DIY Arduino Aquarium Controller Part11: PWM LED dimming, opto-isolation, & light scheduling

This covers the PWM dimmable LED Light construction, opto-isolation of the PWM signal from Arduino, and the code to control the light scheduling and dimming.

Lights are constructed similar to the one detailed in the “DIY light fixture” video linked below, but use PWM dimmable DC drivers (also linked below) and are powered by 12v DC from a PC power supply.

Links:
DIY light fixture vid:
   • DIY LED light fixture for aquarium: 1...  

3w led driver:
http://store3.sure-electronics.com/le...

alternate driver:
https://www.ebay.com/sch/i.html?_from...

4N35 optocoupler/optoisolator:
https://www.taydaelectronics.com/4n35...

PWM dimmer arduino sketch:
https://create.arduino.cc/editor/Blue...

Main Tank routine v05 sketch:
https://create.arduino.cc/editor/Blue...

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