Quantity   Component name
1 × Raspberry Pi 2 Model B Generic, cheap computer
1 × 120vac/24vac transformer Provides 24vac for sprinkler valve solenoids
1 × Orbit sprinkler controller housing Everything goes in here
2 × 24vac/12vdc converters 12v for for USB relay board, future LCD display, and 5v converter
1 × 12vdc/5vdc buck converter 5v for the Raspberry Pi
1 × USB relay board Allows the Raspberry Pi to switch the sprinkler valves
1 × binding post Attachment for common wire
1 × USB wireless ethernet dongle
1 × USB cable Connect the Raspberry Pi to the relay board
1 × misc wires