THE ESP32 IOT BIBLE: Android Programming for ESP32 IoT Devices Build Your Own Connected Devices with Android Apps and Node Communication by Nakamoto Sanji

Author:Nakamoto, Sanji
Language: eng
Format: epub
Publisher: Sanji Nakamoto
Published: 2023-11-19T00:00:00+00:00

Inside the 'loop' function, we have only one function which is the 'Blynk.run'. So that's all about the home automation ESP32 programming. I have already uploaded this program. Let's watch this project in action. As I said earlier, there's no need to make any changes on the hardware side if you plan to use this circuit with a Bluetooth-supported cell phone application. You will only need to write another program for the ESP32 module in order to be able to receive data wirelessly from the ESP32 using Bluetooth.

Let's take a look at the ESP32 Bluetooth module programming. This program uses only one header file, 'BluetoothSerial.h', and you don't need to search for this header file because you will get this header file once you install your ESP32 board. If you are using the ESP32 built-in Bluetooth module, then you will need to add these lines of code. Next, I defined a variable 'blueData' of type long integer. I'll be using this for storing the passwords which will be sent via the Android cell phone application and will be compared with my predefined passwords.

4 relays are connected to the ESP32 pins 13, 12, 14, and 27. I selected strong passwords to control these relays. In the 'setup' function, I activated the serial communication and I also set the Bluetooth device name as the 'ESP32 Electronic Clinic'. Next, using the 'pinMode' function, I set all the relays as output and using the 'digitalWrite' function, I turned off all the relays as they should be in the off state by default.

In the 'loop' function, we are simply monitoring the Bluetooth module. So if data is received, then compare it with the predefined password values. And if the received value is the same, then turn on or turn off the load. For more detailed discussion, read my article available on electronicclinic.com. I will provide a link in the description. So that's all about the programming.

In order to control these relays wirelessly using Bluetooth, you will need an application on your cell phone which you can download from our website, or you can design one yourself by reading my article in which I have explained everything. Now let's watch the ESP32 Bluetooth module-based home automation in action.

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