We picked up a magnetic foam shape kit, to make a fridge-mounted marble run. But picking up the marble after each run is such a drag - wouldn't it be fun if you could use your Crickit to help lift the ball back up and re-start the marble run?

With an electromagnet, we can pick up the stainless steel balls. A DC motor acts as a pulley, and a servo helps align the electromagnet so it can navigate around the foam.

You can DIY, as we did, using the two Circuit Playground Express buttons and switch to control the motors - or you could even automate the whole thing!

Parts List

A Black woman's manicured hand holds a round microcontroller with lit up LEDs.
Circuit Playground Express is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and...
$24.95
In Stock
Top down view of a Adafruit CRICKIT for Circuit Playground Express with a circular board connected.
Sometimes we wonder if robotics engineers ever watch movies. If they did, they'd know that making robots into servants always ends up in a robot rebellion. Why even go down that...
Out of Stock
DC Gearbox Motor - TT Motor with two long wires and yellow body
Perhaps you've been assembling a new robot friend, adding a computer for a brain and other fun personality touches. Now the time has come to let it leave the nest and fly on...
$2.95
In Stock
Standard hobby servo with three pin cable
This high-torque standard servo can rotate approximately 180 degrees (90 in each direction). You can use any servo code, hardware, or library to control these servos. Good for...
$12.00
In Stock
1 x 5V Electromagnet
Use a "50N" one for good pick up ability!

Wiring Diagram

Even though an electromagnet doesn't have 'direction' and thus could be controlled by a Drive pin, we opted for a Motor port because these electromagnets can draw up to 700mA and that's more than the Drive pin. But, you could almost certainly get away with using a Drive pin if you like!

Code!

Save to your CPX as code.py and press the CPX buttons to move the pulley up and down. Capacitive touch pads #1 and #4 twist the servo and then the switch enables and disables the electromagnet.

The most interesting part is smooth_move which is our gentle servo movement helper, it will carefully move the servo rather than jostling it and the magnet which would possibly cause the balls to fall.

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This guide was first published on May 16, 2018. It was last updated on May 21, 2024.

This page (Mag Neat-o) was last updated on May 21, 2024.

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