ESP-WROOM-32 ピン配置とデータシート | pdf

A beginner’s guide to ESP32 | Hardware & coding basics + Wi-Fi server demo

ESP-WROOM-32 is a handy Wi-Fi and Bluetooth combo module developed by Espressif, which has gained huge popularity among electronics enthusiasts in recent years. To put it simply, it’s like a small yet powerful “brain” for IoT projects. You just power it up, and it quickly connects to Wi-Fi or interacts with devices like phones and computers via Bluetooth.

ESP-WROOM-32 pinout

• Most GPIO pins on ESP-WROOM-32 can be configured as digital input/output, ADC input, PWM output, as well as special interfaces such as UART, SPI, and I²C.

• SENSOR_VP, SENSOR_VN, IO34, and IO35 are input-only GPIO pins.

• Special attention is needed for GPIO0, GPIO2, and EN pins regarding their states during boot-up and firmware flashing.

• ESP-WROOM-32 operates strictly on 3.3V. Supplying higher voltage may damage the module.

ESP-WROOM-32 power consumption

ESP-WROOM-32 has excellent power consumption performance, particularly in deep sleep mode, making it ideal for battery-powered applications.

ESP-WROOM-32 equivalent module

ESP-WROOM-32 wiring circuit example

Key Connections:

• 電源:
  A regulator (such as AMS1117-3.3) is used to convert a 5V input to 3.3V required by the ESP32 module.

• Enable Pin (EN):
  Connected through a pull-up resistor to 3.3V to ensure the module starts correctly.

• Boot Pin (IO0):
  Usually controlled by a button; used to enter firmware download mode.

• Reset Pin (EN):
  Connected to a reset button, allowing manual restart of the module.

• UART Communication (TXD0/RXD0):
  Connected to a USB-to-Serial converter chip (like CP2102) for programming and debugging communication.

• USB Interface:
  Provides power and serial communication capability.

ESP-WROOM-32 arduino code example

Here’s a quick example code for testing the Wi-Fi connection of the ESP-WROOM-32 module using the Arduino IDE.

#include <WiFi.h>

const char* ssid = “yourSSID”;
const char* password = “yourPASSWORD”;

void セットアップ() {
Serial.begin(115200);
delay(1000);

Serial.println(“Connecting to WiFi…”);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(“.”);
}

Serial.println(“”);
Serial.println(“WiFi connected!”);
Serial.print(“IP address: “);
Serial.println(WiFi.localIP());
}

void loop() {

}