I updated my source code here: GitHub - nemik/arduinoponics: Arduino code to control a pump for hydroponics purposes.
I put in a relay for AC power to turn some lights on and off as Chicago isn't getting much sun these days.
Right now there is a cron script on the router than turns the lights on every morning at 5:30 and turns them off at 21:00. The toggling of the lights has also been added as a button on the OpenWRT admin menu.