ESP32 programming using Arduino IDE

Introduction

ESP-WROOM-32:

This is the brain of this module. This is a Tensilica Xtensa 32-bit LX6 microprocessor which is developed by Espressif systems. If you want to know in depth about ESP32 chip then please refer ESP-WROOM-32 Datasheet. This has a clock frequency of up to 240 MHz.

EN Button:

This button is also known as reset. It will rest the code running in ESP32 module.

Boot Button:

This is used to upload programs to this module. When Arduino will start uploading the sketch, you have to keep it pressed until it stats loading in Arduino IDE.

if you press both the buttons together i.e. Boot and EN, the modules enters to firmware uploading mode.

Red LED:

Red LED will glow once the module is powered ON. This is a power indicator.

Blue LED:

Blue LED is connected to GPIO pin and it can be turned on/off using programs.

Peripherals and I/O:

ESP32 has total 48 GPIO pins, out of which 25 of them are present as pin headers on both sides of the module. These pins are capable of below uses

• 15 channels of 12-bit SAR ADC’s
• 2 UART interfaces
• 25 channels of PWM pins
• 2 8-bit DACs to produce true analog voltages.
• 3 SPI and 1 I2C interfaces to connect sensors and peripherals
• 9 GPIOs for capacitive touch sensing.

If you are a deep learner then you can follow ESP32 Datasheet.

Micro USB: 

This module is equipped with a micro usb jack. This jack heps in connecting this module with computer for uploading codes easily. All you need is a micro usb cable. This jack can also used for serial communication. It has a CP2102 USB-to-UART converter which supports 5 Mbps communication speed.

Below are the technical details of ESP32

Parts Required

• ESP32 Module
• Arduino IDE
• Micro USB cable

Arduino Setup

First we need to setup Arduino IDE for uploading code in ESP32

Go to File -> Preference 

Copy below URL’s and paste it in Additional Boards Manager URL’s

https://dl.espressif.com/dl/package_esp32_index.json,

http://arduino.esp8266.com/stable/package_esp8266com_index.json

Once you paste it, Click on OK

Now we need to add ESP32 board from Boards Manager

Tools -> Board -> Boards Manager

After opening Boards Manager type ESP32 in search box

You will find ESP32 By Espressif Systems click on Install. It will start installing

Soon it will be marked as INSTALLED

Now lets search for ESP32 boards.

Go to Tools -> Board 

Scroll down and search for ESP32 Dev Module. Select it

After selection you will see the same in right hand bottom corner

Connect you ESP32 Module with computer using USB cable

Connection

Connect one end of the cable with micro USB and other end with your laptop or computer.

Code

If you have connected you ESP32 module with your computer and configured Arduino IDE with above configurations, then you are almost ready to upload your first code. Below code will blink the blue led.

int LED_BUILTIN = 2;
void setup()
{
pinMode(LED_BUILTIN, OUTPUT); // Initialize the LED_BUILTIN pin as an output
}
void loop() // the loop function runs over and over again forever
{
digitalWrite(LED_BUILTIN, LOW); // Turn the LED on
delay(1000); // Wait for a second
digitalWrite(LED_BUILTIN, HIGH); // Turn the LED off
delay(1000); // Wait for a seconds
}

Uploading Code

Testing

Once code is uploaded successfully, we will see the blue light starts blinking. This indicate the code is uploaded correctly and working fine. ESP32 programming using Arduino IDE is completed.