Category Archives: Diary

Six sigma blister pack

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When I signed up for distance education a decade or two ago they wouldn’t let me use my normal username ‘jj5’ (from memory at three characters it was too short) so I had to pick something else on the spot while I was signing up and in the heat of the moment I picked ‘sixsigma’, mostly as a bit of a joke.

In statistics sigma is the standard deviation, and six sigma with regard to a normal distribution is six standard deviations from the norm which is very very unlikely. It was just me being cute and not particularly humble but at the same time just tongue in cheek.

Anyway. The thing is that I think very very unlikely events/things are cool. Because when they happen they shake everything up. And today a very very unlikely thing happened to me, which in my whole life has never happened before, and will probably never happen ever again:

Today one of the blisters in the blister pack that my medicine comes in didn’t have a tablet in it!

I mean, wow, right? :)

Empty blister pack

ATmega fuse bytes

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A quick search for arduino fuses programming turned up a bunch of results:

More chromium woes

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Man my chromium browser has been giving me a lot of grief lately. Two times so far I needed to reboot to fix the problem. This is the third time and rebooting is always such a hassle. :(

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Thu Nov 23 20:20:54 [bash:5.2.15 jobs:0 error:0 time:0]
jj5@charisma:/home/jj5
$ chromium 
[1123/202056.945777:ERROR:elf_dynamic_array_reader.h(64)] tag not found
[1123/202056.945823:ERROR:elf_dynamic_array_reader.h(64)] tag not found
Trace/breakpoint trap (core dumped)
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PCBWay: Educational 555 Board

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I got an email from one of the marketing people from PCBWay who said they could offer me free PCB printing services in exchange for a review of their service on my blog. I am very happy to do that!

Today I signed up for an account over here: https://www.pcbway.com/Member/Login/

The signup process was extremely painless: email address, password, terms of service, privacy policy, done.

(Note: I am not a lawyer, but I did read the ToS and privacy policy, and basically they claim the rights to your design files for various purposes and might transfer your data over an insecure network. I think these services are fine for hobbyists dealing with open hardware, but if you’re a commercial entity dealing with higher value intellectual property or larger volumes you might like to get legal advice before engaging.)

After logging in I got an email confirmation code emailed to me. I updated my account settings including my basic information and contact information so they know where to ship my PCBs. In exchange for my having filled out my full profile they gave me US$35 worth of vouchers with various terms (e.g. minimum spend).

I then used their shared project service to search for a 555 timer circuit that would meet my requirements. I found this one: Educational 555 Board.

I clicked “Add to cart” and accepted all the defaults (shown below) on my order for 5 PCBs. So far I am a happy customer! (Update: as part of our sponsorship deal PCBWay covered the shipping costs too! I was a bit worried they might ask me to cover the shipping, but they included it, which was super excellent, especially as the shipping was about five times as much as the boards themselves!)

I’m just getting started with PCB printing. I expect that in future I will do much more of it. I have been working my way through PCB design with KiCad – updated for KiCad 7 to learn how to design PCBs using KiCad. Apparently there is a PCBWay Plug-In for KiCad, so that might be something worth checking out.

When my PCBs from PCBWay arrive I will make a video of me putting together the 555 timer circuit and then using it to test my IC test probes. Stay tuned for that one!

New motherboard: ASUS ProArt B550-CREATOR

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Ordered myself a new motherboard today, the ASUS ProArt B550-CREATOR. This new board will replace my ASUS PRIME B550M-A in my new/upgraded computer ‘lore‘ (which is replacing ‘longing‘).

This new board has 2x M.2 PCIe 4.0 (as with the old motherboard), 2x 2.5Gbps Ethernet (compared to 1x 1Gbps Ethernet in my old motherboard), and 3x PCIe 16x slots (compared to 1x PCIe 16x slot in my old motherboard).

I will put in 2x M.2 PCIe 4x adapters and 2x M.2 PCIe 1x adapters which will mean I am able to install 6x M.2 drives: 2x Kioxia 256GB, 2x Samsung 990 Pro 2TB, and 2x PNY 1TB.

I will also put in a quad 2.5Gbps PCIe Ethernet adapter which will give me six 2.5Gbps Ethernet ports in total (two onboard and four on PCIe 16x).

When I’m done all four RAM slots will be full (4x Corsair Vengeance 32GB 3200MHz DDR4), both the M.2 slots will be full, all three of the PCIe 16x slots will be full, all four SATA ports will be full (3x Western Digital WD Ultrastar DC HC550 16TB and 1x ASUS BW-16D1HT PRO 16X Blu-ray burner), and both PCIe 1x slots will be full too. Also there will be a bunch of high speed USB ports available on both the front and the back of the case. I feel like I have really squeezed a lot of juice out of this system, it’s operating very close to capacity.

I’m kinda dreading plugging in the USB attachments to the front panel, but I guess if I RTFM and apply some thought I will be able to figure that out.