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…
IKEA TRÅDFRI Zigbee module on a breadboard.
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…
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.
twenty new breadboards
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.
Unschlagbares Angebot der Firma Elektor.
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.
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.
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Breadboard construction.
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…
The (almost) final remote control.
Replacing three remotes
Idea 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…
