Book Image

C Programming for Arduino

By : Julien Bayle
Book Image

C Programming for Arduino

By: Julien Bayle

Overview of this book

Physical computing allows us to build interactive physical systems by using software & hardware in order to sense and respond to the real world. C Programming for Arduino will show you how to harness powerful capabilities like sensing, feedbacks, programming and even wiring and developing your own autonomous systems. C Programming for Arduino contains everything you need to directly start wiring and coding your own electronic project. You'll learn C and how to code several types of firmware for your Arduino, and then move on to design small typical systems to understand how handling buttons, leds, LCD, network modules and much more. After running through C/C++ for the Arduino, you'll learn how to control your software by using real buttons and distance sensors and even discover how you can use your Arduino with the Processing framework so that they work in unison. Advanced coverage includes using Wi-Fi networks and batteries to make your Arduino-based hardware more mobile and flexible without wires. If you want to learn how to build your own electronic devices with powerful open-source technology, then this book is for you.
Table of Contents (21 chapters)
C Programming for Arduino
About the Author
About the Reviewers

Multiple servos with external power supply

Let's imagine we need three servos. As explained before, servos are motors, and motors convert current into movement, driving more current than other kinds of devices such as LEDs or sensors.

If your Arduino project requires a computer, you can supply power to it with the USB as long as you don't go beyond the 500 mA limit. Beyond this, you'd need to use an external power supply for some or all parts of your circuit.

Let's see how it goes with three servos.

Three servos and an external power supply

An external power supply can be batteries or a wall adapter power supply.

We are going to use basic AA batteries here. This is also a way to supply Arduino if you don't need a computer and want Arduino to be autonomous. We will consider this option in the third part of this book about more advanced concepts.

Let's check the wiring for now:

Three servos wired to an Arduino, and power supplied by two AA batteries

In cases like this, we have to wire the grounds...