Examples
Every HX711 amplifier board in the library, side by side.
It draws each row of the amplifier_boards list, so a row added there appears here too.
Source: examples/amplifier_example.scad
// Every HX711 amplifier board in the library, side by side.
// It draws each row of the amplifier_boards list, so a row added there appears here too.
include <../amplifier_boards.scad>;
spacing = 25;
for (i = [0:len(amplifier_boards) - 1]) translate([0, i * spacing, 0]) amplifier_board(amplifier_boards[i]);
examples/amplifier_example.scad on GitHub
Every load cell in the library, side by side.
It draws each row of the load_cells list, so a row added there appears here too.
Source: examples/load_cells_example.scad
// Every load cell in the library, side by side.
// It draws each row of the load_cells list, so a row added there appears here too.
include <../load_cells.scad>;
spacing = 25;
for (i = [0:len(load_cells) - 1]) translate([0, i * spacing, 0]) load_cell(load_cells[i]);
examples/load_cells_example.scad on GitHub
A single-bar scale: a base and a platform, each bolted to one end of the load cell.
Each has a spacer under its end of the bar, so the middle of the bar, where the gauges are, is free to bend. The screw holes come from the cell’s row, so another cell needs no new numbers.
Source: examples/scale_mount.scad
// A single-bar scale: a base and a platform, each bolted to one end of the load cell.
// Each has a spacer under its end of the bar, so the middle of the bar, where the gauges are,
// is free to bend. The screw holes come from the cell's row, so another cell needs no new numbers.
include <../load_cells.scad>
/* [Scale] */
// Load cell, by its row name
cell = "TAL220"; // [TAL220, TAL220B, TAL221, komputer_10kg, komputer_5kg]
// Length of the base and the platform, along the bar (mm)
plate_length = 100; // [50:5:300]
// Width of the base and the platform (mm)
plate_width = 60; // [20:5:300]
// Thickness of the base and the platform (mm)
plate_thickness = 4; // [2:0.5:10]
// Height of each spacer, the gap the bar bends into (mm)
spacer_height = 5; // [2:0.5:15]
// Clearance on each screw hole's diameter (mm)
hole_clearance = 0.4; // [0:0.1:1]
/* [View] */
// The parts laid out for printing, or put together on the cell
view = "print"; // [print, assembled]
/* [Hidden] */
$fn = 48;
type = [for (t = load_cells) if (lc_name(t) == cell) t][0];
assert(!is_undef(type), str("no load cell named ", cell));
size = lc_cell_dims(type);
gauge = lc_sensor_dims(type);
holes = [for (g = lc_screw_holes(type), p = [g[1], g[2]]) [g[0], p]];
// A spacer runs from the bar's end inward to just past its holes, and stops short of the gauges.
function spacer_from(end) = min([for (h = holes) if (sign(h[1].x) == end) abs(h[1].x) - h[0] / 2]) - 2;
assert(spacer_from(-1) > gauge.x / 2 && spacer_from(1) > gauge.x / 2,
"the spacers would reach the gauges: this cell's holes are too close to its middle");
assert(spacer_height > gauge.z + 1, str("spacer_height must leave the gauges at least 1 mm: more than ", gauge.z + 1));
assert(plate_length >= size.x, str("plate_length must be at least the bar's length, ", size.x));
assert(plate_width >= size.y, str("plate_width must be at least the bar's width, ", size.y));
// One part, drawn plate down from z = 0: the plate, and on it the spacer under the bar's `end`
// (-1 or +1 along x), with clearance holes for that end's screws.
module part(end) {
inner = spacer_from(end);
difference() {
union() {
translate([-plate_length / 2, -plate_width / 2, 0]) cube([plate_length, plate_width, plate_thickness]);
translate([end > 0 ? inner : -size.x / 2, -size.y / 2, plate_thickness])
cube([size.x / 2 - inner, size.y, spacer_height]);
}
for (h = holes) if (sign(h[1].x) == end)
translate([h[1].x, h[1].y, -1]) cylinder(d = h[0] + hole_clearance, h = plate_thickness + spacer_height + 2);
}
}
if (view == "print") {
translate([0, -plate_width / 2 - 5, 0]) part(-1);
translate([0, plate_width / 2 + 5, 0]) part(1);
} else if (view == "assembled") {
load_cell(type);
// The base, under the bar, holding its -x end.
translate([0, 0, -size.z / 2 - spacer_height - plate_thickness]) part(-1);
// The platform, over the bar, holding its +x end.
translate([0, 0, size.z / 2 + spacer_height + plate_thickness]) mirror([0, 0, 1]) part(1);
}
examples/scale_mount.scad on GitHub
The TAL221 from the side: its bores, the slot joining them, and the gauges.
Source: examples/tal221_side.scad
// The TAL221 from the side: its bores, the slot joining them, and the gauges.
include <../load_cells.scad>;
load_cell(LC_TAL221);