To sense animals moving I wanted to create a simple IR sensor that would trigger a monostable to generate a rather long pulse when an animal passed by. Further, while the animal remained in front of ...

He then programmed an ATtiny13 to decode messages received by the IR sensor, sending them to his laptop via USB. He packaged things inside a tiny mint tin, which he hangs from a desk lamp while in ...

This setup creates a reflective sensor. When an object nears the board, the infrared light from the emitters reflects off of it and onto the phototransistor.

One simple option is to have a series capacitor in the base (Fig. 4). 4. IR LED driving circuit with decoupling capacitor to avoid dc levels. IR light receiver ...

The circuit in Figure 1 forms a highpass filter with the output impedance of the serial port and the capacitor. The positive pulses drive one IR LED; the negative pulses drive the other. Both should ...