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Profile for uwezi

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.

Great offer from Elektor.

I’ll have to buy this – or wait a second…

I know the IKEA LED light Jansjö from the add quite well, so I thought until I noticed that this was an USB rip-off from the same series:

IKEA Jansjö spot light: 3 W power, 88 lumen
IKEA Jansjö USB: unknown power(ca 0.5 W?), 10 lumen

We can supply an LED light with probably 0.5 W and 10 lm from the heat of a candle, isn’t it great?

If we stay at IKEA we can buy these candles, 24 with a burning time of 4 hours for €0,99. These together could light our LED light for a full 4×24 hours = 96 hours. Thus we get a total of 96 h x 0.5 W = 48 Wh or 0.048 kWh for €0,99. This corresponds to €20 per kWh, about 100x more expansive than electricity from the wall outlet (in Germany) – ignoring the downpayment on the gadget itself.

Troubel with Telia – again

Sorry, this entry is only available in Svenska.

240×320 TFT with touch on an ATmega328

Breadboard construction.

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 […]

Continue reading 240×320 TFT with touch on an ATmega328

Replacing three remotes

The (almost) final remote control.

You know the problem – with every new gadget comes a new remote control, and while there are programmable and universal remote controls out there, they will never just do what you want.

The three main remotes in my living room.

For controlling my tv, my digital box and one of the wall […]

Continue reading Replacing three remotes

(Deutsch) Ach Ihr schon wieder

"Rechnung" der .DE Deutsche Domain

Sorry, this entry is only available in German.

Fakes from China

s-l500

Inspired by a Youtube video from Bigclive I ordered some Solar Power Rechargeable Flash lights. I knew the risk but I thought it would be a possible way to get hold of some small amorphous silicon solar cell modules for some own projects.

yeah – a bang good solar flash light

Today I […]

Continue reading Fakes from China

…if you get a support answer like this…

Hej [enter customer’s first name, or a combination first & last name.  In the case of a dropshipper please refer to the customer themselves],   [Personalize the template: • Acknowledge customers’ feelings & apologize • Summarize the issue]   [ENTER PERSONAL SIGN OFF, SUCH AS HAVE A NICE DAY, WE HOPE YOU HAVE A […]

Continue reading …if you get a support answer like this…

Hacking an AVR programmer II

USBasp v3.02 from eBay, top side. (photo Sven H)

This is a follow-up of my most popular post, Hacking an AVR programmer.

MX USBasp v3.02

Recently there have been quite a few comments about a new version 3.02 layout of the USBasp programmer available from many Chinese ebay sellers, which appears to be incompatible with my previous hack. The problem is still that […]

Continue reading Hacking an AVR programmer II

Assembling an USBasp

2016_usbasp_uz

…at eight times timelapse it only takes 4 ½ minutes…

http://www.sciencetronics.com/greenphotons/wp-content/uploads/2016/11/20161102_usbasp_480.webm

LaTeX: x11names resorted

xcolor_names_900

I like the color palette which the xcolor package offers under the option x11names, but I find the list of colors in the xcolor manual a bit confusing. The colors are sorted by names and not shades – so today I made my own little table.

[…]

Continue reading LaTeX: x11names resorted