Toy construction system with robotics control unit

A robotics control unit for use in a toy construction robotics system, wherein the robotics control unit comprises:

• a housing comprising coupling elements configured for releasably interconnecting the robotics control unit with cooperating toy construction elements;
• a processor comprising programmed instructions;
• a plurality of I/O-ports configured to communicate with the processor;
• a plurality of separate light emitters, each of the light emitters being operable, in response to instructions from the processor, to selectively produce at least two different indicator states;
• wherein the light emitters are arranged in a two-dimensional matrix of orthogonal columns and rows, each of the rows extending between a first end and a second end, wherein the first ends of the rows define a first edge of the matrix and the second ends of the rows define a second edge of the matrix opposite to the first edge;
• wherein each of the plurality of I/O ports is positioned on a line defined by one of the rows and at one of the first and second ends of said row;
• and
• wherein the light emitters are operable, in response to instructions from the processor, to produce a machine readable code encoding data in respect of the robotics control unit.