Expand raspi-oled post

content/blog/raspberry-pi-temperature-monitoring.md

@@ -1,7 +1,7 @@
 +++
 title = "Raspberry Pi 0 W + sensors + OLED display = temperature monitoring and calendar"
 date = 2022-10-05
-updated = 2023-10-02
+updated = 2023-11-11
 +++
 
 <img id="hero-img" alt="OLED display showing temperature and upcoming appointments, connected to a Raspberry Pi" src="/assets/raspberry-pi-temperature-monitoring.jpg">
@@ -22,10 +22,10 @@ When activating another display mode (not active in the picture), this area of t
 	<li>yellow push switch: TRU Components PBS-18B 701912</li>
 </ul>
 
-The components are connected to the Pi as indicated in the wiring diagram below.
+The components are connected to the Pi as indicated in the wiring diagram below (made using [Circuit Diagram](https://www.circuit-diagram.org/)).
 
 <embed
-    style="background: white;"
+  class="white-svg"
   type="image/svg+xml"
   src="/assets/circuit.svg"
   title="Wiring diagram">
@@ -50,7 +50,7 @@ Wiring of the AM2302 to the RPi:
 Wiring of the push switch to the Pi: one pin to GPIO 19, the other to 3.3V.
 
 
-<h3>Software</h3>
+### Software
 
 
 The Raspberry Pi 0 W is running <a href="https://www.raspberrypi.com/software/">Raspberry Pi OS</a> 11 (bullseye).
@@ -74,7 +74,7 @@ It is run by another Python script (<a href="https://gist.github.com/FliegendeWu
 
 Below is the crontab of the pi user. status_check is run every five minutes. take_measurement is run every ten minutes. Fifteen minutes into the hour, any new calendar entries are synced using refresh_json. To avoid OLED burn-in, the display is turned off every minute (if it was on previously).
 
-```cron
+```
 */5 * * * * /home/pi/status_check /home/pi/sensors.db 2>/dev/null >/dev/null
 */10 * * * * /home/pi/take_measurement /home/pi/sensors.db
 15 * * * * /home/pi/refresh_json --no-weekly
@@ -91,7 +91,7 @@ The binaries (and the libraries they depend on) may be copied to the Pi like thi
 
 ```
 mkdir /tmp/nixstore
-nix copy --extra-experimental-features nix-command --extra-experimental-features flakes --no-check-sigs --to /tmp/nixstore $(readlink -f result)
+nix copy --extra-experimental-features nix-command flakes --no-check-sigs --to /tmp/nixstore $(readlink -f result)
 rsync -r --links --info=progress /tmp/nixstore/nix pi@himbeere-null:~/
 ```
 
@@ -102,4 +102,40 @@ patchelf --set-interpreter /lib/ld-musl-armhf.so.1 nix/store/*-raspi-oled-*/bin/
 sudo mv nix /
 ```
 
+### Enclosure
 
+<img class="content-img-tall" alt="3D model of the case" src="/assets/raspberry-pi-case.png">
+
+To make the whole setup look a bit nicer, I designed a casing using [OpenSCAD](https://openscad.org/).
+The image on the right shows the final result as rendered by OpenSCAD ([.scad](/assets/RPi-Zero.scad)).
+
+[Raspberry Pi 0 W - Slim Case](https://www.thingiverse.com/thing:4199739) (by OhSnap) proved to be a great base to build on.
+I added some supports around it to ensure it won't topple over as easily.
+Since I was too lazy to measure the dimensions of my OLED display, I extracted the relevant part of [Zoid, the Trapezoidal Under Cabinet 1.5" OLED Display](https://www.thingiverse.com/thing:3397089) (by rhattie).
+Feeling a little bit fancy, I decided to add some inset icons underneath.
+The pin holes will be useful to add some status LEDs later.
+Because one button will soon not be enough control, I added three button holders on the top.
+A library near me offers a 3D printing service so it was easy to get the case printed.
+
+The new buttons and LEDs will need to be wired up to some unused GPIO pins.
+All LEDs are connected using a single resistor since these will only turn on rarely and even more rarely at the same time.
+
+<embed
+  class="white-svg"
+  type="image/svg+xml"
+  src="/assets/circuit_new.svg"
+  title="Wiring diagram">
+
+To make full use of the three buttons, I came up with a simple one/two-step selection menu to get to the most important functionality.
+
+1. Show time table and large clock
+    1. (unused)
+    2. Show temperature chart
+    3. Show upcoming events
+2. Dismiss active action
+3. Show TOTP codes
+    1. Next page
+    2. (unused)
+    3. Show RPi screensaver
+
+This post will be updated soon™ to show to the final 3D print (which required some adjustments not yet mentioned).

static/assets/RPi-Zero.scad

@@ -0,0 +1,227 @@
+final = !$preview;
+module pizero() {
+difference() {
+color("green") import("pizero-scase_new.stl");
+if (final) {
+    translate([34.4, -25, 1.05]) cube([1,50,.5]);
+    translate([34.5, -25, 1.15]) cube([1,50,.5]);
+    translate([34.6, -25, 1.25]) cube([1,50,.5]);
+    translate([34.7, -25, 1.35]) cube([1,50,.5]);
+    translate([34.8, -25, 1.45]) cube([1,50,.5]);
+    // keep 4.75 - 5.45 = 0.7
+    h = 10.5;
+    translate([34.8, -25, 5.45]) cube([1,50,h]);
+    translate([34.7, -25, 5.55]) cube([1,50,h]);
+    translate([34.6, -25, 5.65]) cube([1,50,h]);
+    translate([34.5, -25, 5.75]) cube([1,50,h]);
+    translate([34.4, -25, 5.85]) cube([1,50,h]);
+}
+}
+}
+module oled_hole() {
+intersection () {
+    translate([0,0,0]) import("OLED_Under_Cabinet.stl");
+    cube([48, 10, 40], center=true);
+}
+}
+module led_hole() {
+    translate([-1.25, 19, 30]) {
+        rotate([90, 0, 0]) cylinder(10, .5, .5, center = true, $fn=32);
+    }
+    translate([1.25, 19, 30]) {
+        rotate([90, 0, 0]) cylinder(10, .5, .5, center = true, $fn=32);
+    }
+}
+module extender() {
+    difference() {
+    s = 90 - 8.5;
+    //s = 12.5;
+    h = s;
+    union() {
+        /*
+        translate([0, 19, 60]) {
+        color("red") rotate([90, 0, 0]) cylinder(10, 1, center = true);
+    }
+        */
+        translate([0,0,8.5 + s/2]) linear_extrude(s, center=true) projection(cut = true) translate([0,0,-8]) pizero();
+        translate([33, -15, 8.5]) cube([1,30,s]);
+        for ( i = [ 1 : 6 ] ) {
+            w = 19.95;
+            color("red")
+            translate([33 + i/10, -w/2 + 0.65, 8.5 - i/10]) cube([0.7 - i/10,w,s]);
+        }
+        difference() {
+        union() {
+            translate([0,0,8]) cube([34*2,33,2], center=true);
+            translate([0,0,9]) cube([34*2,33,1], center=true);
+            }
+            union () {
+                scale([0.99, 0.99, 1]) pizero();
+                translate([-33,17.5,8.5]) cube([3.4,3.4,10], center=true);
+                translate([-34.9,16,8.5]) cube([3.4,3.4,10], center=true);
+                translate([33,17.5,8.5]) cube([3.4,3.4,10], center=true);
+                translate([34.9,16,8.5]) cube([3.4,3.4,10], center=true);
+                mirror([0,1,0]) {
+                translate([-33,17.5,8.5]) cube([3.4,3.4,10], center=true);
+                translate([-34.9,16,8.5]) cube([3.4,3.4,10], center=true);
+                translate([33,17.5,8.5]) cube([3.4,3.4,10], center=true);
+                translate([34.9,16,8.5]) cube([3.4,3.4,10], center=true);
+                
+                }
+                translate([0,0,8.5]) cube([32*2,14.5*2,10],center=true);
+                translate([34,0,8.5]) cube([5,14.5*2,10],center=true);
+            }
+            }
+    }
+    translate([34.4, -25, 8.5]) cube([1,50,h]);
+    translate([0, 19, 60]) difference() {
+        cube([48,10,40], center=true);
+        oled_hole();
+    }
+    led_hole();
+    translate([-10,0,0]) {
+        led_hole();
+    }
+    translate([-20,0,0]) {
+        led_hole();
+    }
+    translate([10,0,0]) {
+        led_hole();
+    }
+    translate([20,0,0]) {
+        led_hole();
+    }
+    // cable hole
+    translate([35,0,70]) {
+        minkowski()
+{
+  color("red") cube([5,5,2], center=true);
+  rotate([0,90,0]) cylinder(r1=2,r2=2,h=1, center=true, $fn=32);
+}
+    }
+    // icons
+    translate([0, 17.9 - .5, 41]) {
+        scale = 0.19;
+    translate([-14, 0, 0]) scale([scale, 1, scale]) rotate([90,0,0]) linear_extrude(1) import("./rpi_logo.svg", center=true);
+    translate([-5, 0, 0]) scale([scale, 1, scale]) rotate([90,0,0]) linear_extrude(1) import("./Calendar_font_awesome.svg", center=true);
+        translate([5, 0, 0]) scale([scale, 1, scale]) rotate([90,0,0]) linear_extrude(1) import("./to cry.svg", center=true);
+        translate([14, 0, 0]) scale([scale, 1, scale]) mirror([1,0,0]) rotate([90,0,0]) linear_extrude(1) import("./temp.svg", center=true);
+    }
+}
+}
+module button_hole() {
+    difference() {
+        cube([12.4 + 0.05, 12.4 + 0.05,5], center=true);
+        translate([6.05 + 0.05 / 2, -3.81, 0]) cube([0.3,2.6,5], center=true);
+        translate([6.05 + 0.05 / 2, 3.81, 0]) cube([0.3,2.6,5], center=true);
+        translate([-6.05 - 0.05 / 2, -3.81, 0]) cube([0.3,2.6,5], center=true);
+        translate([-6.05 - 0.05 / 2, 3.81, 0]) cube([0.3,2.6,5], center=true);
+    }
+}
+module hat() {
+    difference() {
+    translate([0,0,98.5]) mirror([0,0,1]) difference() {
+        union() {
+            pizero();
+            color("red") translate([33, -13.5, 2.65]) cube([1.4,27,5.85]);
+            color("red") translate([-33-1.4, -13.5, 2.65]) cube([1.4,27,5.85]);
+            color("red") translate([-30, -18.3+1.4, 2.4]) cube([60,1.4,5.85]);
+            translate([-30, -15, 0]) cube([60,30,1.4]);
+            translate([0,0,8.5]) difference() {
+                cube([66,32,4],center=true);
+                cube([63,28,4],center=true);
+            }
+        }
+        translate([34.4, -25, 1.05]) cube([1,50,5]);
+        translate([0, 0, 0]) button_hole();
+        translate([-20, 0, 0]) button_hole();
+        translate([20, 0, 0]) button_hole();
+    }
+    scale([0.99, 0.99, 1]) extender();
+}
+}
+module sticks1(s=1) {
+    for ( i = [0 : 8] ){
+        if (i != 6) {
+                translate([33.7,0,20+i*8]) cube([s*.75,8,s*.75], center=true);
+            }
+            translate([-33.7,0,20+i*8]) cube([s*.75,8,s*.75], center=true);
+        }
+    }
+    module sticks2(s=1) {
+    translate([0,0,4]) sticks1(s);
+    }
+module print1() {
+    difference() {
+    intersection() {
+        extender();
+        translate([0,50,0]) cube([1000,100,1000], center=true);
+    }
+    sticks2(1.05);
+}
+    sticks1();
+}
+module print2() {
+    difference() {
+    intersection() {
+        extender();
+        mirror([0,1,0]) translate([0,50,0]) cube([1000,100,1000], center=true);
+    }
+    sticks1(1.05);
+}
+    sticks2();
+}
+module print3() {
+    hat();
+}
+module pyramid() {
+difference() {
+union() {
+    for ( i = [0 : 8]) {
+        s = (8 - i) / 2;
+        translate([- s, - s, i * 0.5])
+        cube([4+s,4+s,.5]);
+        x = 2.5;
+    }
+    }
+    x = 2.6;
+        translate([4-x,4-x,1])
+        cube([x,x,4]);
+    }
+}
+module fixer() {
+translate([0, 30, 1]) linear_extrude(2, center=true) circle(5, $fn=32);
+    translate([-15, 25, 1]) rotate([0,0,20])scale([1,0.1,1]) linear_extrude(2, center=true) circle(20, $fn=32);
+    mirror([1,0,0]) translate([-15, 25, 1]) rotate([0,0,20])scale([1,0.1,1]) linear_extrude(2, center=true) circle(20, $fn=32);
+    
+    translate([0, 50, 1]) linear_extrude(2, center=true) circle(5, $fn=32);
+    translate([0, 40, 1]) rotate([0,0,90])scale([.7,0.1,1]) linear_extrude(2, center=true) circle(20, $fn=32);
+    }
+module print4() {
+difference() {
+union() {
+    pizero();
+    translate([-34.4 , -16.9, 0]) pyramid();
+    translate([-34.4 , 16.9, 0]) rotate([0, 0, 270]) pyramid();
+    translate([34.4 , -16.9, 0]) rotate([0,0,90]) pyramid();
+    translate([34.4 , 16.9, 0]) rotate([0, 0, 180]) pyramid();
+    fixer();
+    mirror([0, 1, 0]) {
+    fixer();
+    }
+    }
+    translate([21.5, -17, 4.5]) cube([14, 4, 9], center=true);
+    translate([21.5, -25, 4.5]) cube([14,20, 7], center=true);
+    }
+}
+//rotate([-90,0,0]) print1();
+//rotate([90,0,0]) print2();
+//mirror([0,0,1]) print3();
+//print4();
+module all() {
+    print1();
+    print2();
+    print3();
+    print4();
+}
+all();