Book Image

Practical Python Programming for IoT

By : Gary Smart
Book Image

Practical Python Programming for IoT

By: Gary Smart

Overview of this book

The age of connected devices is here, be it fitness bands or smart homes. It's now more important than ever to understand how hardware components interact with the internet to collect and analyze user data. The Internet of Things (IoT), combined with the popular open source language Python, can be used to build powerful and intelligent IoT systems with intuitive interfaces. This book consists of three parts, with the first focusing on the "Internet" component of IoT. You'll get to grips with end-to-end IoT app development to control an LED over the internet, before learning how to build RESTful APIs, WebSocket APIs, and MQTT services in Python. The second part delves into the fundamentals behind electronics and GPIO interfacing. As you progress to the last part, you'll focus on the "Things" aspect of IoT, where you will learn how to connect and control a range of electronic sensors and actuators using Python. You'll also explore a variety of topics, such as motor control, ultrasonic sensors, and temperature measurement. Finally, you'll get up to speed with advanced IoT programming techniques in Python, integrate with IoT visualization and automation platforms, and build a comprehensive IoT project. By the end of this book, you'll be well-versed with IoT development and have the knowledge you need to build sophisticated IoT systems using Python.
Table of Contents (20 chapters)
1
Section 1: Programming with Python and the Raspberry Pi
6
Section 2: Practical Electronics for Interacting with the Physical World
9
Section 3: IoT Playground - Practical Examples to Interact with the Physical World

Calculating the resistor's power dissipation

General-purpose resistors like the ones we're using in our breadboards are commonly rated to be 1/8 Watt, 1/4 Watt, or 1/2 Watt. If you supply too much power to a resistor, it will burn out with a puff of smoke and give off a horrible smell.

Here is how we calculate the power dissipation of our 200Ω resistor when we have a 3.3-volt power source:

  1. The power dissipated by a resistor can be calculated with the following formula. Note that the voltage V is the voltage drop across the resistor in volts, while R is the resistance in Ohms:

  1. Therefore, when we substitute our resistor's voltage drop and resistance value in the formula, we get the following:

= 0.0072 Watts, or 7.2 milliwatts (or mW)

  1. Our power value of 7.2 mW is below even a 0.25 Watt-rated resistor, so a 1/8 Watt or above resistor is safe in our circuits and will not burn out in a puff of smoke.

If you think the power equation looks different...