BUILDING BT RECEIVERTO BUILD BT RECEIVER YOU WILL NEED:– An Arduino Board like that: Arduino Pro Mini 328 – 3.3V/8MHz– A USB Host Shield from Oleg Mazurov’s Circuitathome.com site– An compatible bluetooth module like that: Bluetooth SMD Module – RN-42for Bluetooth Module HC-06 check out eBay– Pololu 5V Step-Up Voltage Regulator NCP1402

Source: Building BT Receiver | DslrSystems