and now you say something about rs485, and i'm wondering did i miss some system specs? whose using communication in there grow?
Ok, yes I have a fully automated watering system. well semi. With the webcam I can peek in and see if it needs watering. Don't wanna drown the gals.
Its no longer gravity. Its a bucket with a float valve to maintain a level. Then a pump is switched on for however long I feel it needs. Fed through irrigation lines and adjustable drippers, so I can tailor the feeding per plant.(sucks setting that up) I can adjust it to water the flower room every 4 days and the veg room every 6 days, or any number, if I like.
I can turn on the webcams only when I wanna look then off (better security then on full time)
CO2 level can be maintained and/or adjusted, system turned on/off with a click of the mouse from the road or the touchscreen interface at home. (along with all systems)
Venting fans controlled by temps which tied to the CO2, so CO2 is off during venting. and CO2 an only be on when lights are on.
And now multiply that by two rooms. The PLC is Ethernet/ModBUS enabled, and can talk to a slew of other devices in the house.
But for a quick DIY watering, a bucket, airstone/pump, and a timer.
(job I'm on now is a 4-5 weeker 1000 miles from home. And plants look just wonderful)