In the microcontroller era today, Arduino ... at its sensor input port. As indicated, our system requires a “Logic High (H)” level input to wake up. The best sensor you can use to detect an intrusion ...

The LDR must be soldered in a way that it can comfortably see ambient light through the Fresnel lens. To be frank, using ... Arduino IDE compatibility. The code is an Arduino project for the Digispark ...

[Gord Payne] has one with an elegant sensor ... reaching the LDR from the LED decreases as the pipe is bent, and with a simple divider circuit a voltage can be read by an Arduino.