The esp32 devkit board GPIO (general purpose input/output): Esp32 Pinouts.
The ESP32 is a powerful and versatile microcontroller from Espressif Systems, known for its robust features including built-in Wi-Fi, Bluetooth, and numerous GPIO pins for interfacing with peripherals. Understanding the pinout of the ESP32 is essential for maximizing its capabilities in projects. Below is an overview of the ESP32's pinout:
ESP32 Pinout Overview
The ESP32 has various pins organized into categories based on their functionality. These include GPIO (General Purpose Input/Output), power, analogue, and special-function pins.
Key Pin Categories
Power Pins
- VIN/5V: Input power pin for external power (typically 5V)
- 3V3: Provides 3.3V output for powering external devices.
- GND: Ground pins for completing electrical circuits
GPIO Pins
- The ESP32 has 36 GPIO pins, most of which are multifunctional. Each pin can be configured as input, output, or for specific functions such as I2C, SPI, UART, ADC, or PWM.
- GPIO pins are grouped into two banks:
- GND: Ground pins for completing electrical circuits
Analog Pins
- ADC (Analog-to-Digital Converter):
- DAC (Digital-to-Analog Converter):
Special Pins
- UART Pins:
- SPI Pins:
- I2C Pins
- PWM Pins:
Other Special Pins
- EN (Enable): Used to reset the ESP32. Bringing it low will reset the chip
- BOOT (GPIO0): Held low during startup to enter the bootloader mode for programming the device.
- Touch Pins: ESP32 includes 10 capacitive touch-sensitive pins (GPIO4, GPIO13–GPIO15, GPIO27, GPIO32–GPIO33).
Strapping Pins
- Some GPIO pins are used for configuration at boot, known as strapping pins (e.g., GPIO0, GPIO2, GPIO12, GPIO15). Avoid using these for regular input/output in some configurations to prevent boot issues.
Important Considerations
- Voltage Tolerance:
- Current Limits
- Boot Configuration
- High-Frequency Signals
inconclusion
- The ESP32 pinout varies slightly between modules (e.g., ESP32-WROOM-32, ESP32-WROVER) and development boards (e.g., DevKitC). Always consult the datasheet and reference manual for specific pin assignments and usage guidelines.
