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You're reading from ESP8266 Home Automation Projects

Product typeBook

Published inNov 2017

PublisherPackt

ISBN-139781787282629

Edition1st Edition

Tools

ESP8266

Concepts

Home Automation

Authors (2):

Catalin Batrinu

Constantin Tambrea

View More author details

Temperature sensor

There are a lot of temperature sensors that can be used, but for this project we will use a very common one, the DTH22. It can measure temperature and humidity.

The following are the DHT22 characteristics:

Low cost
3 to 5V power and I/O
5mA max current used during conversion (while requesting data)
Good for 0-100% humidity readings with 2-5% accuracy
Good for -40 to 125°C temperature readings ±0.5°C accuracy
No more than 0.5 Hz sampling rate (once every two seconds)
Body size 15.1mm x 25mm x 7.7mm
4 pins with 0.1" spacing

DHT22 can be found as a separate sensor or as a breakout. It is preferrable to buy the breakout version since it has also the pull-up 4k7 resistor and a capacitor. If you prefer the sensor alone this is the pinout:

DHT22 pinout

Here:

VCC: can be between 3V3 and 5V
GND: is the ground
DATA: is the data pin

Don't forget to add a 4K7 pull-up resistor between the DATA and VCC pin. For the connection with a gas furnance or other heating element, a relay will be added on the...

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ESP8266 Home Automation Projects

Published in: Nov 2017Publisher: PacktISBN-13: 9781787282629

Authors (2)

Catalin Batrinu

Catalin Batrinu graduated from the Politehnica University of Bucharest in Electronics, Telecommunications, and Information Technology. He has been working as a software developer in telecommunications for the past 16 years. He has worked with old protocols and the latest network protocols and technologies, so he has experienced all transformations in the telecommunication industry. He has implemented many telecommunications protocols, from access adaptations and backbone switches to high-capacity, carrier-grade switches on various hardware platforms from Wintegra and Broadcom. Internet of Things came as a natural evolution for him and now he collaborates with different companies to construct the world of tomorrow that will make our life more comfortable and secure. Using the ESP8266, he has prototyped devices such as irrigation controllers, smart sockets, window shutters, Digital Addressable Lighting Controls, and environment controls, all of them controlled directly from a mobile application over the cloud. An MQTT broker with bridging and a WebSockets server was even developed for the ESP8266. Soon, all those devices will be part of our daily life, so we will all enjoy their functionality.
Read more about Catalin Batrinu

Constantin Tambrea

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