Useless Box with 4xAA Batteries and LED

This model is manufactured with a cheaper Arduino nano. Program have 7 different and random activation of the toggle switch. The Box is powered with 4 batteries type AA (dont use AAA because they dont have enough power to meve the servo and activate the lever), I prefer batteries instead of usb because in this way you can play with the box at any place.

Servo is MG90S that has stronger torque that MG90, I found that MG90 or similar dont have enough strength to move the lever.

Arduino nano and battery holder are fixed on the bottom of the box using a piece of velcro tape (you can use silicon if you prefer).

Electrical connections are shown in the electrical drawing enclosed. Included a led 5mm white connected to pin D12.

To adjust the servo travel limit please load the small program in the Nano and adjust the values for the limits (minimu 400, maximum 2400) . If not enough move the lever fisically. Put the numbers of maximum and minimum travel to the main program. Adjust here (in my case, 2000 and 400):

const int PALANCA_ESCONDIDA = 2000;  // Reposo (Abajo)
const int PALANCA_APAGAR = 400;      // Pulsando (Arriba)

Print:

No brims needed to Print

PLA used with 30% infill

box.stl is the original file from Wiz for ESP32, the box.gcode and box.3mf are files modified 

Material:

1 Arduino nano

4 x Batteries type AA with battery holder

1 Servo MG90S

1 Toggle microswitch (10mm lever or a little longer)

1 Power switch on/off 20x7mm

1 LED white 5mm + 1 Resistor 220ohm 

5 small M3 screws for top lid

5 brass inserts M3x5,7x4,6

wires