ARDUINO ROBOTICS BY JOHN-DAVID WARREN JOSH ADAMS HARALD MOLLE PDF
Veja grátis o arquivo Arduino Robotics John David Warren, Josh Adams and Harald Molle enviado para a disciplina de Arduino Categoria: Outros – Veja grátis o arquivo Arduino Robotics John David Warren, Josh Adams and Harald Molle enviado para a disciplina de Arduino Categoria: Outros – 9. Arduino Robotics. by Harald Molle, Josh Adams, John-David Warren. Publisher: Apress. Release Date: July ISBN: View table of.
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Enviado por Estudante PD flag Denunciar. Several of the projects in this book use motors intended to carry a person.
These motors are strong enough to do physical harm to people if the robot were to get out of control. For this reason, I suggest that you keep people and pets at least 20 feet away from your moving bots unless thoroughly testedfor their own safety. Summary To recap this chapter, we first discussed the basics of electricity including an electrical flow analogy, electrical properties, circuits, robbotics types of connections. After talking about electricity, we moved into electronics and discussed semi-conductors, data sheets, integrated circuits, and IC packages.
Then a small hsrald to the Arduino micro-controller including the Arduino IDE, two main Arduino variants Standard and Megathe components of a sketch, and finally the different types of common signals available on jozh Arduino.
Arduino Robotics [Book]
With a brief discussion about electronics circuit design and some of the different types of schematic symbols used for various electronic components, we went over the basic tools you need for the projects in this book and the materials that are used. In the next chapter, we discuss how areuino interface the Arduino with a variety of different devices.
This chapter focuses on how to interface your Arduino to mechanical, electronic, and optical switches, as well as some different input control methods, and finally some talk about sensors. First we discuss the basics of interfacing relays, transistors, and motor-controllers to the Arduino.
We then discuss the various methods of controlling your Arduino—focusing on the popular methods of wireless control. Lastly, I give you my two cents about the many different types of sensors available for robotic use. There are no code examples in this chapter, but the information presented is useful to understand the interfacing methods, control types, and sensors used throughout this book.
Interfacing Arduino Because the Arduino can supply only around 40ma of current through any one of its Output pins, it is severely limited to what it can power by itself.
A basic amplifier has an input and an output—the input is a low-power signal like the Arduino and is used to drive the larger output signal that will power the load. A perfect amplifier is able to switch the high-power signal as quickly and efficiently as the Arduino switches the low-power signal. In reality, amplifiers are not perfectly efficient and some heat is dissipated in the switching process, which often requires the use of a heat sink on the switching device and possibly a fan to remove heat like the CPU in your computer.
There are different types of amplifying circuits that can be interfaced with the Arduino depending on the type of signal output used.
For slow-switching signals using the digitalWrite command, you can interface the Arduino to a high-power relay. You can also purchase ,olle preassembled electronic speed hagald and use the Arduino to provide the input control signals.
A solenoid is similar to a motor because it uses a magnetic field to produce physical movement of the solenoid cylinder—but instead of spinning like a motor output shaft, the solenoid cylinder moves back and forth in a linear motion. Most relays are encased in a plastic or metal housing to keep the moving parts free from outside interference and dust see Figure Here you can see a variety of relays in small to large sizes.
Lastly, the mammoth relay on the far right is an automotive power relay, which is rated at 60 amps. There are two parts to a relay: These two parts can essentially be treated as separate but related parts of a circuit, because each has its own ratings.
The solenoid inside a relay has an electrical coil with a magnetic plunger that provides the movement needed to flip the contactor switch on and off.
The relay coil should have the coil resistance listed as well as the operating voltage so that you can calculate how much current it will consume when in use. The contactor in a relay is where the high-power signal is switched. The contactor switch also has a voltage and current rating that tells you how much power you can expect the relay to conduct before the contacts fail.
Types of Relays Relays are available with several different operation types depending on your application, so it is useful to understand how each type operates to make sure you get the right relay for the job. This simply means that the two power contacts of the relay are connected when the relay coil is turned on and disconnected when the relay coil is turned off. This is the opposite of Normally-Open; the power contacts are connected when the relay is off and disconnected when the relay is on.
This means that the contactor switch in the relay is not spring-loaded, and it stays in whatever position it is placed into until the polarity is reversed to the coil, which returns the contactor switch to its original position. This is comparable to a standard home light switch—it stays on until you turn it off. The relay contactor switch is spring-loaded and returns to the preset position unless power is applied to the coil.
This is comparable to bg momentary button switch—it stays on only while you press the button; otherwise, it springs back to the off position. Relay Configurations In addition to having different operating types, relays can have their contacts arranged in various configurations depending on the use.
There are four common types of relays that we briefly discuss— each of these relays has only solenoid coil, but a varying number of power contacts. Any of these relay configurations can be Normally-Open or Normally-Closed as well as latching.