This great project was sent in by Emil on the blog The Practical Engineer:
In this weeks video I’m making an hourglass lamp with light effects that simulate the falling sand when you turn the lamp upside down.
Another cool feature I build into it is the on / off switch, this is hidden inside the lamp and turns on by putting the lamp on the right side. Turning it upside down then turns off the light.
To simulate the sand that is falling I used some Neopixels from Adafruit powered from an Arduino. I chose these because they are relatively simple to program and you don’t need to work with transistors etc. that would be required when dimming regular leds.
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