LEGO specifications

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LEGO dimensions

See and

A 1x1 brick is 8 mm by 8 mm width, and 9.6 mm (3x 3.2) high.

The stud on top of a brick has 4.8 mm ⌀, and is 1.8 mm high.

LEGO Power Functions

See e.g.

LEGO power functions works with 9V. A cable has 4 wires: 9 Volt, ground, C1 and C2. C1 and C2 are either 0 Volt or +9 Volt, and are used to power motors or lights.

Speed of motors are controlled with a pulse width modulation (PWM) on C1 and C2.