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Learn about sensors and their applications, specifically the EV3 Colour Sensor. Program your EV3 Model to detect light and follow a line. Understand the impact of speed on sensing capabilities.
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Session 3 Sensors
Session 3 Aims: • To know what a sensor is (you might have introduced the Gyro Sensor in the last session) • Be able to use the EV3 Model to detect lines using a sensor • Be able to use a sensor to control action • Understand how speed can affect sensing on an EV3 Model
What is a Sensor? • An input device that can detect or measure physical property • Can you think of any sensors that you have seen?
We are going to talk a bit about theColour Sensor BUTYou can find more detail in the Help Section of the EV3 software When you are in the software – click on the Help Menu at the top of the screen and choose Show EV3 Help. In this case choose General - Colour
The Colour (& Light) Sensor • Can detect up to 8 colours • Can also detect light intensities (light to dark) via the reflected red light emitted.
How to program the EV3 to detect light The 2 panels you will need are: • Flow control (orange) – for sensors • Action (Green) – for movement
The “Wait” Block Can select logic operators to compare measurements Can select the colour/intensity that you are looking for Can select which sensor you want to use
Challenge - Following a line • Look carefully at the program here and explain what it will do. • What will be the impact on your EV3 Model? • Now, program your EV3 Model to follow the black line on the challenge mat.
Real engineers Making film magic: If you’ve ever wondered how blockbusters get to look so good, it’s down to the work of people like Eugénie von Tunzelmann (picture to the right) who make ground-breaking visual effects. The film industry use a variety of sensors to create amazing effects in films like the Great Gatsby or Harry Potter. Serena is on a mission to prevent plastics from entering our rivers and oceans. Your robots will be doing water clean up challenges too! https://www.youtube.com/watch?v=1YDlvWnhh78