Proposed features:

• USD $1 - 20 bill accepter
• Thermal printer for BTC/other address QR code
• QR Code scanner
• Ripple (http://www.ripple.com) for multiple cryptocurrency exchange
• Networked - pull current exchange rates, ripple API for transactions

Hardware inventory:

• Pyramid Trilogy Bill Accepter (12VDC)
• Thermal printer
• Raspberry Pi
• Power Supply

References:

• https://github.com/mayosmith/openbitcoinatm - Currency logos and Arduino sketch
• http://openbitcoinatm.wordpress.com/ - Non-network implementation using arduino and stored QR codes
• https://github.com/mayosmith/BitcoinQRMaker - QR code generator
• Trilogy Bill Accepter manual
• https://www.sparkfun.com/products/10438
• Thermal Printer 1
• Thermal Printer 2
• Thermal Printer 3