I recently had to build an infrared close proximity sensor that could tell if something was dropped in a parcel delivery drop box. After some searching, I ended up using a microcontroller and a piece ...

Here’s the front-end circuit of the IR sniffer. The hardware will capture an IR code and retransmit it on demand. The schematic isn’t particularly complex. The IR receiver module is represented here ...

[youtube=http://www.youtube.com/watch?v=pIb1scnD67o&w=470] [Rob] lives in a 100-year-old house, and with these antique lath and plaster walls and old window frames ...