Euglena is a genus of single-celled organisms that live in bodies of fresh and salt water. Most species of Euglena have chloroplasts that are used for photosynthesis, much like plants. Additionally, most contain a single photoreceptor and eyespot, allowing the Euglena to track and move toward light sources. To learn more about Euglena, see this Wikipedia page. You can also see hundreds of Euglenas swimming around in this video.

To emulate Euglena behavior, we’re going to make a light-seeking robot that moves toward areas of bright light. The SIK v4.0 only comes with one photocell (light sensor), which means that we will need to have our robotic “organism” turn left and right in order to detect the direction of brightest light.”