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Added a second example project.

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Chris Palmer
2022-02-09 21:57:56 +00:00
parent 055b4e7102
commit 2a2b7d8bd6
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examples/EnviroPlus/scad/fan_controller.scad Normal file
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//
//! Environmental monitor using Enviro+ sensor board and a Raspberry Pi Zero.
//
// GNU GPL v2
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// Top level model
//
include <NopSCADlib/core.scad>
use <NopSCADlib/vitamins/veroboard.scad>
include <NopSCADlib/vitamins/smds.scad>
fan_vb = vero("fan_vb", "fan_controller", 6, 6, breaks = [[2, 1], [2 + eps, 5]],
components = [
[5, 3, 90, "link", inch(0.4), undef, undef, 2.5],
[0, 5, 0, "link", 0, 4, undef, 2.5],
[0, 1, 0, "link", 0, 4, undef, 2.5],
[0, 0, 0, "link", 0, 4, undef, 2.5],
[2, 5, 0, "-smd_res", RES0805, "3K3"],
[4, 4.7, 90, "-smd_cap", CAP1206, 1.2, "10uF"],
[2, 2.5, 180, "-smd_sot", SOT223, "FZT851"],
],
joints = [[5, 1], [5, 5], [0, [0, 1, 5]]]
);
//! The fan controller is a single transistor wired as a Miller integrator that effectively multiplies the capacitor value by the gain of the transistor.
//! It converts the PWM signal on GPI4 to a stead DC voltage so that the fan doesn't whine, or stutter.
//!
//! ![Schematic](docs/fan_controller.jpg)
//!
//! ***
//! * Make two track cuts as shown, one wide and the other narrow.
//!
//! ![TrackCuts](docs/cuts.jpg)
//!
//! 1. Add the SMT compeonents and then the wire links.
//! 1. Add more solder around the transistor to act as a heatsink.
//!
//! ![SMT](docs/smt.jpg)
//!
module fan_controller_assembly() rotate(90) vflip(!exploded()) veroboard_assembly(fan_vb, -vero_thickness(fan_vb) - 1.4, 0);
fan_controller_assembly();