Module with 1 QTRX 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 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4341

Module with 7 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 4447

Module with digital barometer BMP581. It enables pressure measurement in the range from 300 to 1250 hPa with an accuracy of ± 5 Pa and communicates via I2C. SparkFun SEN-20171

Vibrating sensor module, Plug & Play, omni-directional, designed for switching over low-current circuits. DFRobot DFR0027

Module with the MQ3 alcohol concentration sensor. The board is equipped with a Grove connector and communicates via an analog interface. Seeed Studio 101020006

The LIS3DH 12-bit 3-axis capacitive accelerometer module is a great tool for motion detection in your projects, capturing accelerations in three axes (3DoF). Simple configuration with SPI or I2C interface, as well as the ability to work on a breadboard, make the module user-friendly and perfect for various applications, from robotics to wearable devices. SparkFun SEN-20659

Module with a SI1151 light sensor that can detect waves with a wide range of wavelengths: visible and infrared light. The board is equipped with a Grove connector and communicates via the I2C interface. Seeed Studio 101020089

The module enables unidirectional AC and DC current measurement over a range from 0 A to 65 A. XtremeSense™ TMR technology, an electrically isolated current path, 1 MHz bandwidth, and an analogue voltage output support use in systems requiring fast current measurement and high dV/dt immunity. Pololu CT433-HSWF65DR Large Carrier 0–65 A, 3.3 V

A robust sensor for approximate measurement of nitrogen, phosphorus and potassium (NPK) levels in soil, ideal for precision farming and field applications. With a rugged design (IP68), RS485 MODBUS-RTU communication and a wide power supply range, it allows easy integration with Arduino-type systems and operation in harsh environmental conditions. DFRobot SEN0605

Ultrasonic ToF sensor dedicated to the identification of materials at a distance of 2 to 10 cm. It can distinguish between hard and soft materials and transmits information via digital IO (high/low) or UART interface. DFRobot SEN0560

Module with L3G4200D (3-axis gyroscope with digital output)

The INA3221 module, which allows simultaneous measurement of voltage and current for three power supplies via I2C with ±1% precision. With a 13-bit ADC and built-in 0.05Ω shunt resistors, it allows accurate monitoring of currents up to ±3.2A and voltages up to +26VDC. Adafruit 6062

This 3-axis magnetometer enables precise magnetic field measurement in the X, Y, and Z axes within a range of ±133 mT or ±266 mT. The system is equipped with a 12-bit ADC and a CORDIC angular calculation engine, which allows for positioning within a range of 0–360°, making it suitable for applications such as magnetic encoders, robotics, and positioning systems. Communication is via an I2C interface with CRC support and speeds up to 1 MHz, and the module is compatible with 3.3V and 5V logic. STEMMA QT/Qwiic connectors enable quick connection. Adafruit 6490

Laser sensor module with a range of up to 50 m and an accuracy of 1 mm. Communication with the module takes place via the UART interface.

The module enables unidirectional AC and DC current measurement over a range from 0 A to 50 A. XtremeSense™ TMR technology, an electrically isolated current path, 1 MHz bandwidth, and an analogue voltage output support use in systems requiring fast current measurement and high dV/dt immunity. Pololu CT433-HSWF50DR Large Carrier 0–50 A, 3.3 V

Module with 15 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 50 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4215

Module with 1 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 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4141

ACS724LLCTR-2P5AB current sensor module with a DC and AC measurement range from -2.5 to +2.5 A. It communicates via an analog interface. Pololu 4040

Module with 5 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 40 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4205

Heart rate monitor module based on the MAX30102 chip. Powered with the voltage from 3.3 to 5V, communication via the I2C interface.