In the microcontroller era today, Arduino is more than just a tool to accomplish hobby tasks. There is actually a close relationship between microcontroller technology and home security, since you can ...

Figure 1 shows a way to control a light (or other 120-V ac appliance) with a passive-infrared (PIR) alarm sensor. The original concept was to turn a closet or shop light on whenever someone went into.

Unlike infrared optical sensors that use an LED transmitter and IR receiver, the PIR emits nothing. As its “passive” name suggests, it responds only to infrared energy radiated by the object being ...

The more things change, it seems, the more they stay the same. False alarms and the efforts made to reduce their occurrence have been in the news again recently, with the BSIA launching its intruder ...

The viper space system comprises a packaged kit of one passive infrared movement detector with integral four channel radio receiver, together with two battery-operated Viper sensors, each with ...