This is a prototype of a radio cube for a children's kit for learning the basics of electronics. A printed circuit board with an element (resistor, capacitor, diode) is inserted into it. The cubes are connected to each other using Arduino wires. This creates an electrical circuit. Several cubes are planned - for two-terminal, three-terminal, buttons, LEDs and a large battery compartment.

Nut and countersunk screw - M3

1. RCUBE 2-terminal
2. RCUBE 3-terminal
3. RCUBE 2-terminal with hole for 5mm LED