Book Image

Arduino Home Automation Projects

By : Marco Schwartz
Book Image

Arduino Home Automation Projects

By: Marco Schwartz

Overview of this book

Table of Contents (14 chapters)
Arduino Home Automation Projects
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Creating the Arduino sketch


Let's now build a simple sketch to test our sensor via Bluetooth. We are going to build a sketch so that it measures the temperature and humidity from the DHT sensor when a given command is received on the serial port.

We start by including the DHT library so that we can use the DHT11 sensor:

#include "DHT.h"

Then, define the sensor's pin and type:

#define DHTPIN 7
#define DHTTYPE DHT11

Note that if you are using a different DHT sensor, you will need to modify the code here. For example, if you are using a DHT22 sensor, simply type the following:

#define DHTTYPE DHT22

You will also need to define an instance of the DHT sensor and to send the sensor type and sensor pin as an argument:

DHT dht(DHTPIN, DHTTYPE);

In the setup() function of the sketch, you will have to initialize the DHT sensor's instance and start the serial connection:

dht.begin();
Serial.begin(115200);

We need to use a speed of 115,200 bauds here instead of the standard 9600 bauds, as it is recommended in...