Here is the diagram of my Arduino infrared close proximity sensor. As you can see, ... (TP4), which is logic-low (L) by default, shifts to a logic-high (H) state for a while when an object appears ...

The software part employs three development platforms: Arduino IDE, Atmel Studio 7, and Processing. System-wise, everything plugged together in a sequence that made sense and just worked.

The [Libelium] team wanted to help people in Japan measure radiation in their surroundings following the nuclear accident in Fukushima. Because of the affordability and seeming ubiquity of the Ardu… ...