LED brightness control

Based on a previous project (The IRDA-Print) i made a simple, but very effective brightness controller.

 
I use the following circuit in order to always have the same brightness in the room, no matter how the weather outside is and how late it is. :-)

Following is certainly not my best youtube video, but it shows how it adjusts the brightness.



 schematic

(Pic shows the schematic of the LDR circuit)

The function:
The capacitor is charged
. Thereafter, the GIO is switched to "input" and now a program loop continues until the capacitor is discharged. Meanwhile, a variable is incremented. Depending on the light of the value of the variable is now an indicator of the ambient brightness.

 

 

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