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 ...

In order to accomplish this, [Bas] is using a light-dependent resistor and a pull-up resistor to create a resistance bridge, which is then connected to an analog input pin on a Raspberry Pi Pico.

Thankfully, Arduino projects ... typically found in any circuit that uses LEDs. Without a resistor, LEDs tend to shine too brightly, overheat, and potentially blow up if left for an extended ...

You usually need a high precision resistor (1% or better ... Moser] has a method that lets you pull it off with an Arduino and an LM339 quad comparator. The circuit works by feeding a signal ...