0.332 is a mod of the SCM SPR332 v2 card reader:
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compact 3D printed case
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less weight
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built-in OpenPGP smart card
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USB-C interface
Materials:
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SCM SPR332 v2 smart card reader (big and heavy)
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double sided tape, e.g. TESA 4965
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thin enameled wire, e.g. ⌀ 2mm = AWG 12
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Mini SIM socket, e.g. the 1981959 by TE Connectivity AMP Connectors (Tyco Electronics)
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SparkFun BOB-15100 USB-C breakout board
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56k resistor
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smart card in mini SIM format
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4 × screws: DIN 912, M2×6 mm
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4 × nuts: DIN 934, M2
Tools:
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soldering equipment
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3D printing equipment
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400 grid paper for wet sanding
Steps:
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Break open the SPR332 v2, and take out:
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PCB
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rubber keypad
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(weight, which makes a nice keyring pendant)
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Desolder and remove components from the PCB:
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buzzer (big black cylinder)
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SIM card socket
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USB cable
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Tape down the mini SIM holder in the correct position.
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Solder six wires to the mini SIM holder:
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Make sure that the wires don’t block the slot.
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Don’t apply too much solder, or else the pins contacting the SIM may loose their elasticity.
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Short the two pins for detecting if a card has been inserted.
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3D print the two shells comprising the enclosure.
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Make everything fit: If needed, trim spacers in the 3D printed enclosure; Wet sand the top layer of the prints.
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Position the SPR332 v2 PCB and the SparkFun USB-C breakout board into the enclosure’s top shell.
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Connect the USB-C breakout board, pulling up CC1 with the resistor connected to VBUS.
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Insert the mini SIM card.
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Assemble the enclosure and tighten the screws.
Except where noted otherwise, files are licensed under the WTFPL.
Copyright © 2019 Felix E. Klee
This work is free. You can redistribute it and/or modify it under the terms of the Do What The Fuck You Want To Public License, Version 2, as published by Sam Hocevar. See the COPYING file for more details.