The prism is rotated by a servo motor, which exposes the sample to the full rainbow, while an Arduino uses a light-dependent resistor to measure how much light makes it through the sample.

One advantage of using Arduino as a security system is the flexibility ... system only when ambient light level is below a threshold value. Here an LDR (Light Dependent Resistor) is used to measure ...

Furthermore, the vacant solder pads near the three-pin interface header is for mounting a light-dependent resistor (LDR/CdS cell ... on-board voltage regulator, and Arduino IDE compatibility. The code ...

In that case, this Arduino-based smart light might be more your cup of tea. The idea behind this project is to build a lightbulb controller using a light-dependent resistor (LDR). The LDR ...

It is a pretty common first project to use an Arduino (or similar) to blink an LED. Which, of course, brings taunts of: you could have used a 555! You can, of course, also use any sort of ...

Messing around with Arduino ... (LEDs won't light up or will be too dim, etc). Too much and things probably won't work right and also might short out and create a fire risk. Resistor values ...