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Profile for uwezi

Some Toner-Transfer PCB Highlights

Some recent highlights from my home-made circuit boards using the toner-transfer method.

0.5 mm FPC breakout board

Yes, I have been told that I am crazy before… Designed in KiCAD

0.5 mm pitch FPC breakout board – before etching

0.5 mm pitch FPC breakout board – half-way etched

0.5 mm pitch […]

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Canvas: Using Python to create Calculated Questions

Background

I just recently started with Canvas because Uppsala University has decided to use it as its upcoming LMS platform after a failed attempt with another product. Therefore I had already spent some time with Blackboard and was quite fond of the calculated questions type in quizzes. I quickly found out that Canvas offers […]

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A tiny watchdog

In a recent quick-and-dirty project with a Wemos D1 mini clone I had some problems with the reliability of the code. The ESP8266 contains two watchdogs which have the sole purpose to reset the chip if the firmware ever should get stuck. Previously I experienced these watchdogs to be too aggressive, but this was […]

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Hacking IKEA trådfri lighting automation

I recently visited IKEA again and got interested in their affordable line of home automation/LED lighting products called TRÅDFRI (meaing wireless in a play-with-words kind of Swedish). Of course there was already an internet community active in hacking these devices and I joined in.

Getting started

I installed the gateway and after pairing devices […]

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project update: a TTL/CMOS computer

Exactly one month later – our electronics course at Uppsala University just approaches its end – and I got the next shipment for my new project: 1.1 km of equipment wire.

new project: a TTL/CMOS computer

Watching Ben Eater’s youtube series on his breadboard computer based on discrete logic chips inspired me to pursue my own construction. Apart from a lack of time I also needed some more breadboards, which arrived today.

twenty new […]

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A visitor on the balkony

http://www.sciencetronics.com/greenphotons/wp-content/uploads/2018/02/20180226_balkong_malmabacke.mp4

Top deal of the week?

Today I received a newsletter from the publisher Elektor. I am offered a special deal on a Peltier power generator which can power an LED light from a small candle. And this for an astonishing price of €99.95 instead of the normal price of €119.95.

Great offer from Elektor.

I’ll have to buy […]

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Troubel with Telia – again

Sorry, this entry is only available in Svenska.

240×320 TFT with touch on an ATmega328

It’s been a while since I purchased some TFT modules on eBay. These modules come in different sizes and two varieties – with and without integrated touch controller XPT2046. The controller in the TFT display itself is an ILI9341 wired up to be controlled by SPI.

240×320 pixel TFT display with integrated resistive […]

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