I2C to Dual UART Module - I2C - 2x UART converter

A small USB-UART TTL converter module based on the CH340E chip with a microUSB connector

DC-DC Step-Down converter module. It has an input voltage from 9 to 45 V, an output voltage of 9 V and a maximum output current of up to 2.9 A. Pololu 4895

Step-Up/Step-Down converter with adjustable output voltage from 0.8 to 33 V, input voltage from 4.5 to 30 V and a maximum current of 5 A. It is equipped with a voltmeter with a display

This synchronous switching step-down (or buck) regulator takes an input voltage of up to 40 V and efficiently reduces it to 3.3 V with an available output current of around 15 A. Pololu 2880

Step-Down converter D36V28F9 with an output voltage of 9 V, an input voltage from 9.8 to 50 V and a maximum output current of 3.4 A. Pololu 3785

Module with a 16-channel GPIO expander with the ability to control LEDs. It communicates via the I2C interface. Waveshare AW9523B IO Expansion Board

This small breakout board couples an Electret microphone (100Hz–10kHz) with a 60x mic preamplifier to amplify the sounds of voice, claps, door knocks or any sounds loud enough to be picked up by a microcontroller’s analog-to-digital converter. Each breakout comes fully assembled and works from 2.7V up to 5.5V. BOB-12758

UART-RS485 converter module, based on a halfduplex SP3485 transceiver. SparkFun BOB-10124

The module contains a 5 V relay with a maximum current of 10 A (250 VAC) and optoisolated inputs, and with jumpers it is possible to select high or low switching. The module is equipped with screw connectors

CS-mount lens and 6 mm focal length. 3MPx resolution. Designed to work with the Raspberry Pi HQ camera. Raspberry Pi PT361060M3MP12

Module with INA219 system with bi-directional current meter

PmodGYRO - 3-Axis Digital Gyroscope

Ultrasonic distance sensor MB1000 with a range from 0 to 645 cm. It has an output in the form of a serial interface, an analog signal or generates an impulse whose duration is proportional to the measured distance. Pololu 723

BOB-08891 - Gas Sensor Breakout Board

The UM7-LT orientation sensor from Redshift Labs is an Attitude and Heading Reference System (AHRS) that contains a three-axis accelerometer, rate gyro, and magnetometer. It combines this data using an Extended Kalman Filter to produce attitude and heading estimates. This LT version of the UM7 does not have an enclosure.