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There are a lot of resistors that rapidly change resistance based on something that they are exposed to. Light Dependent Resistors LDRs, also called photoresistors, change resistance based on the level of light falling on them.
If you put an LDR in series with an LED, it will drop resistance, and pass more current, when more light falls on it. The LED will get brighter.
The LDR will probably pass a lot of current by itself when exposed to very bright light. It’s resistance can get very low. Therefore, I added a 220Ω resistor in series with it, to always have at least 220Ω of resistance protecting the LED.
The LED will probably turn off fully when it get’s dark enough.
Kit I got my 5528, and other light dependent resistors from. An affiliate link ad that supports this site.
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