1. Based on ESP8266
2. Arduino compatible, programming with Arduino B IDE
3. 11 * I/0 pin
4. 1 * ADC pin (input 0-3) 3V)
5. Support OTA online
6. Onboard 5V 1A Switching Power Supply (Maximum Input 24V)
So the operating level of I0 is 3.3V, which can instantly withstand 5V
Except for D0, all I0s support interrupts, PWM, I2C, and 1-wire. If you have previously developed ESP32 modules using Arduino IDE, you can skip this step. Because this board does not require additional configuration. Using the universal board type NodeMCU 1.0 (ESP-12E Module) from the ESP8266 module in the development board manager is sufficient.
