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A bit revised README.md to rev 2 Battery clip for batteries with a hair of margin $fn=FN; /* [Panel] */ width = 40; // [1:1:84] //Second row interface placement f_tune = [second_col, fourth_row, 0]; triangle_out = [output_column, row_2, 0]; audio_in_2 = [left_col, row_1, 0]; triangle_out = [output_column, row_1, 0]; audio_out_2 = [right_col, row_3, 0]; c_tune = [width_mm/2 - h_margin, top_row, 0]; left_rib_x = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth; right_edge = height - rail_clearance - thickness*2 - 16.5/2; // 16.5 is the decade counter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many people have at least three years, to give any other entity based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, https://www.micron.com/-/media/client/global/documents/products/data-sheet/dram/ddr3/4gb_ddr3l.pdf#page=25 FBGA-78, 10.5x9.0mm, 78 Ball, 9x13 Layout, 0.8mm Pitch, https://www.ti.com/lit/ml/mpbg777/mpbg777.pdf BGA 289 0.8 ZAV S-PBGA-N289 Texas Instruments, DSBGA, area grid, YBG pad definition, https://www.ti.com/lit/ds/symlink/lmg1020.pdf, https://www.ti.com/lit/ml/mxbg078z/mxbg078z.pdf BGA 6 0.4 YFF0006 Texas Instruments, DSBGA, 1.36x1.86mm, 12 bump 3x4 (area) array, NSMD pad definition Appendix A BGA 1156 1 RF1157 RF1158 Virtex-7 BGA, 42x42 grid, 42.5x42.5mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=280, NSMD pad definition Appendix A BGA 324 0.8 CS325 CSG235 Spartan-7 BGA, 14x14 grid, 15x15mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=80, NSMD pad definition Appendix A Virtex-7 BGA, 34x34 grid, 35x35mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=303, NSMD pad definition Appendix A Kintex-7 BGA, 26x26 grid, 27x27mm package, 1mm.

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