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BackEverlight ITR1201SR10AR, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler package for Osram SFH9x0x series of boards, https://learn.adafruit.com/adafruit-feather/feather-specification Footprint for the grant of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; right_rib_x = width_mm - 9.5/2 - right_rib_thickness - tolerance; // rib + half a jack col_right = width_mm - thickness*2.5 - tolerance*6; out_row_1 = v_margin+12; out_row_2 = out_working_increment*1 + out_row_1; out_row_4 = out_working_increment*3 + out_row_1; out_row_5 = working_increment*4 + row_1; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff.
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