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The die has been cast

Posted on 2011/04/20 by andy

I remember my first digital circuit made up when I was teenager, an electronic dice, made of TTL logical gates, driving 7 LEDs formed to display any combination of dots of thrown dice. I realized it would be good microcontroller playground. Flexibility comming from programming allowed me to plan a bit more comple hardware: double dice display plus sound buzzer. Dice in action (movie) Years of being software engineering have influenced my… Continue reading →

Posted in Electronics, Software | Tagged , , , , , , , , | 2 Comments

GSM antenna freezes microSD

Posted on 2015/07/28 by andy

Dealing with RF is tricky part of electronic design, even though I never had significant issues with GSM in my prototypes. Advancing in WLS project however I discovered a nasty issue with micro SD prone to lock up on interference from GSM built-in antenna, even located in significant distance. To my surprise half of different tested brands suffered from it. Thru extra tests, selection and SD replacement action I was able to greatly improve… Continue reading →

Posted in Electronics | Tagged | 2 Comments

webworker-blob-malformed-url

Posted on 2018/10/18 by andy

Malformed Blob URL in IE Continue reading →

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Not valid Ubuntu CD-ROM

Posted on 2012/08/07 by andy

Not valid Ubuntu CD-ROM Continue reading →

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Mini-ITX home server – part two, software

Posted on 2012/08/07 by andy

In the late stage of hardware planning of new server I assumed software RAID1 support. Since this was my first time to play with disk array I reduced number of variables to minimum and have chosen Ubuntu Linux as server OS, distribution I know best. Overcoming installer defects I laid down the foundations, configured remote graphical access, migrated services, measured and estimated TCO of platform. Preparing for installation I discovered… Continue reading →

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Tiny home server

Posted on 2011/03/15 by andy

Can you imagine that blog you read is running on tiny router box, size of average book, consuming only 8 watt of energy per hour? Next to advanced network management tasks, the same box is NAS, source code reporitory storage, MySQL database server, printer server, download manager and many others? At the same time it does not get hot and does not make any sound? Pretty interesting, isn’t it? How did I manage to make this happen? Couple… Continue reading →

Posted in OpenWRT | 3 Comments

Water Level Logger – solar charger

Posted on 2014/02/17 by andy

It was my first work on photo-voltaic and rechargeable batteries technology. I have read a lot about mono- and poly-crystalline cells, tracking the highest efficiency points of panels (MPPT) or proper charging/discharging. Facing that I felt I have long way to go. Until I read article on Linear’s LT3652 all-in-one chip. LT3652 tiny case with underneath pad Even though it was quite expensive to figure out it if fits my needs at all, I have… Continue reading →

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USB power supply mod and 3G for TL-WR1043ND

Posted on 2011/12/26 by andy

Using multiple power-consuming devices in USB hub modded router will exceed limited power of built-in 5V rail of TL-WR1043ND router. In my case connecting both 3G modem and external HDD to led to power drops and root filesystem disconnections. Keeping router self-sufficient I managed to built additional 5V power regulator into the tiny case of router, making mobile internet as backup line for home network. 3G modem and extra switching power… Continue reading →

Posted in Electronics, OpenWRT | 3 Comments

Heavy current drain load test

Posted on 2011/12/23 by andy

Heavy current drain load test Continue reading →

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USB hub current drain test

Posted on 2011/12/23 by andy

USB hub current drain test Continue reading →

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