its stable characteristics and ease of integration make it a popular solution in mobile robotics and obstacle detection systems.

BLE Beacon, which emits Bluetooth Low Energy signals, enabling discovery by Bluetooth devices such as smartphones or ESP32 without the need for pairing. With a built-in I2C interface and an 11-bit ADC, it allows data collection from various sensors, and its low power consumption (650nA in sleep mode) ensures long-lasting operation on a single battery, ideal for applications requiring mobility and long range. DFRobot TEL0168

Touch keyboard module with 16 buttons based on the TTP229 chip. It is equipped with a connector with derived signals and a power supply diode

DC-DC step-down converter module 5V 16A used to convert energy from 6-24V input voltage to stable 5V, providing up to 16A current. Thanks to high conversion efficiency (over 90%) and low ripple (<20mV), it is ideal for powering sensitive devices in applications such as robotics, drones or LED lighting systems. Additionally, built-in overheating and short-circuit protection mechanisms ensure reliable operation even in difficult conditions. DFRobot DFR1202

Waveshare BLE4.0 Bluetooth 2.4G Mother Board, provides I/O expansion connectors and various interfaces. BLE400

ARM Cortex-M3 CPU, Low power, 384kB Flash, 48kB RAM, 12 kB EEPROM, LCD, USB, 5xUART, 2xI2C, 3xSPI, ADC, DAC, LQFP144, STM, RoHS

Yellow mechanical keyboard switches. They can be used for a wide range of projects, including when building a proprietary, non-standard mechanical keyboard.

The Step-Up/Step-DownS7V8F5 Buck Voltage Regulator module with output voltage 5V, input voltage range of 2.7-11.8V and a maximum output current of 0.5-1A. Pololu 2123

ARM Cortex-M3 CPU, Low power, 384kB Flash, 48kB RAM, 12 kB EEPROM, LCD, USB, 5xUART, 2xI2C, 3xSPI, ADC, DAC, LQFP100, STM, RoHS

Universal plate, prototype 800 contact fields, size 125x160 mm on a metal stand. WBU-502L

A connector that allows you to connect the cable to the existing installation without having to cut the cable. Suitable for wires with a cross-section of 0.5-1.5mm2

Module with TLV493D 3-axis magnetic field sensor. Equipped with a STEMMA QT connector, it communicates via the I2C interface. Adafruit 4366

DC-AC converter, also referred to as an inverter. It converts a constant voltage (DC) of 12 V to an alternating voltage (AC) of 110 V, 200 V, 220 V or 280 V

The module is designed to support incremental encoders. It reads the rotation of the encoder and transmits the information via the I2C interface. Adafruit 4991

Two-channel driver of direct current (DC) motors with a working voltage from 7 to 30 V and a maximum continuous current of 10 A. It can be controlled by a PWM signal or by buttons. Cytron MDDRC10