You would have probably read about the SONAR that’s used in ships. By taking the same concept into a small form factor we get a distance sensor. This sensor is available in multiple variants and I’ll ...

[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 ...

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 ...