My favourite toy. Electrically it's very simple, but the complexity of the mechanical system is quite astonishing.
Other favourite toys: Big Big Train (very rare now), Johnny Astro and Computacar
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https://www.youtube.com/watch?v=tgnbEFuSlXY
All the mechanical work has been done on the ventilation fan. Here I test the fan on a lead-acid gel battery.
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https://www.youtube.com/watch?v=hobhSu5OXOI
Is it acid or is it water - how to tell? Taste it of course. But not before testing it's reactivity with an alkali.
DON'T TRY THIS AT HOME
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https://www.youtube.com/watch?v=WBm_ntI6EU0
Short update on my Arduino Nano, OLED and si7021 humidity and temperature sensor project. Special characters can be placed after the numeric data but at a cost!
See the font data here:
https://github.com/olikraus/u8g2/wiki/fntgrpprofont#profont29_2x3
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https://www.youtube.com/watch?v=STGhHiWpB1g
I built a little adapter board to reposition the OLED on my breadboard. This makes room for the new TTP223 touch switch :)
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https://www.youtube.com/watch?v=3KwMGuIalFc