ESP32 WROOM 4Mb Devkit V1 Board with WiFi, Bluetooth, and Dual-Core processor

You can find the USB-C version here.

The ESP32 development board is ideal for IoT (Internet Of Things) projects because it has on-board WiFi and Bluetooth. Easy to program via the Arduino IDE. Watch the YouTube video above for instructions on installing this board in the Arduino IDE.

This ESP32 module is also suitable for WLED.

Use the OTRONIC ESP32 manual to quickly get started with your ESP32 Devkit V1 board.

NOTE: This ESP32 Devkit V1 does NOT fit on a standard breadboard. The ESP32-S DOES fit on a standard breadboard.

This ESP32 board has:

• 18 Analog-to-Digital Converter (ADC) channels
• 3 SPI interfaces
• 3 UART interfaces
• 2 I2C interfaces
• 16 PWM output channels
• 2 Digital-to-Analog Converters (DAC)
• 2 I2S interfaces
• 10 Capacitive sensing GPIOs

ESP32 Wroom32 DevKit has a total of 25 GPIOs, some of which can only be used as inputs.

ESP32 voltage VIN or USB:
The power supply for the ESP32 DevKit V1 is provided via the built-in Micro USB connector (5V) or directly via the "VIN" pin. The ESP32 can operate on an external power supply of 6 to 20 volts. If you use more than 12V, the voltage regulator can become very hot and will shorten its lifespan. In that case, it is better to use a STEP DOWN converter to reduce the voltage.

Input Only Pins
GPIO 34
GPIO 35
GPIO 36
GPIO 39
Not all pins have input pullup, you need external pullup on these pins when using as input pullup.

Not all pins have an input pullup and you will need to place an external pullup resistor. Below is an overview.

Pins with internal pull up INPUT_PULLUP
GPIO14
GPIO16
GPIO17
GPIO18
GPIO19
GPIO21
GPIO22
GPIO23

Pins without internal pull up
GPIO13
GPIO25
GPIO26
GPIO27
GPIO32
GPIO33

The nice thing about this board is that you can use it in multiple ways when it comes to WiFi communication.

1. As a mini access point
2. As a WiFi client
3. As a Web server
4. Peer-to-peer with ESP Now

We would like to explain the last one a bit further. ESP NOW is a technology that makes it possible for modules to communicate directly with each other via their MAC address. It also sends a message back indicating whether the data has been received, allowing good verification of whether messages arrive and can be validated.

With ESP Now you can work very modularly and it is also extremely fast. In this way, you can run your program on one ESP32 while your other ESP32 boards only respond and, as it were, act as an extension of your GPIO pins.

1 ESP32 can communicate with up to 20 other boards.

A good explanation of ESP NOW by Andreas Spiess can be found here: https://www.youtube.com/watch?v=6NsBN42B80Q

Delivery:
Header pins already soldered. Ready to use.

Installing ESP32 in Arduino IDE

To be able to program the ESP32 in the Arduino IDE, a few things must first be set up:

1. Install Arduino IDE software (www.arduino.cc)
2. In Arduino IDE, go to FILE and then to PREFERENCES.
3. Enter the following URL under MORE BOARD MANAGER URLS: https://dl.espressif.com/dl/package_esp32_index.json
4. Now go to TOOLS, BOARD and BOARD MANAGER
5. Search for the correct library (ESP32 by Espressif Systems) and install it (this only needs to be done once)
6. Select the board DOIT ESP32 Devkit V1 from the list under TOOLS, BOARD
7. Set the upload speed to 115200 baud
8. Set the port to the correct COM port

ESP32 does not work or does not work properly See the solutions below.

Uploading code to ESP32 does not work or shows the message A fatal error occurred: Failed to connect to ESP32: Timed out Connecting

If you notice during uploading that nothing happens, you can briefly hold down the BOOT button on the ESP32 board during uploading. As soon as the upload starts, you can release it again. This is a matter of finding the right moment.

ESP32 has no COM port in Arduino IDE

If no COM port is available in the Arduino IDE under TOOLS -> PORT, the CP210x driver may need to be reinstalled. This is the USB chip on this board. Search Google or download the driver here: https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers

It may also be due to the micro USB cable, which may not be a data cable. There are many so-called charging cables in circulation that are only suitable for charging, for example, a phone. Replace the cable with a suitable micro USB data cable or order a suitable cable at otronic.nl.

ESP32 Serial monitor does not work or shows strange characters in Arduino IDE

Set the baud rate in the Serial Monitor window at the bottom right to 115200 baud.

ESP32 GPIO pins do not match the pins in the code

The GPIO pins on ESP development boards do not always correspond to the values printed on the boards. Therefore, it is important to always consult the correct PINOUT diagram. You can find this, among other places, in the OTRONIC ESP32 Quick Start Guide

Dimensions
Length: 5.23cm
Width: 2.82cm
Height: 1.33cm