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feat(case): add a reset button hole in the back wall

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Momentary switch wired to the board's EN/GND, mounted past the µSD so
it's never hit while typing. BOOT is omitted on purpose: on the S3,
auto-download makes it recovery-only. Positions are << MEASURE >>
placeholders — a custom carrier PCB will re-fix them later.
This commit is contained in:
Julien Calixte
2026-07-11 10:01:21 +02:00
parent 3faff25fba
commit 195311a395
8 changed files with 32 additions and 2 deletions
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20
hardware/case/typoena-case.scad
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@@ -86,6 +86,18 @@ sd_w = 12; sd_h = 2.4; // microSD slot
// X positions of the three openings along the back << MEASURE to your board >>
port_x = [W/2 - 15, W/2, W/2 + 17]; // usb-c (kbd), usb-c (power), µSD
// ---- reset button (momentary wired to EN/GND) -----------------------------
// Our OWN switch, soldered to the board's EN + GND header pins — NOT the
// DevKitC's on-board buttons (top-actuated and buried once the board lies flat
// on its standoffs). It sits on the back wall, out past the µSD, so it's never
// hit while typing. BOOT is left off on purpose: on the S3, auto-download
// (UART-bridge DTR/RTS or the native USB-Serial-JTAG) makes it recovery-only —
// not worth a fat-fingerable button on a writing appliance.
rst_btn = true; // set false to omit the reset hole entirely
rst_d = 7.2; // through-hole Ø for the switch barrel << MEASURE >>
rst_x = W/2 + 40; // X along the back wall (past the µSD @ +17) << MEASURE >>
rst_z = 12; // centre height off the desk << MEASURE >>
// ---- baseplate / chassis --------------------------------------------------
bp_t = 2.6; // baseplate thickness
bp_gap = 0.5; // clearance so it drops into the shell
@@ -202,6 +214,13 @@ module port_cuts() {
}
}
// reset switch mounting hole through the back wall (y = D)
module reset_cut() {
if (rst_btn)
translate([rst_x, D-wall-1, rst_z])
rotate([-90,0,0]) cylinder(h=wall+2, r=rst_d/2);
}
// engraved nameplate on the DECK, in the band between the front edge and the
// screen — faces the user as they write. Sits flat on the reclined deck.
module nameplate() {
@@ -221,6 +240,7 @@ module case_body() {
}
screen_cuts();
port_cuts();
reset_cut();
nameplate(); // engrave (comment out for a blank face)
}
}