Basics

An Open Source Software and Hardware Project making a Irrigation Controller
Largely aimed at Irrigation Sprinkler Systems in Lawns , although could be used for Drip Irrigation lines etc
Allows for IOT use, although can be used as a "dumb" controller as well
It can be build fully DIY with a Raspberry Pi and some other OTS Electronic Components, or a Premade module can be purchased
The Pipes/Valves/Pumps and all that + Wires to them are still needed if using this in new construction

Sourcing

The Product Page on the OpenSprinkler Project Website
- As of this edit says ~150.00 – $193.00 USD depending upon Voltage and Adapters Selected
- A Volume Discount is also mentioned, quote:
  - "(minimum quantity: discount per unit)
    - 5+: 4% off
    - 10+: 8% off
    - 25+: 12% off
    - 50+: 16% off"
User: Eric here, i plugged everything in and it came out to $186.95 (including shipping)

GardenBot and FarmBot for more Garden Oriented Designs
- AquaShield and HydroBot for more Soil-Free Agriculture (ie Hydroponics , Aquaponics etc) Oriented Designs
SMS controlled Wireless Irrigation System (A Similar Concept using a "Candy Bar" Cell Phone and an Arduino as well as some other components)