Here are all of the computational hardware components for the elephant-detection device: Raspberry Pi 3 Model B, Raspberry Pi 5MP Camera Module -> CSI interface on Pi, XBee 2mW Wire Antenna, SparkFun XBee Explorer Dongle (XBee -> USB).

Cost of computational hardware components:

• Xbee 2mW Module with Whip Antenna (Series ZB) £26
• XBee Explorer Dongle £28
• Raspberry Pi 3 £28
• Raspberry Pi 5MP Camera Module £19

Total: £101

Power supply components:

• 6W 2V Solar Panel
• USB / DC / Solar Lithium Ion/Polymer charger
• Lithium Ion Polymer Battery - 3.7v 2500mAh
• PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+

Also required is a PIR sensor (£2)