The 'Move' circuit assembly

Site: ΕΛ/ΛΑΚ Moodle
Course: 3D printing with circuits and Arduino
Book: The 'Move' circuit assembly
Printed by: Guest user
Date: Friday, 1 July 2022, 2:13 PM


Assemble a simple, pre-made circuit with vibration that you can incorporate into your 3D designs.

1. Introduction

In this tutorial, you'll learn how to build a moving 3D designs using the Move Circuit Assembly, which combines a vibration motor, slide switch, and battery. With the provided holder and cutout shapes in Tinkercad, it's simple to make your 3D prints dance around.

You'll need 3D printing tools, a pair of wire strippers, needlenose pliers, and three electronic components:

  1. Small vibration motor (10mm)
  2. Mini slide switch
  3. Coin cell battery (2032)

    Picture of Build the Move Circuit Assembly

    IMPORTANT: Coin cell batteries can cause serious injury if swallowed. Keep coin cell batteries out of reach of small children!

    2. 3D Print the Move holder

    Open up a new 3D design in Tinkercad, then click the Shapes Panel dropdown and select Circuit Assemblies from the list of Tinkercad Shapes.

    Picture of 3D Print the Move Holder

    Move a Move holder to the workplane. You'll notice that scaling is locked, so you can't resize it. This restriction is in place because specific, real life, electronic components need to fit into the holder.

    Export the holder as a .STL file to prepare for printing. When you import the Move holder onto the Tinkercad workplane, illustrations of the electrical components are shown, but will not export/print along with the holder. They are there only so you can see where the components sit in the holder.

    Now it's time to 3D print your parts! Our recommended settings are 20% infill with raft enabled. Supports are optional, but if you use them, remember to remove them after printing with a pair of needle-nose pliers.

    3. Add the vibration motor

    If your motor's exposed wire leads are super tiny, use wire strippers to remove some of the insulation. Peel the adhesive backing from the vibration motor and stick the motor to the 3D printed holder inside the round indentation.

    Picture of Add the Vibration Motor

    Guide the black wire into the channel on the left side of the holder and direct the end of the wire into the centre of the module.

    As a finishing touch, bend the stripped wire end upwards. It's this wire end that will make the connection with the NEGATIVE (-) side of the coin battery and this upwards bend ensures good contact.

    4. Place the coin cell battery into the holder

    Add your coin cell battery into the holder with the positive side (+) of the battery facing up. The negative side of the battery should be touching the black wire's exposed end. Make sure that the red wire from the vibration motor is not underneath the battery.

    Picture of Place Your Coin Cell Battery Into the Holder

    5. Troubleshooting a loose battery

    Due to differences in printer resolution, there's a chance you may end up with a slightly 'loose' battery – meaning it moves around within the holder when you shake the module side-to-side. If this is the case for you, the looseness could compromise the contact between the battery and the stripped blue wire end.

    There is a super easy fix for this! Use a small square of scotch tape to tape the stripped blue wire end to the center of the bottom negative (-) side of the battery. Then slide it back into place in the holder, positive (+) side up. This should fix any possible contact issues.

    Picture of Troubleshooting a Loose Battery

    6. Add the slideswitch

    Press the switch into place from the opposite side of the module, so the pins face in towards the wires and battery.

    Picture of Add Your Slideswitch

    Press down on the battery when inserting the switch to ensure the battery is underneath the bottom switch pin.

    If it's not touching, use your finger to press and bend the pin down until it is. If using your fingers didn't create enough of a bend to make contact, gently pull the switch back out and use the needle-nose pliers to bend it down even further. Repeat until you have a solid connection between the bottom pin and the battery.

    Picture of Add Your Slideswitch

    Before wiring the motor up to the switch, you can test your blue wire connection to the battery by touching the red wire to the positive (+), or top, side of the battery. The vibration motor should turn on! If it doesn't, remove the switch and tape the motor's blue wire end to the negative (-) underside of the battery like suggested in the previous step. Replace the switch and continue creating your circuit.

    7. Connect the vibration motor and slideswitch

    The last step is to connect the vibration motor to the switch so it's easy to turn on and off.

    You may want to slide the switch to the top position to prevent your motor from turning on when you are wiring the switch.

      Picture of Connect the Vibration Motor and Slideswitch

      Thread the positive (red) wire from the vibration motor into the hole of the middle pin of the slide switch, ensuring that the wire does not touch the bottom pin of the switch.

      Use needle-nose pliers to give the connection a good squeeze, which will help secure the wire to the pin and ensure that the wire does not touch any other pin of the slide switch.

      8. Switch and shake!

      Turn the Move Circuit Assembly on by sliding the switch to the bottom position. At this point, your assembly should be moving!

      Picture of Switch and Shake!

      Material and images adapted from the Build the Move Circuit Assembly Instructable authored by Tinkercad.