book collections email follower instructable user
Picture of The Hands Free Toothbrush

The hands free toothbrush is a project made by Michael Mitsch, Ross Olsen, Jonathan Morataya, and Mitch Hirt. We wanted to approach a problem that could have a fun solution to build, so we decided to make something that could make it so you didn't have to stop what you are doing with your hands in order to brush your teeth. Yes, with this invention you can continue to text, watch youtube, knit, play video games, or even build more projects with your hands while brushing your teeth.

The photo above shows the finished product. The whole arm piece rotates on a servo motor connected to the base and the toothbrush is driven forward and backward by a DC motor. The gears allow the toothbrush to move in a circle without rotating. The brush starts when someone comes within 30 cm of the ultrasonic sensor plugged into the breadboard. It will brush the middle teeth, turn and get your left teeth, then turn and brush your right teeth.

Step 1: Step 1: Aquire All the Parts

Picture of Step 1: Aquire All the Parts
IMG_5794.jpg

Parts Needed:

- Toothbrush

- Servo motor with metal gears (Tower Pro MG 90S Micro servo)

- DC motor with gear box connected (find here: https://www.adafruit.com/product/3777?gclid=EAIaIQ... )

- Servo topper and servo screws

- Breadboard, wires, AA batteries

- NodeMCU (Micro controller for this project. Alternatives could be used easily and set up easier.)

- Ultrasonic sensor (HCSR 04)

- Motor driver https://www.kr4.us/SparkFun-Motor-Driver-Dual-TB66...

- Super glue

- Duct tape

- Nut x12

- 12mm screw x2

- 25mm screw x4 (I only showed 1 in picture. You actually need 4)

- 30mm screw x4

- Small L Bracket x2 (They look like this https://www.grainger.com/product/1WDD4?gclid=EAIaI... pretty easy to find at hardware store)

- Feet for the base that can stick to the laser cut base

*The screw and nuts are all M3 standard parts. If you are not familiar with screws just get help from someone at a hardware store. They are normally really great at pointing people in the right direction.*

The PDF named combo contains everything you need to laser cut for this project. The stroke width on the lines in the PDF is .003 point and the color of the cut lines is 255,0,0 RGB. We cut all the laser cut pieces out of acrylic because it is sturdy and looks cool, but other material could be used. The holes in the laser cut pieces are sized to fit a screw's diameter minus the threads so a 3M screw will screw into the holes.

Sounds like a lot of parts but the assembly really is not very hard!

Yonatan248 months ago
IC_Biker9 months ago
There are linkages that will convert rotary motion into reciprocating linear motion without the need to reverse the motor direction. https://www.youtube.com/watch?v=poDwOv3unD8
Ophion9 months ago
Looks like a medieval torture device. ;)
This is the coolest electric toothbrush that I has seen.
mfmitsch (author)  DIY Hacks and How Tos9 months ago
Thanks man