What did you build today (Pictures) ?

[GertSanders]

@neverdie that is a nice pattern. I found that these things need time to draw. If anyone has a DXF file, I would love to try it.

[mickecarlsson]

@sundberg84 thanks for the offer, I can wait for the final, no worries. Do you have a list of the new components added on the back?

[NeverDie]

@dbemowsk said in What did you build today (Pictures) ?:

@neverdie That's cool. Kind of like an overlapping honeycomb design.

Bingo! Looks like that's exactly what it is. A small honeycomb superimposed on a bigger one.

[dbemowsk]

@neverdie I created that basic pattern in OpenSCAD.

Here is the scad

 $fn = 6;
 fudge = 0.01;
 
 pi=3.1415926;
 large_diameter = 40;
 circumradius = large_diameter/2;
 inradius = circumradius/(2*tan(180/$fn))-1;
 
 height = 2;
 line_width = 1;

 rotate([0, 0, 0]) hollow_cylinder(large_diameter-line_width, height, line_width);
 
 for(i=[1:$fn]) {
     rotate([0, 0, (360/$fn*i)+30]) translate([inradius, 0, 0]) rotate([0, 0, 30]) hollow_cylinder(circumradius, height, line_width);
 }
 
 
 module hollow_cylinder(diameter=10, thickness=2, line_thickness=2) {
     difference() {
         cylinder(thickness, d=diameter);
         translate([0, 0, -fudge/2]) cylinder(thickness+fudge, d=diameter-(line_thickness*2));
     }
 }

[dbemowsk]

Expanding on that, I mapped it out further to give people an idea of how it's calculated.

And the scad based on my previous post.

 $fn = 6;
 fudge = 0.01;
 
 pi=3.1415926;
 large_diameter = 40;
 circumradius = large_diameter/2;
 inradius = circumradius/(2*tan(180/$fn))-1;
 
 height = 2;
 line_width = 1;
 
 for(i=[1:$fn]) {
    rotate([0, 0, (360/$fn*i)+30]) translate([inradius*2, 0, 0]) rotate([0, 0, 30]) honeycomb();
 }

 module honeycomb() {
     rotate([0, 0, 0]) hollow_cylinder(large_diameter-line_width, height, line_width);
     
     for(i=[1:$fn]) {
         rotate([0, 0, (360/$fn*i)+30]) translate([inradius, 0, 0]) rotate([0, 0, 30]) hollow_cylinder(circumradius, height, line_width);
     }
 }
 
 
 module hollow_cylinder(diameter=10, thickness=2, line_thickness=2) {
     difference() {
         cylinder(thickness, d=diameter);
         translate([0, 0, -fudge/2]) cylinder(thickness+fudge, d=diameter-(line_thickness*2));
     }
 }

[sundberg84]

@mickecarlsson - sure.
Signing: atsha204a (sot-32-3), R4: 1k-100k resistor (0805), C5 0,1uF capacitor (0805)
Flash: R7: 56k-100k resistor (0805), C7; 0,1uF capacitor (0805), U5: AT25DF512C or equivalent SPI Serial Flash Memory (8-lead SOIC). I bought this from Germany (but not tested)

[sundberg84]

Yesterday I tested the new EasyPCB with RFM radio and hardware signing. Worked out as expected and I'm going to release all files soon.

I haven't tested the flash part yet but I'm hoping this is working as well.

This picture will be a part of a new video with me building my new RFM69 serial gateway using signing.

Anyone they can guess which issue I had when I took the photo?

Rev9 vs Rev10 (inkl signing) rfm gw

[mickecarlsson]

@sundberg84 the RFM69 is soldered 180 degrees wrong on the new board :white_frowning_face:

[sundberg84]

@mickecarlsson interesting thought but no because the radio on rev9 isn't soldered in the image (but wrong rotated as you noticed). The hardware on that image is working. I added a HW radio without noticing so with the old code I just got no reply/Nack. I had to add the HW define.

[vladimir]

Today I finally finished my second RGB LED lighting in the room. Next is the LED illumination of the perimeter of the bed. Under the bed, I want to place a motion sensor so that it reacts when I get out of bed at night.

[sundberg84]

Redesigning my nodes in the RFM69 network to be signed using EasyPCB 10. Today it was my beer cooler node (because it's very important the beer temperature is secured). In the same time I'm implementing @gohan idea with two temp points (top and bottom).

[GertSanders]

@vladimir

you could use this under the bed:

https://www.aliexpress.com/item/Free-Shipping-5-Pieces-RCWL-0516-Microwave-Radar-Sensor-Module-Human-Body-Induction-Switch-Module/32773310756.html?spm=a2g0s.9042311.0.0.27424c4dQaNm0K

It works like an infrared sensor (same three pins), but it does not need a line of sight. It just reacts to movement as this results in a disturbance in the emitted radio signal. Works very well on my clock :-)

The "high" value when movement is detected is not a full 5V, so I test the Out pin as an analog pin. Anything above 2.5V is an activation due to movement.

[vladimir]

@gertsanders many thanks!:raised_hands: This is very interesting, I did not previously hear about such a sensor.
I understand correctly that it can be placed in a wooden case and it can work through it? Since the tree does not reflect its waves.
If this is so, will not it respond to the movement of the bed frame or my movements when I'm on the bed?...:thinking_face:

[gohan]

I tried some of those radar sensors and are very sensitive, they could detect even if you move in the bed. In addition I'd rather not sleep next to a 5 Ghz radar emitter 😅

[vladimir]

@gohan Is there a chance to wake up a little toasted?:sweat_smile:

[gohan]

fortunately the power is low, but still in the wifi power range and it is transmitting 24/7

[NeverDie]

@gohan Oh, pish posh. It's made in China and sold for peanuts! What could possibly go wrong?

[gohan]

I think it would be faster to answer to "what could possibly not go wrong"

[NeverDie]

@gohan What could possibly not go wrong? :volcano:

[wallyllama]

So these radar motion sensors are actually quite impressive, the ones with just analog output only have 1 transistor, the rest of the circuit is formed by the pcb traces. Weird, but it works. They can be hacked (sawtooth wave for power) to give a distance reading instead of doppler. The signal processing is too much for an arduino, but it is doable.

The other ones actually use the same chip as the most common pir devices.