Category IT

WD Blue SSD 2T performance on Lenovo T460

After about 7 years, and 29105 Power_On_Hours, I decided to upgrade my ageing Samsung 840 Pro 127Gb hard disk. One of the reasons to switch brands to WD was that another Samsung hard disk that I have, the Samsung 860… Continue Reading →

gdb: changing the code of a running program

Introduction I am using a Raspberry Pi 3 Model B+ as my media center. Libreelec, Kodi and HDMI-CEC (using the remote of the TV to navigate through the content) are very nice, and I’m even planning to buy a DVD-T… Continue Reading →

OCR for Aqua Medic mV Controller 2001 C

The Aqua Medic mV Controller 2001C which provides no serial/USB connection to obtain the current measurements or the On/Off state of the pump. Why the need for OCR ? To help reducing the nitrates in my reef, I’m using an… Continue Reading →

KVM / qemu – high CPU load but low CPU usage

Been struggling for a while with high CPU load (0.40) but CPU usage was at best 10%. Setup Machine is an Intel Xeon E3-1240 v3, Fedora 26, running on a mdadm RAID 5 array. Including few virtual machines which at… Continue Reading →

fortune-mod cross-compiling for Android / ARM aarch64

This is mostly a log of the attempts to get fortune-mod to run on my Samsung S7 running LineageOS 14.1. After few hurdles, everything got built. Recode problems Trying to get recode to build (required by fortune-mod) I ended up… Continue Reading →

Feather HUZZAH ESP8266 – Realistic Power Consumption

The Adafruit Huzzah esp8266 is too power hungry to be used by itself on battery (batteries). This blog is a summary of my attempts to get it to run as long as possible in a real world scenario: periodically send… Continue Reading →

picoFarad Meter using Arduino Leonardo

As part of a soil humidity monitoring system, I needed to test how much the water (used as a dielectric) can influence the capacitance between two metal plates inserted into the ground. The capacitance is very small, in the pF… Continue Reading →

3D DIY Camera Rig (based on Sony DSC-W800)

As an alternative for my LG p720 3D phone, I decided to build a 3D camera rig using two Sony DSC-W800 cameras. Given that 3D cameras fell out of grace years ago, I wanted to test if I could build… Continue Reading →

attiny85 DIY Programmer

I needed to program few attiny85 chips and decided to use the Arduino Leonardo or Arduino Micro as serial programmers. So I came up with a mini shield that I could mount on either of the two and uses the… Continue Reading →

Arduino Micro as ISP (flashing the bootloader of an Arduino Leonardo)

Arduino Leonardo refused to accept a new sketch once a very large one was uploaded (code / memory). The board would hang just after the upload started (and power cycling it did not fix the problem). Since I found no… Continue Reading →

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