A common sight in ‘smart homes’, door sensors allow you to detect whether a door is closed or open, enabling the triggering ...

Di et al. report a dual-band infrared photodetector employing size-engineered PbS quantum dots as spectrally selective absorbers in a unipolar barrier configuration, which can switch between near- and ...

Finally, eco-friendly music.

Arduino test code is run to see if the sensors are working properly, with built-in LED flashing when the sensor is triggered, ...