NodeMCU-32S ESP-32S WiFi Bluetooth Development Board

Product Overview

• Core Module: ESP‑WROOM‑32 (dual‑core Xtensa LX6, 240 MHz max)
• Connectivity: Wi‑Fi (802.11 b/g/n), Bluetooth Classic + BLE
• Memory: 520 KB SRAM, 4 MB Flash
• Interfaces: 34 GPIOs, ADC, DAC, SPI, I²C, UART, PWM, touch sensors
• USB Interface: Micro‑USB for power and programming
• Voltage: 3.3 V logic (5 V tolerant via onboard regulator)

Pinout Diagram

Setup Instructions

1. Install Arduino IDE
   • Download from Arduino.cc.
   • Add ESP32 board support: File → Preferences → Additional Board Manager URLs → https://dl.espressif.com/dl/package_esp32_index.json
2. Select Board
   • Tools → Board → ESP32 Arduino → NodeMCU‑32S
3. Drivers
   • Install CP2102/CH340 USB‑to‑UART drivers (depending on your board revision).
4. Power
   • Connect via Micro‑USB (5 V input, onboard regulator outputs 3.3 V).

Example Code

Blink onboard LED (GPIO2):

void setup() {
  pinMode(2, OUTPUT);
}

void loop() {
  digitalWrite(2, HIGH);
  delay(1000);
  digitalWrite(2, LOW);
  delay(1000);
}

Upload via Arduino IDE → Upload button.

Key Pin Functions

Risks & Best Practices

• Voltage caution: GPIOs are 3.3 V only (avoid 5 V direct input).
• Boot strapping pins: GPIO0, GPIO2, GPIO15 affect boot mode—avoid using them for peripherals unless necessary.
• Power stability: Use a stable 5 V supply; brownouts cause resets.
• Heat: ESP32 can run hot under load; ensure ventilation.

Applications

• IoT sensors (Wi‑Fi + BLE)
• Smart home automation
• Robotics (motor drivers via PWM)
• Audio streaming (I²S DAC)
• Educational kits for embedded systems