Welcome to our repository of ESP32 micro controller. The ESP32 is the ESP8266 successor loaded with lots of new features. The ESP32 is a development board that combines Wi-Fi and Bluetooth wireless capabilities, and it’s dual core. It supports a wide variety of peripherals such as: capacitive touch, ADC, DAC, I2C, SPI, UART, I2S, PWM and much more. It is one of the best solutions for DIY Internet of Things Projects and Smart Home Projects.

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:

Suggested Reading

ESP32 is a great tool for people of all skill levels. However, you will have a much better time learning along side your Arduino if you understand some Sensors, Modules, Display that can be use with Arduino. We recommend that you have at least a decent understanding of these concepts before you dive in to the wonderful world of Arduino.

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.

Specifications – ESP32 DEVKIT V1 DOIT

Number of cores 2 (dual core)
Wi-Fi 2.4 GHz up to 150 Mbits/s
Bluetooth BLE (Bluetooth Low Energy) and legacy Bluetooth
Architecture 32 bits
Clock frequency Up to 240 MHz
RAM 512 KB
Pins 30 or 36 (depends on the model)
Peripherals Capacitive touch, ADC (analog to digital converter), DAC (digital to analog converter), I2C (Inter-Integrated Circuit), UART (universal asynchronous receiver/transmitter), CAN 2.0 (Controller Area Netwokr), SPI (Serial Peripheral Interface), I2S (Integrated Inter-IC Sound), RMII (Reduced Media-Independent Interface), PWM (pulse width modulation), and more.

Programming Environments

The ESP32 can be programmed in different programming environments. You can use:
  • Arduino IDE
  • Espressif IDF (IoT Development Framework)
  • Micropython
  • JavaScript
  • LUA
In our projects, we program the ESP32 mainly with Arduino IDE or MicroPython.

ESP32 Pinout Guide

The ESP32 has more GPIOs with more functionalities compared to the ESP826. 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. 
const int ledPin = 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. 
Failed to connect to ESP32: Timed out... Connecting...
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. After uploading the code, the LED connected to GPIO 23 should be blinking every other second.
   

ESP32 / ESP8266 Projects