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

Chapter 9

  1. The DHT22 is a more accurate sensor, and it is capable of sensing a greater range of temperatures and humanities. 
  2. The external pull-up resistor is optional because our Raspberry Pi can use its internal embedded pull-up resistor.
  1. An LDR is a light-sensitive resistor. When used as part of a voltage-divider circuit, we turn the varying resistance into a varying voltage. This voltage can then be detected by an analog-to-digital converter such as the ADS1115, which is connected to your Raspberry Pi.
  2. Try varying the resistance of the fixed resistor in the voltage-divider circuit. Try higher-value resistances to make the LDR more sensitive in darker conditions. Try lower-resistance values to make the LDR more sensitive to brighter conditions.
  3. No two LDRs are identical when it comes to the resistances they measure. If you swap out an LDR in a circuit, re-calibrate the code just to be sure.
  4. Water conducts electricity. It acts as a resistor between the two probe wires...