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Plesk: Enable SFTP access for additional FTP users
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Plesk: Enable SFTP access for additional FTP users

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By default only the main user of a domain can SFTP into a domain. Plesk does allow to add FTP users but for some reason not for access over encrypted SSH. That makes the whole feature broken given today’s security standards that don’t allow plain FTP access anymore. This guide helps you to properly set up the new user for secure access over SFTP.

Cannot allocate memory – Fix for login error
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Cannot allocate memory – Fix for login error

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Do you see this message on every login to your Ubuntu system? “Could not load list of meta packages: [Errno 12] Cannot allocate memory”. The error indicates there was not enough RAM available to complete the task. Here I explain where the message comes from and how to get rid of it.

Blocking vs non-blocking timers in Arduino and Particle
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Blocking vs non-blocking timers in Arduino and Particle

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When coding for Arduino you may wish to run certain code once every N milliseconds. For a very simple program like blinking a LED with a 2 seconds interval using the delay() function will be sufficient. But what about multiple bits of code where each require a different interval? Using delay() they will slow each other down, significantly disrupting your program. The solution is the meassure the last time the code parts were executed.