This section contains a quick review for teachers of the science and concepts covered in this lesson. The Arduino UNO (Figure 1) is a microcontroller board that is widely used in the hobbyist, maker, and educational communities. It allows people with no formal engineering training to get started with their own electronics and robotics projects. It is designed to make prototyping electronics projects easy. You can quickly take apart your project, build a new circuit, and upload a new program.