This usually takes not less than 30 seconds. So a 30 seconds delay is intentionally included in the sketch. For other type of sensors this is not necessary, thence remember to delete the line delay(30 ...

In this security light circuit, High level (3.3V) output from SB0061 is used to switch on six 5mm white straw hat LEDs through a solid-state switch realized using transistors T1 & T2. PIR sensor ...

The alarm will go off if both sensors are activated. Using the sensors, the Hydra can distinguish between humans trying to climb the fence and objects striking the fence.

Surveillance is most important security systems in home, industrial, office and public places. In this security system is based on the embedded system along with GSM and sensor networks.

Using two PIR sensors with multiple high-quality lenses, the signal-to-noise ratio can be increased only within that narrow temperature band. Once the room temperature exceeds the surface temperature ...