Bluetooth Classic and Low Energy with Arduino IDE and ESP32

 Welcome to Another Article...!

Today's article will show how to use both Bluetooth Classic and Bluetooth Low Energy which featured in ESP32. Bluetooth feature in ESP32 allow data to be exchanged between it and an Android smartphone.

STEP 1: Required Hardware and Software

1. ESP32 Development Board
2. PC (with Arduino IDE)
3. BMP280 sensor (any sensor will suffice)
4. Jumper wires
5. Breadboard
6. Android Smartphone (with Serial Bluetooth Terminal)

STEP 2: Circuit Assembling

Since BMP280 using I2C protocol, I will be using 4 pins. The pins are shown in picture below.

STEP 3: Source Code

The code will be shown below. 


We include 3 libraries, those are "Wire.h" for I2C, "Adafruit_BMP280.h" for BMP280, and "BluetoothSerial.h" for bluetooth. Then initialize variable needed.

For the setup, begin the serial and serial Bluetooth. I will be using "ESP32" for its name. Then initialize the BMP280 sensor.

For the loop, it will print in Serial Bluetooth every 5000 ms the measurement from the BMP280 sensor.

STEP 4: Uploading and Connecting

After the source code is done, upload it to ESP32. When Arduino IDE done uploading the code, install Serial Bluetooth Terminal in the Android smartphone.

Pair the ESP32 devices in Bluetooth settings then open devices in the app, then select the ESP32.



The measurement then will be send into the Android smartphone as shown below.



Bluetooth Low Energy (BLE)

This second section of the article will show how to use the Bluetooth Low Energy using ESP32 and Arduino IDE.

STEP 1: Required Hardware and Software

1. ESP32 Development Board
2. PC (with Arduino IDE)
3. Android Smarpthone (with nRF Connect)

STEP 2: Source Code

Since we will be using only ESP32, there will be no circuit assembly. For the source code, you can go to File > Examples > ESP32 BLE Arduino > BLE_server. The code will open as shown below.

I am changing the device name to "ESP32_BLE" and the message as shown above.

STEP 3: Uploading the Code

After verifying the code, upload it into ESP32. For the smartphone, make sure to install nRF Connect.
After installing the app, open it and go to Scanner section. Find the device name then click connect.

After it connected, go to its tab and open the client. Find the Unknown Service and click it. It should have 2 properties, read and write. Click the download button for the read and it will show the message.




Comments

Post a Comment

Popular posts from this blog

Programming "Blinking Internal LED" on ESP32 using Arduino IDE

Image
 Hello everyone! This article contains step-by-step how to program on ESP32 using Arduino IDE. The example below will show the simplest program for ESP32, which is making it's internal LED blink with interval timing. STEP 1: Required Hardwares 1. ESP32 I am going to use ESP32 Devkit V1 with 30 pins . 2. PC To develop the code and power source. 3. Micro USB Cable ESP32 uses micro USB cable to connect to it's power source and/or source code 4. Breadboard (optional) I use breadboard to ensure ESP32's pin safety STEP 2: Required Softwares 1. Installing Arduino IDE, you can download it from:  https://www.arduino.cc/en/software 2. Installing the correct board you are using by going to File > Preferences. Insert this URL into "Additional Boards Manager URLs":  https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json 3. Go to Tools > Board > Boards Manager and then search and install esp32 module. Thereafter, choose which board ...
Read more

"Built-in Touch, Hall-Effect, and Temperature Sensor" on ESP32 using Arduino

Image
 Bonjour...! Today's article will show how to use 3 built-in sensors in ESP32. Those 3 sensors are touch sensor, hall effect sensor, and temperature sensor. In case you don't know, the temperature sensor in ESP32 only detect the internal temperature of itself and not its external. Without further ado, let's get straight into it! Required Hardware and Software ESP32 Development Board PC with Arduino IDE Micro USB Cable Mini LED Lamp For output indicator Resistor 330 Ohm resistance Male-to-male Jumper Cable Magnet For testing hall-effect sensor Breadboard  (Optional) Touch Sensor STEP 1: Assembling the Circuit Since not all pin in ESP32 can read touch input, make sure to use pin that accept touch input. For guideline, here is ESP32 DEVKIT V1 with 30 pins. Source: randomnerdtutorials.com The circuit is not complex, I just connect GPIO4 to a jumper cable as a touch input. Since there are no output indicator, I will be using serial monitor. STEP 2: The Source Code For the source...
Read more

Multiple I2C Devices using ESP32

Image
 Hello, Dear Reader! In today's article, I will be showing how to setup multiple devices with I2C communication protocol using ESP32 development board. It requires knowledge about I2C so make sure to find some information about the communication protocol. I2C Communication Protocol I2C (Inter-Integrated Circuit) is one of the serial communication protocol beside SPI and UART. It is a two line communication between modules which using SDA (Serial Data Line) and SCL (Serial Clock Line). It uses 2 pin which are GPIO 21 (SDA) and GPIO 22 (SCL) in ESP32. Even with only 2 pins, it can control 2 or more devices as long as the devices doesn't have same address. STEP 1: Required Hardware and Software 1. ESP32 Development Board, 2. PC (with Arduino IDE), 3. OLED display (I2C version), 4. BMP280 sensor, 5. Jumper wires, 6. Breadboard I will be using BMP280 and OLED display for both I2C devices. They have different address (0x3C for OLED and 0x76 or 0x77 for BMP280) so both devices can be ...
Read more