[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.

To create a graph based on the received serial data from Arduino Serial Plotter, you need to program Arduino to read a sensor and direct the data to the Serial Port. Here, a standard light-dependent ...

In the microcontroller era today, Arduino is ... Here an LDR (Light Dependent Resistor) is used to measure the light level. The alarm system is triggered when a “Logic High (H)” level signal is ...