In addition to the ESP32 IC, the ESP-WROOM-32 also contain a 4 MB SPI Flash IC, a 40 MHz Crystal Oscillator, PCB Antenna and some discrete passive components to make a working system. One popular version of such module board is called ESP-WROOM-32. So, what Espressif Systems (the developers of ESP32) did is, they took the ESP32 IC and made a small module board with edge castellations. Since it is a QFN (Quad Flat No Leads) package, it is difficult solder the IC on to the PCB, if you are interested in making an ESP32 Board by yourself. The ESP32 Microcontroller IC is available in a 48-pin QFN package.

Hence, it is important to understand the pinout of popular ESP32 boards so that you will know what pins are available for use in projects. So, some of the GPIO Pins (6 to be specific) are connected to SPI Flash IC and those pins cannot be used as regular GPIO Pins. We know that all ESP32 boards come with 4 MB of Flash Memory to store the programs. Also, not all pins of the ESP32 Microcontroller SoC will be available on a development board as some pins might be permanently tied to a dedicated function. Why do we need to learn ESP32 Pinout?ĮSP32 based boards come in a variety of shapes and sizes and pinout of each board is different to other.

We will also learn about some important peripherals of ESP32 Microcontroller and their associated pins, what GPIO pins can be used in your project. The 30-pin ESP32 Development Board will be used to demonstrate the ESP32 Pinout. In this tutorial, we will learn about the pinout information of ESP32.

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