The sensor is designed for indoor air quality testing. The main gas detected is carbon monoxide, alcohol, acetone, thinner, formaldehyde and other slightly toxic gases. It is compatible with 5V and 3.3V power supply. Seeed Studio 101020078

Laser dust sensor is a digital universal particle concentration sensor,it can be used to obtain the number of suspended particulate matter in a unit volume of air within 0.3 to 10 microns, namely the concentration of particulate matter, and output with digital interface, also can output quality data of per particle. DFRobot SEN0177

A sheet of rubber with dimensions of 200x200 mm, changing its resistance during stretching. Adafruit 5464

Module with 1 QTR type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4201

SEN-11207 - Flexiforce Pressure Sensor - 25lbs (1" area)

Non-contact liquid level sensor with Gravity interface. It allows you to detect the level of liquid in non-metallic containers. DFRobot SEN0485

Module with digital barometer BMP384. It enables pressure measurement in the range from 300 to 1250 hPa with 24-bit resolution and communicates via I2C. SparkFun SEN-19833

A module with a rotary encoder and RGB LED lighting for M5Stack sets. It communicates via the I2C interface. M5Stack U135

Soil moisture sensor dedicated to micro:bit. It is supplied with the voltage from 3.3 V to 5 V and communicates via an analog signal. SparkFun SEN-15272

Module with a BME688 sensor for measuring gas concentration, pressure, temperature and humidity. I2C or SPI communication. SparkFun SEN-19096

Module with digital barometer BMP390. It enables pressure measurement from 300 to 1250 hPa and temperature from -40℃ to 85℃. Communicates via I2C or SPI. Adafruit 4816

Module with integrated BME688 gas, pressure, temperature and humidity sensor placed in one MEMS housing. It is equipped with an I2C interface. Adafruit 5046

Module with 1 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4401

Module with 6-axis IMU LSM6DSO sensor, which combines a 3-axis accelerometer and gyroscope, as well as a 9kB FIFO buffer and event handling functions. Communicates via I2C or SPI. SparkFun SEN-18020

Module with 1 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4441

Module with 6 QTRX type optocoupler with analog output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4406

ToF laser rangefinder. It enables detection of many objects, has a field of view of about 25 ° and is able to detect objects at a distance of up to 5 m. Communicating via the I2C interface. Pololu 3416

Module with ENS160 gas sensor for measuring the concentration of carbon dioxide (eCO2) and volatile organic compounds (TVOC) in the air. It communicates via the I2C or SPI interface. Adafruit 5606

Module with 13 QTR type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4153

Module with a distance sensor with a range of up to 130 cm. It has a digital output that generates a pulse with a width proportional to the measured length. Pololu 4071