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2015
I'm working on a 3D controller hat for a Raspberry Pi. This is a glimpse of the hardware prototype. You can see the USB and ethernet ports of the Pi on the left side.     Features:   4 motor control channels   - compatible with A4988 and DRV8825 Stepstick motor drivers   - Motor supply voltage up to 45V   3 High power (15A Max) 12v/24v discrete switch channels to drive fans, heaters, extruders, spindles etc.   6 Digital switch inputs for limit switches. ...
By LDR (9 years old) (+dad) Introduction In this game, you roll coins down a ramp onto a board with foil islands. When the coins make a bridge from one side to the other, it is a complete circuit and an LED lights up.   Simple series circuit with LED. The coins make a conducting ‘bridge’ across the foil ‘islands.’ Version 1 First, I cut out the box and the foil islands. Then I stuck the islands onto the box and two rails along two opposite sides with glue. We ...

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