03 November 2016

How fast can Arduino toggle a pin?

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I set up this experiment because I wanted to know how fast a standard 16 MHz Arduino board can toggle a pin. Why? Well, say you have a disp...
28 October 2016

Easy socket for ZM1001 (and ZM1000 if necessary)

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At HAM Radio Messe 2016 I bought a board from Philips PM2421 meter. It mounts 4x ZM1000 numeric nixies and 1x ZM1001 symbol nixie (+, -, ~,...
25 October 2016

100 years of DST dates for Europe: 2016-2116

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As described in an earlier post , I want to try implementing automatic DST switch over in my homemade clocks. At least in those that have a ...
20 October 2016

Cheating on DST calculation

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M y homemade clocks currently lack a commodity feature: automatic switch to daylight saving time and back. Throughout Europe this change ...
13 October 2016

Olivetti Logos 262 PD expanson: calcuclock complete!

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There you go! My first desk calculator conversion is complete! I bought an Olivetti Logos 262 PD from 1980's, whose only guilt was to...
28 September 2016

Olivetti Logos 262 PD desk calculator - keyboard must be there

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W hile showing date and time is already an achievement, I wanted to make the display of my converted desk calculator look more dynamic so t...
20 September 2016

Olivetti Logos 262 PD desk calculator - keyboard hookup

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The keyboard of the Logos 262 PD is connected to the main board with a flat cable, all soldered. The way it was built is not convenient for ...
14 September 2016

RTC drift and smartphone reference time

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Once I uploaded the new firmware to my bedside clock, it was easy to figure out if the self-correction routine would work by comparing it wi...