What many of us may be unaware of though is that an LED is also a photodiode, and can even be persuaded to generate usable quantities of power. [Voltative] takes a look at this phenomenon with a ...

In order to help his friend prepare for a talk at DEFCON this weekend, [Craig] built an IR photodiode amplifier circuit. The circuit extended the detection range of the hack from a few inches to ...

For the existing photoelectric smoke detector, an infrared light source and a light-sensing photodiode are placed in opposite directions inside the detector. When particles, such as smoke ...