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Getting Started with the ESP32 Development Board


This article is a getting started guide for the ESP32 development board. If you’re familiar with the ESP8266, the ESP32 is its sucessor. The ESP32 is loaded with lots of new features. The most relevant: it combines WiFi and Bluetooth wireless capabilities and it’s dual core.

ESP32 DEVKIT DOIT
In this post, we’ll be using the ESP32 DEVKIT DOIT board as a reference. But the information on this page is also compatible with other ESP32 development boards with the ESP-WROOM-32 chip.

Here’s some examples of ESP32 boards:

Where to Buy?

Our ESP32 projects are build using mainly the ESP32 DEVKIT DOIT board and that’s the one we recommend getting.
You can also read the following article that compares several ESP32 development boards: ESP32 Development Boards.

Specifications

When it comes to the ESP32 chip specifications, you’ll find that:
  • The ESP32 is dual core, this means it has 2 processors.
  • It has Wi-Fi and bluetooth built-in.
  • It runs 32 bit programs.
  • The clock frequency can go up to 240MHz and it has a 512 kB RAM.
  • This particular board has 30 or 36 pins, 15 in each row.
  • It also has wide variety of peripherals available, like: capacitive touch, ADCs, DACs, UART, SPI, I2C and much more.
  • It comes with built-in hall effect sensor and built-in temperature sensor.

Programming Environments

The ESP32 can be programmed in different programming environments. You can use:
  • Arduino IDE
  • Espressif IDF (IoT Development Framework)
  • Micropython
  • JavaScript
  • LUA

Preparing the ESP32 Board in Arduino IDE

There’s an add-on for the Arduino IDE allows you to program the ESP32 using the Arduino IDE and its programming language. Follow one of the next tutorials to prepare your Arduino IDE:

ESP32 Pinout Guide

With the ESP32 you can decide which pins are UART, I2C, or SPI – you just need to set that on the code. This is possible due to the ESP32 chip’s multiplexing feature that allows to assign multiple functions to the same pin. If you don’t set them on the code, the pins will be used as default – as shown in the figure below (the pin location can change depending on the manufacturer).
Version with 30 GPIOs


Upload Code to the ESP32 using Arduino IDE


To show you how to upload code to your ESP32 board, we’ll build a simple example to blink an LED.
Copy the following code to your Arduino IDE:
/*
  Blink
*/

// ledPin refers to ESP32 GPIO 23
const int ledPin = 23;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin ledPin as an output.
  pinMode(ledPin, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                  // wait for a second
  digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                  // wait for a second
}

in this code, we’re controlling an LED connected to GPIO 23.

So, connect an LED to your ESP32 by following the next schematic diagram.
Important: always check the pinout for your specific board before building any circuit.
Plug your ESP32 development board to your computer and follow these next instructions:
1) Go to Tools > Board, scroll down to the ESP32 section and select the name of your ESP32 board. In my case, it’s the DOIT ESP32 DEVKIT V1 board.
2) Go to Tools > Port and select a COM port available.
3) Press the upload button.
That’s it!
Note: If you get the following error when trying to upload code, it means that your ESP32 is not in flashing/uploading mode.
To upload code, you need to follow the next steps (make sure you have the right board selected:
  • Hold-down the “BOOT” button in your ESP32 board
After you see the  “Connecting….” message in your Arduino IDE, release the finger from the “BOOT” button:\
  • After that, you should see the “Done uploading” message.
That’s it. After uploading the new sketch, you can press the “ENABLE” button to restart the ESP32 and run the new uploaded sketch.

Demonstration

After uploading the code, the LED connected to GPIO 23 should be blinking every other second.

Wrapping up

We hope you’ve found this getting started guide useful. The blinking LED is just a simple project to get you started with the ESP32. This is also a great way to learn the procedure you need to do to upload code to your board.
If you like ESP32, we have more than 20 projects with the ESP32 you can find in our repository of ESP32 projects:
Do you have any questions? Leave a comment down below!
Thanks for reading,

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