Modulo Labs Modulos are compact, interchangeable smart modules. Each Modulo offers a unique function, and has its own little processor to handle its operation and communicate with the controller. Building projects with Modulo is ridiculously easy, simply slide the Modulos that suit your project into a Modulo Base. Each base holds up to four Modulos. Bases can be connected together with extension cables if you need more room. Each Modulo is smart enough to handle all the low level details of its own operation, so you never need to worry about things like pin numbers or registers.