ESP32 WiFi & Bluetooth Module - Getting Started Guide

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Handson Technology
User Guide
ESP32 - WiFi & Bluetooth SoC Module
Created by Espressif Systems, ESP32 is a low-cost, low-power system on a chip (SoC) series with Wi-Fi & dual-mode
Bluetooth capabilities! At its heart, there's a dual-core or single-core Tensilica Xtensa LX6 microprocessor with a
clock rate of up to 240MHz. ESP32 is highly integrated with built-in antenna switches, RF balun, power amplifier,
low-noise receive amplifier, filters, and power management modules. Engineered for mobile devices, wearable
electronics, and IoT applications, ESP32 achieves ultra-low power consumption through power saving features
including fine resolution clock gating, multiple power modes, and dynamic power scaling.
SKU: MDU-1067
Specifications:
 Main processor: Tensilica Xtensa 32-bit LX6.
 Wi-Fi: 802.11 b/g/n/e/i (802.11n @ 2.4 GHz up to 150 Mbit/s).
 Bluetooth: v4.2 BR/EDR and Bluetooth Low Energy (BLE).
 Performance: up to 600DMIPS.
 ROM: 448KB, for booting and core functions.
 SRAM: 520KiB, for data and instruction.

ESP32 Module Pinout:

Integrating ESP32 with Arduino IDE Environment :
The ESP32 is currently being integrated with the Arduino IDE just like it was done for the ESP8266. This
add-on for the Arduino IDE allows you to program the ESP32 using the Arduino IDE and its programming
language.
Let’s get started!
Installing Python 2.7.x
Having the latest Arduino IDE software installed from arduino.cc/en/Main/Software. Follow these next
instructions:
1) Go to Python website and download the 2.7.x version for Windows:
https://www.python.org/downloads
2) Open the file and follow the installation wizard
3) Choose the option “Install for all users”
4) In Customize Python 2.7.X, you must enable the last option “Add python.exe to Path”

Installing Git
Having Git is optional, but it’s easier to download an prepare everything through Git’s Bash. Follow these
next steps:
1) Download and install Git and Git GUI from git-scm.com (it may take a while depending on your
systems and network speed…)
2) Launch Git GUI and select the Clone Existing Repository option:
3) Then, select the source and destination:
 Source Location: https://github.com/espressif/arduino-esp32.git
 Target Directory: Your_Arduino_IDE_Folder_Path/hardware/espressif/esp32 (in author’s case,
it looks like: C:/Users/ruisantos/Documents/Programs/arduino/hardware/espressif/esp32)
 Press the “Clone” button
4) Open the folder: Your_Arduino_IDE_Folder_Path/hardware/espressif/esp32/tools

5) Open the “get.exe” file and wait for it to download/prepare the files
The above installation may take a while to complete depending on your computer systems and network
speed…
Testing the Installation
Plug your ESP32 dev board to your computer.
1) Open Arduino IDE
2) Select your board in Tools > Board menu (in author’s case it’s the ESP32 Dev Module)

3) Select the COM port
4) Open one of these examples under File > Examples > WiFi (ESP32) > WiFi Scan
5) To make your ESP32 go into downloading/uploading mode: hold the BOOT button and press the
EN button to reboot your ESP32
6) Press the Upload button in the Arduino IDE and wait a few seconds while the code compiles and
uploads to your board. If everything is correct this what you should see:

7) Open the Arduino IDE serial monitor at a baud rate of 115200 to see the WiFi networks available
near your ESP32:
This is a very basic tutorial that illustrates how to prepare your Arduino IDE for the ESP32 on a Windows
PC.

Simple Program to Run in Arduino IDE:
In this example, you’re going to connect an LED and a pushbutton to the ESP32. The code is very simple
when you hold the pushbutton down it turns the LED on and when you release it turns the LED off.
Assemble all the parts as in the schematics below:
Copy the following code to your Arduino IDE and upload it to your ESP32 Dev Module.
/*
* Handson Technology www.handsontec.com
* Ardino IDE Example: Arduino button with LED
*/
// constants won't change. They're used here to
// set pin numbers:
const int buttonPin = 4; // the number of the pushbutton pin
const int ledPin = 16; // the number of the LED pin
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}
void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:

digitalWrite(ledPin, HIGH);
} else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}
Refer to previous section on how to put the ESP32 into downloading/uploading mode. Once success upload
the sketch, pressing the pushbutton will turn on the LED, releasing the pushbutton will turn off the LED.
Web Resources:
 http://esp32.net/

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