Module with 2 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 4202

Liquid level sensor (up to 124 mm) with analog output. The output voltage varies in proportion to the liquid level. The measuring element is placed in a plastic housing. Adafruit 3828

Module with 9-axis IMU dedicated to Feather plates. It connects the ISM330DHCX (accelerometer and gyroscope) and LIS3MDL (magnetometer) systems. Communication via the I2C interface. Adafruit 4569

Module with a digital temperature and humidity sensor based on the SHTC3 system. Communication takes place via the I2C interface. SparkFun SEN-16467

The SparkFun Load Sensor Combinator is a bare PCB that combines four load sensors into a standard four-wire Wheatstone bridge configuration. BOB-13878

Module with 11 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 4111

Module with a Panasonic sensor with an 8x8 IR thermal matrix (AMG8833 chip) with a built-in 3.3 V controller and a logic level translator. The I2C interface is used for communication. Adafruit 3538

Soil moisture sensor with analogue output. It has a shape resembling a fork, which makes it easy to put it in the ground. The voltage level of the analog output increases in proportion to the ground moisture level. The sensor can be used in an automatic watering system. Version with a 3.5 mm ARK connector. SEN-13637

Module with 9-axis IMU ICM-20948 sensor. The chip is an integrated 3-axis accelerometer, gyroscope and magnetometer and a digital motion processor DMP (Digital Motion Processor). Communication via I2C or SPI. SparkFun SEN-15335

The SST Liquid Level Sensor provides single point liquid detection via a TTL compatible push/pull output. This optical liquid level sensor features a miniature design that allows for installation in areas where space is limited. SEN-13835

A small module with a GY-PAJ7620U2 gesture detection sensor. Can recognize 9 gestures. Communication via the I2C interface.

Module with 16 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 50 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4156

BME280 integrates onboard temperature sensor, humidity sensor and barometer. It provides both SPI and I2C interfaces; and can be widely used in environmental monitoring, story height measurement and Internet of Things (IoT) control and so on. SEN0236

Module with an analog light sensor. It consists of a photoresistor and a LED. Equipped with a Gravity connector. DFRobot DFR0022

A round, flexible, pressure sensor that can be used to realize very sensitive force detection. The sensor is durable and designed to detect static and dynamic pressure at high reaction speed. DFRobot SEN0298

Module with an analog MQ7 carbon monoxide sensor. It is powered with the voltage of 5 V and has an analog output. DFRobot SEN0132

Module with liquid turbidity sensor. It allows you to measure the amount of suspended particles in a liquid. The sensor can operate in two modes: digital and analog.

The module with the MAX30100 chip that monitors the oxygen content in the blood and the heart rate. It consists of two LED diodes, a photodetector, optimized optics and low noise analog signal processing. modMAX30100

Digital gas sensor solution that senses a wide range of Total Volatile Organic Compounds (TVOCs), including equivalent carbon dioxide (eCO2) and metal oxide (MOX) levels, intended for indoor air quality monitoring in personal devices such as watches and phones, but we’ve put it on a breakout board so you can use it as a regular I2C device. SEN-14193

Module with a reflection sensor (line sensor) RS-06WD. The board is equipped with a Grove connector and communicates via a digital interface. Seeed Studio 101020172