In the meantime, we’ve got a rich history of obstacle-avoiding robots here on Hackaday. Take a look around. Posted in Robots Hacks Tagged Crazy Circuits , HC-SR04 , lego , proximity , robotics ...

It’s an Arduino board that has rows of holes at either end to make it LEGO compatible. It also carries an LM293D motor controller and [Sath02] added an XBee module for wireless control.