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PCB looks just like the 3d rendering ;-) Update Secure Comm

Thanks to KiCAD and PCBWAY things look very nice.
The PCB arrived to my door in 6 days after sending the data to PCBWAY.COM
Time to heat up the soldering iron (vapour phase soldering is my way FYI, not the iron anymore)

Debugging in action, LED blinking, GDB running, Clion as my primary IDE for this project, integrates with CubeMX from ST. New V3 STLINK works great.
The blink was active only 6 days after sending the PCB data to China. How about some fast development!


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Denon DHT T100 DESIGNED TO FAIL : bad caps (ceramic caps this time)

A friend gave me a Denon DHT-T100 to look at.
Do not spend much time on it.. ok.

It had a problem, it started clicking and ticking after power on, and after some time.
(a so called intermittent problem)

Sometimes it did not tick or click, but it was basically not usable.
The clicking had a sharp click in one channel and repeated after about a second, then sound recovered and it would click and drop out again.

He told me, do not spend any time on it, yeah, right. ;-) like I would give up after 15 minutes.
I wanted to know what was going on with this thing, I found some schematic online and started measuring the usual things.

The power supply, 24V did it drop down when a tick occurred ? Difficult to find out because sometimes the thing would play for hours without a glitch.

I eventually found out the 24 V PSU, the step down SMPS on board and the LDO's were all ok, all power rails remained within spec, but it still glitched sometimes. (while power was ok)

I investigated methodically,…

Raspberry Pi, PyFace Digital, the lost documentation, I found it finally

The Raspberry PI or R-pi from is well known these days.
It is not an accident that I have one, I have been doing Linux stuff since 1991, and professionally since 1996 I can not skip over these developments, have to keep up with the new kids. :-)
Times have changed, hardware has become very affordable, everybody knows the Arduino, Raspberry Pi and Beagle-Bone-Black (BBB). Not everybody knows the stuff that aka Acme-Systems and aka Olimex make, so I will endorse them here.
Since I am an engineer I expect to connect switches and relays to the boards and some documentation with products, not so with the "PiFace Digital" board, it comes without serious documentation, not a even the schematic. All links on their blog point nowhere. People asked them many times, yet nowhere is the schematic to be found.

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Nederland van het aardgas af, dat schiet lekker op (NOT!)

Om dingen even in perspectief te plaatsen moet je gewoon even wat berekeningen maken.
We gaan Nederland van het aardgas afhalen (de burgers) omdat?

In USA fakkelen ze 2123763,4944 m3 aardgas af per UUR
(bij winning van olie, gas is ongewenst daar, opslag niet handig, goedkoper om te fakkelen)

1.8 miljard cubic feet per dag...

Ons Nederlandse gasverbruik (huishoudens) is : 1500 m3 per jaar per huishouden

Even rekenen 2.1 miljoen m3 per uur, dat is

24 * 365 * 2.100.000,00 = 18.400.000.000,00 m3 aardgas affakkelen per jaar

(even de rekenmachine pakken)

18.400.000.000 / 1500 => aantal huishoudens Nederland

dat is voor 12.3 miljoen huishoudens (met gasverbruik van 1550 m3/jr)

Naast het opbranden lozen ze ook nog gewoon aardgas direct in de atmosfeer. (genaamd Venting)

Waarom moet ik ook alweer van het aardgas af?

Niet voor het milieu en de toekomst van onze kinderen, daarvoor helpt het helemaal…