Check out the infrared alarm circuit too. For a wider range of the infrared ... IC1 output will then be a perfect rectangular wave. Working with the receiver and the transmitter at the same time feed ...

This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The ...

This module uses a PIC12F microcontroller to take the signal input and translate it back into infrared. [Peter]’s system can be set up as a single receiver, and single transmitter, single ...