Radar, this project from [Mateusz Juszczyk] isn’t actually using radar. But thanks to the round LCD this desktop gadget does ...

These are some great DIY projects that you can do for cheap.

Arduino Portenta H7 M7 Core v1.8.5 Supported Official Arduino support colcon.meta Arduino Nano RP2040 Connect v1.8.5 Supported Official Arduino support colcon_verylowmem.meta OpenCR v1.4.16 Supported ...

Setting it up is really easy.

Learn how to repurpose your spare ESP32 boards into cost-effective presence detection sensors using the Tommy Sense ...

Abstract: This paper evaluates the development of a Low-cost security system using small PIR (Pyroelectric Infrared) sensor built around a microcontroller. The low-power PIR detectors take advantage ...

I purchased one of each of these cheap sensors recently from aliexpress for testing purposes. Compared with the ubiquitous HC-SR04 (*), I liked the idea of having a combined emitter/receiver, i.e.

Abstract: Pyroelectric infrared (PIR) sensors are widely used as a simple but powerful people presence triggers, e.g., automatic lighting systems. In particular, by alternating the effective ...

Chances are, you’ve heard of the police code 10-4, which means “affirmative” or an acknowledgment of a message. But if you hear a police officer say 10-33, there’s a police emergency underway. However ...