A microcontroller is a small computer on a single integrated circuit that can be used to control electronic devices. It consists of a central processing unit (CPU), memory, and input/output (I/O) ports. Microcontrollers are used in many applications, such as automobiles, appliances, and medical devices. Join now Continuous integration (CI) is the practice of continuously building and testing code changes as they are made, to catch and fix problems early in the development cycle. CI is an essential part of DevOps and agile software development. Popular CI tools include Jenkins, Travis CI, and CircleCI.