The microcontroller-based concept was chosen because I wanted to scale the sensor system later to suit other applications. Here is the diagram of my Arduino infrared close proximity sensor. As you can ...

[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR ... most PIR sensors (like the one above) come in a simple-to-interface module containing all the ...

The robot uses a whopping 32 IR sensors to follow a black line across a concrete workshop floor, adjusting its path using a steering motor salvaged from a power wheelchair. An Arduino Mega Pro ...