In the microcontroller era today, Arduino ... light level is below a threshold value. Here an LDR (Light Dependent Resistor) is used to measure the light level. The alarm system is triggered when a ...

The “snooper” here is an ordinary passive infrared (PIR) motion detector module that detects motion by measuring changes ... The code is an Arduino project for the Digispark Attiny85 to turn on a ...

We know that measuring ... be used as a light sensor, all that’s needed is a mirror and a pretty long line of sight. There’s a few problems with the setup though: with the Arduino running ...

There are loads of unique sensors available on the market for Arduino boards ... intruder detection to home automation. PIR motion sensors use infrared light to detect movement.