Expand raspi-oled post
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FliegendeWurst
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title = "Raspberry Pi 0 W + sensors + OLED display = temperature monitoring and calendar"
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date = 2022-10-05
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updated = 2023-10-02
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updated = 2023-11-11
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+++
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<img id="hero-img" alt="OLED display showing temperature and upcoming appointments, connected to a Raspberry Pi" src="/assets/raspberry-pi-temperature-monitoring.jpg">
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@ -22,10 +22,10 @@ When activating another display mode (not active in the picture), this area of t
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<li>yellow push switch: TRU Components PBS-18B 701912</li>
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</ul>
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The components are connected to the Pi as indicated in the wiring diagram below.
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The components are connected to the Pi as indicated in the wiring diagram below (made using [Circuit Diagram](https://www.circuit-diagram.org/)).
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<embed
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style="background: white;"
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class="white-svg"
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type="image/svg+xml"
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src="/assets/circuit.svg"
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title="Wiring diagram">
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@ -50,7 +50,7 @@ Wiring of the AM2302 to the RPi:
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Wiring of the push switch to the Pi: one pin to GPIO 19, the other to 3.3V.
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<h3>Software</h3>
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### Software
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The Raspberry Pi 0 W is running <a href="https://www.raspberrypi.com/software/">Raspberry Pi OS</a> 11 (bullseye).
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@ -74,7 +74,7 @@ It is run by another Python script (<a href="https://gist.github.com/FliegendeWu
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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).
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```cron
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```
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*/5 * * * * /home/pi/status_check /home/pi/sensors.db 2>/dev/null >/dev/null
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*/10 * * * * /home/pi/take_measurement /home/pi/sensors.db
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15 * * * * /home/pi/refresh_json --no-weekly
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@ -91,7 +91,7 @@ The binaries (and the libraries they depend on) may be copied to the Pi like thi
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```
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mkdir /tmp/nixstore
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nix copy --extra-experimental-features nix-command --extra-experimental-features flakes --no-check-sigs --to /tmp/nixstore $(readlink -f result)
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nix copy --extra-experimental-features nix-command flakes --no-check-sigs --to /tmp/nixstore $(readlink -f result)
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rsync -r --links --info=progress /tmp/nixstore/nix pi@himbeere-null:~/
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```
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@ -102,4 +102,40 @@ patchelf --set-interpreter /lib/ld-musl-armhf.so.1 nix/store/*-raspi-oled-*/bin/
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sudo mv nix /
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```
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### Enclosure
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<img class="content-img-tall" alt="3D model of the case" src="/assets/raspberry-pi-case.png">
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To make the whole setup look a bit nicer, I designed a casing using [OpenSCAD](https://openscad.org/).
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The image on the right shows the final result as rendered by OpenSCAD ([.scad](/assets/RPi-Zero.scad)).
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[Raspberry Pi 0 W - Slim Case](https://www.thingiverse.com/thing:4199739) (by OhSnap) proved to be a great base to build on.
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I added some supports around it to ensure it won't topple over as easily.
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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).
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Feeling a little bit fancy, I decided to add some inset icons underneath.
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The pin holes will be useful to add some status LEDs later.
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Because one button will soon not be enough control, I added three button holders on the top.
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A library near me offers a 3D printing service so it was easy to get the case printed.
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The new buttons and LEDs will need to be wired up to some unused GPIO pins.
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All LEDs are connected using a single resistor since these will only turn on rarely and even more rarely at the same time.
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<embed
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class="white-svg"
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type="image/svg+xml"
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src="/assets/circuit_new.svg"
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title="Wiring diagram">
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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.
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1. Show time table and large clock
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1. (unused)
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2. Show temperature chart
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3. Show upcoming events
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2. Dismiss active action
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3. Show TOTP codes
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1. Next page
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2. (unused)
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3. Show RPi screensaver
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This post will be updated soon™ to show to the final 3D print (which required some adjustments not yet mentioned).
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227
static/assets/RPi-Zero.scad
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227
static/assets/RPi-Zero.scad
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final = !$preview;
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module pizero() {
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difference() {
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color("green") import("pizero-scase_new.stl");
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if (final) {
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translate([34.4, -25, 1.05]) cube([1,50,.5]);
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translate([34.5, -25, 1.15]) cube([1,50,.5]);
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translate([34.6, -25, 1.25]) cube([1,50,.5]);
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translate([34.7, -25, 1.35]) cube([1,50,.5]);
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translate([34.8, -25, 1.45]) cube([1,50,.5]);
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// keep 4.75 - 5.45 = 0.7
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h = 10.5;
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translate([34.8, -25, 5.45]) cube([1,50,h]);
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translate([34.7, -25, 5.55]) cube([1,50,h]);
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translate([34.6, -25, 5.65]) cube([1,50,h]);
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translate([34.5, -25, 5.75]) cube([1,50,h]);
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translate([34.4, -25, 5.85]) cube([1,50,h]);
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}
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}
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}
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module oled_hole() {
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intersection () {
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translate([0,0,0]) import("OLED_Under_Cabinet.stl");
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cube([48, 10, 40], center=true);
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}
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}
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module led_hole() {
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translate([-1.25, 19, 30]) {
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rotate([90, 0, 0]) cylinder(10, .5, .5, center = true, $fn=32);
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}
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translate([1.25, 19, 30]) {
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rotate([90, 0, 0]) cylinder(10, .5, .5, center = true, $fn=32);
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}
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}
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module extender() {
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difference() {
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s = 90 - 8.5;
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//s = 12.5;
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h = s;
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union() {
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/*
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translate([0, 19, 60]) {
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color("red") rotate([90, 0, 0]) cylinder(10, 1, center = true);
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}
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*/
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translate([0,0,8.5 + s/2]) linear_extrude(s, center=true) projection(cut = true) translate([0,0,-8]) pizero();
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translate([33, -15, 8.5]) cube([1,30,s]);
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for ( i = [ 1 : 6 ] ) {
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w = 19.95;
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color("red")
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translate([33 + i/10, -w/2 + 0.65, 8.5 - i/10]) cube([0.7 - i/10,w,s]);
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}
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difference() {
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union() {
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translate([0,0,8]) cube([34*2,33,2], center=true);
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translate([0,0,9]) cube([34*2,33,1], center=true);
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}
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union () {
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scale([0.99, 0.99, 1]) pizero();
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translate([-33,17.5,8.5]) cube([3.4,3.4,10], center=true);
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translate([-34.9,16,8.5]) cube([3.4,3.4,10], center=true);
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translate([33,17.5,8.5]) cube([3.4,3.4,10], center=true);
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translate([34.9,16,8.5]) cube([3.4,3.4,10], center=true);
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mirror([0,1,0]) {
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translate([-33,17.5,8.5]) cube([3.4,3.4,10], center=true);
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translate([-34.9,16,8.5]) cube([3.4,3.4,10], center=true);
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translate([33,17.5,8.5]) cube([3.4,3.4,10], center=true);
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translate([34.9,16,8.5]) cube([3.4,3.4,10], center=true);
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}
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translate([0,0,8.5]) cube([32*2,14.5*2,10],center=true);
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translate([34,0,8.5]) cube([5,14.5*2,10],center=true);
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}
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}
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}
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translate([34.4, -25, 8.5]) cube([1,50,h]);
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translate([0, 19, 60]) difference() {
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cube([48,10,40], center=true);
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oled_hole();
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}
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led_hole();
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translate([-10,0,0]) {
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led_hole();
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}
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translate([-20,0,0]) {
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led_hole();
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}
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translate([10,0,0]) {
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led_hole();
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}
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translate([20,0,0]) {
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led_hole();
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}
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// cable hole
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translate([35,0,70]) {
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minkowski()
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{
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color("red") cube([5,5,2], center=true);
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rotate([0,90,0]) cylinder(r1=2,r2=2,h=1, center=true, $fn=32);
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}
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}
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// icons
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translate([0, 17.9 - .5, 41]) {
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scale = 0.19;
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translate([-14, 0, 0]) scale([scale, 1, scale]) rotate([90,0,0]) linear_extrude(1) import("./rpi_logo.svg", center=true);
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translate([-5, 0, 0]) scale([scale, 1, scale]) rotate([90,0,0]) linear_extrude(1) import("./Calendar_font_awesome.svg", center=true);
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translate([5, 0, 0]) scale([scale, 1, scale]) rotate([90,0,0]) linear_extrude(1) import("./to cry.svg", center=true);
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translate([14, 0, 0]) scale([scale, 1, scale]) mirror([1,0,0]) rotate([90,0,0]) linear_extrude(1) import("./temp.svg", center=true);
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}
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}
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}
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module button_hole() {
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difference() {
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cube([12.4 + 0.05, 12.4 + 0.05,5], center=true);
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translate([6.05 + 0.05 / 2, -3.81, 0]) cube([0.3,2.6,5], center=true);
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translate([6.05 + 0.05 / 2, 3.81, 0]) cube([0.3,2.6,5], center=true);
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translate([-6.05 - 0.05 / 2, -3.81, 0]) cube([0.3,2.6,5], center=true);
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translate([-6.05 - 0.05 / 2, 3.81, 0]) cube([0.3,2.6,5], center=true);
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}
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}
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module hat() {
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difference() {
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translate([0,0,98.5]) mirror([0,0,1]) difference() {
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union() {
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pizero();
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color("red") translate([33, -13.5, 2.65]) cube([1.4,27,5.85]);
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color("red") translate([-33-1.4, -13.5, 2.65]) cube([1.4,27,5.85]);
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color("red") translate([-30, -18.3+1.4, 2.4]) cube([60,1.4,5.85]);
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translate([-30, -15, 0]) cube([60,30,1.4]);
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translate([0,0,8.5]) difference() {
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cube([66,32,4],center=true);
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cube([63,28,4],center=true);
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}
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}
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translate([34.4, -25, 1.05]) cube([1,50,5]);
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translate([0, 0, 0]) button_hole();
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translate([-20, 0, 0]) button_hole();
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translate([20, 0, 0]) button_hole();
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}
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scale([0.99, 0.99, 1]) extender();
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}
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}
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module sticks1(s=1) {
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for ( i = [0 : 8] ){
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if (i != 6) {
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translate([33.7,0,20+i*8]) cube([s*.75,8,s*.75], center=true);
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}
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translate([-33.7,0,20+i*8]) cube([s*.75,8,s*.75], center=true);
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}
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}
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module sticks2(s=1) {
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translate([0,0,4]) sticks1(s);
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}
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module print1() {
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difference() {
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intersection() {
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extender();
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translate([0,50,0]) cube([1000,100,1000], center=true);
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}
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sticks2(1.05);
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}
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sticks1();
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}
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module print2() {
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difference() {
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intersection() {
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extender();
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mirror([0,1,0]) translate([0,50,0]) cube([1000,100,1000], center=true);
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}
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sticks1(1.05);
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}
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sticks2();
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}
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module print3() {
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hat();
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}
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module pyramid() {
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difference() {
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union() {
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for ( i = [0 : 8]) {
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s = (8 - i) / 2;
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translate([- s, - s, i * 0.5])
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cube([4+s,4+s,.5]);
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x = 2.5;
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}
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}
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x = 2.6;
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translate([4-x,4-x,1])
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cube([x,x,4]);
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}
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}
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module fixer() {
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translate([0, 30, 1]) linear_extrude(2, center=true) circle(5, $fn=32);
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translate([-15, 25, 1]) rotate([0,0,20])scale([1,0.1,1]) linear_extrude(2, center=true) circle(20, $fn=32);
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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);
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translate([0, 50, 1]) linear_extrude(2, center=true) circle(5, $fn=32);
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translate([0, 40, 1]) rotate([0,0,90])scale([.7,0.1,1]) linear_extrude(2, center=true) circle(20, $fn=32);
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}
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module print4() {
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difference() {
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union() {
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pizero();
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translate([-34.4 , -16.9, 0]) pyramid();
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translate([-34.4 , 16.9, 0]) rotate([0, 0, 270]) pyramid();
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translate([34.4 , -16.9, 0]) rotate([0,0,90]) pyramid();
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translate([34.4 , 16.9, 0]) rotate([0, 0, 180]) pyramid();
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fixer();
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mirror([0, 1, 0]) {
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fixer();
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}
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}
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translate([21.5, -17, 4.5]) cube([14, 4, 9], center=true);
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translate([21.5, -25, 4.5]) cube([14,20, 7], center=true);
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}
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}
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//rotate([-90,0,0]) print1();
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//rotate([90,0,0]) print2();
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//mirror([0,0,1]) print3();
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//print4();
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module all() {
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print1();
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print2();
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print3();
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print4();
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}
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all();
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247
static/assets/circuit_new.svg
Normal file
247
static/assets/circuit_new.svg
Normal file
File diff suppressed because one or more lines are too long
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