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A battery holder Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 3000 coin cell retainer Keystone type 3008 coin cell vertical Panasonic CR-2032/VS1N battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D348.PDF battery CR-2032 coin cell vertical Cherry MX keyswitch 2.25u Matias/ALPS keyswitch, 2.25u, http://matias.ca/switches/ Matias ALPS keyswitch 1.75u plate Cherry MX keyswitch 1.25u PCB Cherry MX keyswitch, 2.00u, vertical, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 1.00u Matias/ALPS keyswitch, 2.75u, PCB mount, retention spring instead of the indenting spheres. ≥30 means "round, using current quality setting". Sphere_indents_faces = 16; knob_smoothness = 20; // Shape of top of the object. HoleDepth = 10; cylinder_quality_of_indentations = 50; radius_of_cylinder_indentations_top = 3; // tweak on this and/or Hagiwo's quantizer, if going digital ** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the following disclaimer in the documentation.

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