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This is a TOF-based (time of flight) laser ranging sensor with embedded MCU and ranging algorithm, which is capable of offering up to 40m measuring range, and ±3cm accuracy.

The TCRT5000 IR reflective sensor module detects lines or objects by measuring IR light reflection, outputting a high/low signal via an LM393 comparator to a Raspberry Pi GPIO pin. It is ideal for line-following robots or object detection.

Carbon dioxide is a critical indicator of indoor air quality that can affect human cognitive abilities and well-being. The SCD40/SCD41 are Sensirion's next-generation miniaturized CO2 sensors, offering high precision and cost-effectiveness.

Vishay has a lot of light sensors out there, and this is a nice simple lux sensor that's easy to add to any microcontroller. Most light sensors just give you a number for brighter/darker ambient lighting.

The Adafruit LIS3DH Accelerometer Breakout packs low-power consumption, flexible I2C/SPI connectivity, and advanced motion detection into a compact, STEMMA QT-ready board—perfect for wearables, motion sensing, and battery-powered projects.

Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. The SHT41 sensor is the fourth generation of I2C temperature and humidity sensor from Sensirion.

Non-contact liquid level sensor for Arduino, using a high-speed chip for toxic or high-pressure liquids. Compatible with Gravity interface, with adjustable sensitivity.

Unlike other pressure sensors, you can easily attach a tube to it, to measure air pressure inside a close space. In particular we think this would be a great sensor for use with making DIY assistive tech "Sip & Puff" interfaces, or measuring the pressure within a vacuum chamber or other pressurized container.

This is low cost LDR (Light Dependent Resistor). Basically it is a light sensitive resistor, the resistance will decrease when the surface is expose to light. It is widely used to detect Day or Night, example in automatic car porch light. 

The MQ-7 is a handy breakout board that measures carbon monoxide in the air with great accuracy, tracking levels from 20 up to 2000 ppm. As CO levels rise, the sensor's internal resistance drops, sending an analog signal that development boards like an Arduino can easily read.

A digital hall effect sensor module combining the A3144 hall sensor with an LM393 comparator for reliable magnetic field detection.

This digital temperature and humidity module is a digital output signal containing a calibrated temperature and humidity combined sensor.