[Gord Payne] has one with an elegant sensor solution, it detects finger movement using a light dependent resistor ... circuit a voltage can be read by an Arduino. You can see it in action in ...

In the microcontroller era today, Arduino is more ... 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 ...

The on-board 1-MΩ pull-up resistor calls for a very high-resistance LDR, but the most common ... The code is an Arduino project for the Digispark Attiny85 to turn on a light source when the PIR sensor ...

Because his blinkenlight shield can 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 ...

Most ambient lights and sensors are designed to generate light to even out the picture on the front of the panel and reduce any light bleed from the back of an LCD display. This Arduino-powered ...