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Made a breakout board for ESPWroom02U Module,

Hey, what’s up, everyone? So here’s something useful: a custom breakout board for using the ESP-WROOM-02U module for tinkering and testing.

The ESP-WROOM-02U is an ESP8266EX-based microcontroller that offers the same features as its predecessor, the ESP Series, but is way smaller, making it suitable for implementing into a badge or wearable project.

Furthermore, the ESP-WROOM-02U integrates a U.FL connector for adding an external antenna for increasing the WiFi range, which is an eye-catching feature.

It comes in two variants, ESP-WROOM-02D and ESP-WROOM-02U, where 02D is without the U.FL connector and 02U comes with it.

For using this microcontroller, we need a breakout board of some sort for programming the board and using its I/O pins for controlling stuff.

So I prepared a simple carrier board that lets us program this MCU and interact with it.

This article is about the whole building process and how to use this module, so let’s get started.

Material required
Following are the materials used in this built-

- ESP-WROOM-02U Module
- Custom PCB
- 10K Resistor 0603 Package
- 1K Resistor 0805 Package
- BLUE LED 0805 Package
- RED LED 0805 Package
- SMD tactile switch
- Male Header Pins
- Female Header Pins
- nodemcu for programming

ESP-WROOM-02U is an ESP8266 chip-based microcontroller made by Espressif Systems. It comes under the category of 802.11 WiFi modules and is powered by an ESP8266EX, which is a Tensilica L106 32-bit RISC processor.

Its operating voltage is between 2.7 and 3.3 volts, and it works at a frequency of 2.4 to 2.5 GHz.

As for its average current, it consumes 80mA at least and 170mA max.

It has 11 GPIO pins that can be used as regular I/O pins.

As for its working, we can easily use this in place of regular ESP12F modules. Its specs are similar to those of ESP12F modules; the only difference is the size, which is way smaller and more compact.”

Link to article