At first, we wanted to flash the Easy Button, but after tearing it apart and pulling off epoxy, we realized it was a one time write chip.  So now we're creating a drop-in replacement board.  This board is based on the CC2540 by TI.  It does many cool things including:

  *  SoC Bluetooth
  *  ADC
  *  OpAmp
  *  Flash controller
  *  Lots of I/O
  *  CC2540 Bluetooth low energy system-on-chip
  *  One chip integrated device - controller, host and application on one device
  *  Includes peripherals to interface with analog and digital sensors
  *  In-system reprogrammable flash memory
  *  Accurate RSSI function
  *  Full-speed USB 2.0 interface
  *  Integrated AES-128 encryption engine
  *  40-pin 6x6x0.85mm QFN package

[[http://www.ti.com/ww/en/analog/bluetooth/index.htm?DCMP=BluetoothLowEnergy&HQS=NotApplicable+OT+bluetoothlowenergy||CC2540]] - 5 free samples!

So here is what the button will do:

  *  Drop in replacement for existing board, no hardware modification necessary
  *  Plays back arbitrary audio
  *  LED to indicate status
  *  Multiple tap control
  *  Bluetooth controllable - serial + sound
  *  Possible record via onboard mic 
  *  All I/O broken out to headers for use in other projects

Here are the Eagle Files so far, only the schematics are close to being usable:

[[http://eecue.com/hard_button.zip|Eagle Files]]

[[http://eecue.com/hard_button.jpg|JPG of design]]

  *  60mm circle
  *  1.7mm thick
  *  5.7mm holes x 4
  *  2.4mm screw holes 2 x
  *  14mm dig from screw hole edge to large hole edge
  *  13mm between holes from edge
  *  sw 4.7mm high