Homemade LED grow light with automation system

It is fun to grow herbs at home. It is bit harder to do this in winter time, since there’s not much sunlight. The solution is rather simple, – make artificial grow light.

By combining blue and red LED lights (colors, which wavelength is lower or higher than green), you can make a nifty device to grow herbs in winter time.

The project below combines LED plate and a small automation system, which can be programmed to turn lights on and off at desired time.

System runs on PIC16f628 micro-controller. Program source can be found here: https://www.neblogas.lt/wp-content/uploads/2012/10/main.c

Compiled hex file can be found here: https://www.neblogas.lt/wp-content/uploads/2012/10/grow.rar.

Schematics and PCB:

Board (without PSU):


System setup is done using single button:

To initiate setup mode, press and hold program button till you see a rotating animation on first led display.

After that system will ask you to set current time, then on and off hours.

To change hours and minutes, push configure button as many times, as you need to set correct values. When correct value is set, release button and wait for several seconds till system asks you for a new parameter.

When all configuration is done, system displays “done”, writes values to eeprom and starts the main program cycle.




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