Robotics Light sensors - Basics

Light sensors measure the amount of light that impacts a photocell, a device that has a low resistance when there is light impacting on it. Although this is the basic functioning of a light sensor, we can have other variations that are very commonly used:

• Polarized sensors: they only detect the light that comes from a certain direction.
• Reflective Optosensors: they are a type of active sensor, using a light sensor with a light emitter.
  • Reflectance optosensor: light is emitted and if it reflects with something in front is detected by the light sensor
  • Break-beam: a light beam goes from emitter to sensor, and they detect when something comes between.

These reflective sensors have a problem: the light is reflected depending on many physical qualities of the surface, like the color, distance, if it’s or not a shiny surface… Infra red sensors are commonly used to deal with this problems since they are less prone to interference. 20210524205426

Notes References

20210514183815 INDEX - Robotics

20210523205724 Robotics Simple Sensors - Basics

20210524205426 Robotics Infra-red sensors

References