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Arduino Small Form Factor Boards - TinyCircuits ASD2003-R, The TinyCircuits Proto 2 board brings all the TinyShield signals up to solder pads. The signal names are marked on the board and the pads have a 2.54mm (0.1in) spacing, so a standard header can be used if required. This is one of a series of 3 Proto boards, one with 2mm (0.0787in) pitch and one with 2.54mm (0.1in) pitch and an alternate set of signals. See the technical specification for details of which signals are available. This board is included in the TinyDuino Starter Kit (73-4749). TinyCircuits ASD2003-R Miniature Arduino Compatible Proto Board 2 Shield