This is the "host computer" of FarmBot. You might also call it FarmBot's brain. The Raspberry Pi runs FarmBot OS, communicates with the web application over ethernet or WiFi, and talks to the Farmduino over a USB serial connection.
CPU: 1.2Ghz Quad Core Broadcom BCM2837 64-bit ARMv8 processor
RAM: 1GB LPDDR2 (900 MHz)
WiFi: 2.4GHz 802.11n wireless, BCM43143 chip
Bluetooth: Bluetooth 4.1 Classic, Bluetooth low energy (BLE)
Ethernet: Built-in 10/100 Ethernet