DIY Arduino Aquarium Controller Part2: Prototype LED Light and Control unit

This covers the materials, construction, and Arduino programming of the ATmega328 powered LED light and controller prototype. It also covers some basics of the DS1307 RTC integration and task scheduling.
Part2 of my How-to series for Arduino Mega and Raspberry Pi based DIY Aquarium Controller.

Links:

Simple Buck LED Driver With PWM Input
http://www.instructables.com/id/Poorm...

How to Build a Real-time Clock Circuit with a DS1307 Chip
http://www.learningaboutelectronics.c...

Using a standalone ATmega328 with Arduino bootloader
https://www.arduino.cc/en/Main/Standa...

Lm7805 voltage regulator
http://www.learningaboutelectronics.c...

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Source code:
https://create.arduino.cc/editor/Blue...