Tinycircuits small form factor tinycircuits ask1001 r p1 b the tinycircuits tinyduino is an arduino compatible board in an ultra compact package just think of the possibilities of having the power of an arduino uno on a 20mm square board and a stack of 6 boards is less than 25mm 1in high the tinyduino basic kit has the essentials to get you going with the tinyduino system it includes the tinyduino processor board with battery holder 73 4751 the tinyshield usb amp icp board 73 4752