Название: Range Finding, Object Detection and Object Avoidance: Book 4 of the Arduino Short Reads SeriesАвтор: Gary Hallberg
Издательство: North Border Tech Training
Серия: Arduino Short Reads
Год: 2020
Страниц: 90
Язык: английский
Формат: pdf (true), azw3, epub
Размер: 10.1 MB
This is the fourth book of the Arduino Short Reads series. Book 1 covers everything you need to get started with this popular, low cost and versatile micro controller eco-system. This book looks at how to detect objects using infrared and ultrasonic sensors. You then put that knowledge to work with 8 experiments that look at security applications, timing applications and object counting applications. You also get to build a simple object avoiding robot and a robot that follows an object. The book finishes by taking an introductory look at LiDAR, 360 degree and robot vision systems.
The PIR sensor compromises a core sensor of photo-reactive material sensitive to infrared light and a Fresnel lens. We will talk about the lens later. There are 2 slots in the sensors that allows it to ‘see’ out a distance within 2 zones. In normal conditions, when no warm object is present, the radiated infrared heat from buildings and surroundings is consistent across the zones. The output from the sensor is stable. When a warm object that is radiating infrared light passes through a zone, the photo-reactive material will cause a positive differential change in the output voltage of the sensor. Likewise, when the body leaves the zones there will be a negative differential voltage change. The PIR sensor I will be using is the HC-S501. This is a low-cost unit that is ideal for learning with.
The algorithm is simple. The vehicle will move forward until an object is detected in its path. The sensor will then rotate to the left and if no object is detected, it will turn left and continue to move forward. If an object is detected on the left-hand side, the sensor will rotate to the right. If no object is detected on the right-hand side, the vehicle will turn to the right and continue to move forward. If there are objects in front and to each side, the vehicle will reverse a set distance and then first check left and then right if there is still an object on the left.
This series of books are written with the novice engineer in mind, for students or those simply looking to have fun. Whatever your goals are, it is hoped that you find this book useful, engaging and that you have fun.
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