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Let’s Play with ESP-WROOM-32 on Arduino (Environment Construction Setup – LED Blinking)

DevicePlus Editorial Team
Published by DevicePlus Editorial Team at December 14, 2022
Categories
  • Arduino
Tags
ESP Wroom and LED

Originally published by Mar 27, 2020

This article was translated to English, and was originally published for deviceplus.jp.

ESP Wroom and LED

Table of Contents

    1. Today’s Electronic Recipe
  1. 1. What is ESP-WROOM-32?
  2. 2. Functions and Performance of ESP-WROOM-32
  3. 3. Set Up Environment Used in Arduino
      1. 3-1. Add ESP32 Board to Arduino IDE
      2. 3-2. Install Driver
      3. 3-3. Connect Board to PC
  4. 4. Write Program – LED Blinking
  5. Conclusion
  6. Related Articles

ESP-WROOM-02, which we have already covered several times in past articles, is an Arduino-compatible board popular because of its size and Wi-Fi support. In this article, we will describe the basic usage of ESP-WROOM-32, a successor released this spring, as well as the newly installed Bluetooth (BLE) function.

 

Today’s Electronic Recipe

Estimated time to complete: 60 minutes
Parts needed
・ESP-WROOM-32 development board
・LED

 

what esp wroom32 looks like

ESP-WROOM-32

 

1. What is ESP-WROOM-32?

ESP-WROOM-32 is a Wi-Fi module equipped with a chip called ESP32 provided by Espressif Systems and capable of Wi-Fi and Bluetooth (BLE) communication. It is slightly larger than ESP-WROOM-02, but it still is small. The module also has the advantage that Arduino programs can be written (that is, the module can be used as part of Arduino), Wi-Fi communication is supported, and the cost is lower.

 

2. Functions and Performance of ESP-WROOM-32

The table below shows a comparison of ESP-WROOM-32 and ESP-WROOM-02, the previous model.

two different types of esp wroom

ESP-WROOM-32 (left) | ESP-WROOM-02 (right)

 

ESP-WROOM-02 (ESP8266) ESP-WROOM-32 (ESP32)
Dimension 20 mm long x 18 mm wide 25.5 mm long x 18 mm wide
CPU Tensilica LX106 @ 80 / 160 MHz Tensilica Xtensa Dual-Core LX6 @ 160 / 240 MHz
RAM 36 KB available to user 520 KB
Flash memory 1, 2, 4, 8, 16 MB 64 MB
Wi-Fi 802.11n up to 65 Mbps,
802.11g up to 54 Mbps
802.11n up to 150 Mbps,
802.11g up to 54 Mbps,
802.11 b/g/n/d/e/i/k/r
Bluetooth – Bluetooth v4.2 BR/EDR and BLE specification
Number of pins 18 pins 38 pins
Power supply 3.0 to 3.6 V / 80 mA 2.2 to 3.6 V / 80 mA
Allowable operating temperature -4℉ to 257℉ -40℉ to 257℉

As a rough difference in features from ESP-WROOM-02, ESP-WROOM-32:

• A bit larger than ESP-WROOM-02
• Supports Bluetooth
• Higher performance in terms of CPU, RAM, Flash memory, etc.
• Has more pins
• Supports a wider range of power voltages

It is very helpful in actual work that the module has more pins and a wider range of power voltages, as well as the ability to support Bluetooth and show higher performance.

 

3. Set Up Environment Used in Arduino

Now let’s use ESP-WROOM-32 as Arduino. As with the ESP-WROOM-02, you can’t immediately start the Arduino IDE to write programs after connecting the board via USB. First, you need to build an environment to use it.

ESPr Developer 32 is used in this article, which is a development board that can be used immediately after connecting to USB without soldering. Any development board with ESP-WROOM-32 should do, but please make sure beforehand.

ESPr Developer 32

ESPr Developer 32

The following shows the main flow of environment construction (for Windows). Here’s the brief overview.

1. Add the ESP32 board to Arduino IDE
2. Install the driver
3. Connect the board to PC

 

3-1. Add ESP32 Board to Arduino IDE

First, you should add the board information so that ESP32 can be selected in “Tool”-“Board” in Arduino IDE.

Download the necessary files released on the following Github site:
Github webpage

Click the “Clone or download” button in the center right of the screen and select “Download ZIP”.

Download ZIP file

The content of the downloaded ZIP should be as follows.

files

For Windows, save these folders and files to the location where Arduino is installed, such as:

e.g.) C:\Program Files (x86)\Arduino\hardware\espressif\esp32\

Next, start tools/get.exe from among the saved files and download the necessary files.
select the file

Click to start get.exe. Then, the command prompt screen appears, starting to download the necessary files.

* The files are usually downloaded to the same location, but if they are downloaded to another location (such as under C:\Users\), move them under esp32\tools.

e.g.) C:\Program Files (x86)\Arduino\hardware\espressif\esp32\tools\

Now, the required files are ready.

 

3-2. Install Driver

Next, install the driver of the board. The driver is required to use USB UART, so download it from the following site.

* If you have used ESP-WROOM-02 in the past, skip this step as it may have already been installed.
Silicon labs webpage

When you open the above site, the drivers for each OS are available at the bottom of the page. Download and install one.

 

3-3. Connect Board to PC

When you have completed the above steps, connect the ESP-WROOM-32 board to your PC.
Connect developer board

When connected to the PC, the PWR LED lights red.
If the connection is recognized from “Tool”-“Serial Port” in Arduino IDE, then everything is set.

 

4. Write Program – LED Blinking

When you’re ready, write a program in Arduino IDE. For the LED blinking program, first open the “01.Basics”-“Blink” program from the sketch examples.
After opening the program, set the board to “ESP32 Dev Module” from “Tools” and write the program.

Once you’ve written the program, the LED blinking is successfully built.
(Since pin 13 is specified this time, the LED is connected to pin 13 and GND on ESPr Developer32.)

 

Conclusion

We have successfully set up to use ESP-WROOM-32. Next time, we’ll try Bluetooth communication.

 

Related Articles

Want to do more with your Arduino? Explore our guides to unlock exciting new capabilities:

  1. Using ESP-WROOM-02 Wifi Module As Arduino MCU
  2. Enter the Matrix, LED Matrix that is! Create your very own light up LED display with Arduino
  3. The Basics of Arduino: Adjusting LED Brightness
  4. Display characters with LEDs! How to use a matrix LED
  5. Let’s make a “Wake Up Alarm Clock” with ESP32 and RTC!
DevicePlus Editorial Team
DevicePlus Editorial Team

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