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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.

This HC-SR505 small body sensing module is based on infrared technology perfect to use in your sensing projects eg. alarm, motion camera etc

Add an ear to your project with this well-designed electret microphone amplifier. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on.

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.