I considered acrylic plastic material to give it a feeling of lightness, almost as if it were only the reflecting surface that was in front of you. In order to do that, I thought of a pressfit type structure, although I did tests for the acrylic, I had problems with tolerance since the plates do not have the same even thickness, there are variations from one plate to another. A 0.05mm tolerance seemd to wok, but not fine.

The design scheme consists of an acrylic plastic structure that supports a mechanism that moves thanks to a steppermotor. The motor drives a mechanical arm with internal gear that carries a light to its end. In the back it also has an LED light strip. The acrylic front frame serves to support a series of six ultrasonic sensors and a pir sensor. Finally in the front part there is also another frame that holds the mirror through pressfit unions and prevents it from falling.

The idea is that the Pir sensor detects the presence of the person and activate the moving light, as well as the LED light ribbon. The ultrasonic sensors are used to activate by proximity or distance (less than 30cm) the mechanical arm to bring the light to that point.

In order to be able to assemble the structure, I must have had the gears. For this I designed mine taking as a reference some bearings of a 3D printed spinner that I found in Thingiverse and using Gear Generator3 software. The gears, as an involute sistem, the radius of both small and big gears depend on the space they had for proper operation.When the pieces were ready, I proceeded to assemble the structure.

Once the base structure was ready, I started designing the accessories in Rhinoceros, and then printing them in 3D. Couplings were designed between the acrylic and the sensor, for the ultrasonic sensors and for the Pir sensor. The accessory for the LED lights of the mechanical arm was also designed and a modular chain fixed to the structure that protected the cable that power the LEDs. The chain was redesigned from a Thingiverse model and adapted to the use of the mirror.

Before assembling all the electronics, it was prudent to test the components separately, so I tested the sensors one by one, the stepper motor and the lights, I even set the regulator output in 5v.

BOM

Here at ESAB's FABLAB, we had most of the materials and components used in the project, such as acrylic sheets as well as electronic components. However, there are some modules and materials that should have been purchased, such as the voltage regulator, the 12v / 5amp source, the 17 white LED truhole (in the laboratory there was not the amount I needed) and resistors of 270 and 470 ohm.