How to Use ESP32 NodeMCU Modul WiFi Entwicklungsboard mit CP2102: Examples, Pinouts, and Specs

The ESP32 NodeMCU Modul WiFi Entwicklungsboard mit CP2102, manufactured by AZDelivery (Part ID: ESP32S Dev Kit C), is a powerful and versatile development board designed for Internet of Things (IoT) applications. It features the ESP32 chip, which integrates WiFi and Bluetooth capabilities, making it ideal for wireless communication projects. The board also includes a CP2102 USB-to-UART bridge, simplifying programming and serial communication with a computer.

• IoT devices and smart home automation
• Wireless sensor networks
• Remote data logging and monitoring
• Bluetooth-enabled applications
• Prototyping and development of WiFi/Bluetooth-based systems

The following table outlines the key technical details of the ESP32 NodeMCU Modul:

The ESP32 NodeMCU Modul has a total of 30 GPIO pins, which can be used for various purposes. Below is a table summarizing the key pins and their functions:

1. Powering the Board:

   • Connect the board to your computer using a micro-USB cable. This provides both power and a communication interface.
   • Alternatively, supply 5V to the VIN pin and connect GND to the ground of your power source.

2. Programming the Board:

   • Install the CP2102 USB-to-UART driver on your computer (if not already installed).
   • Use the Arduino IDE or ESP-IDF (Espressif IoT Development Framework) to write and upload code to the board.
   • Select the correct board type (ESP32 Dev Module) and COM port in the Arduino IDE.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other peripherals. Ensure that the voltage levels are compatible (3.3V logic).

4. Uploading Code:

   • Press and hold the BOOT button while uploading code to put the board in programming mode.
   • Release the BOOT button once the upload begins.

The following example demonstrates how to blink an LED connected to GPIO2:

// Define the GPIO pin where the LED is connected
const int ledPin = 2;

void setup() {
  // Set the LED pin as an output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Turn the LED on
  digitalWrite(ledPin, HIGH);
  delay(1000); // Wait for 1 second

  // Turn the LED off
  digitalWrite(ledPin, LOW);
  delay(1000); // Wait for 1 second
}

• Voltage Levels: Ensure that all connected peripherals operate at 3.3V logic levels to avoid damaging the board.
• Power Supply: If using power-hungry peripherals, consider using an external power source to avoid overloading the USB port.
• Boot Mode: Use the BOOT button for programming mode if the board does not automatically enter it.

1. Problem: The board is not detected by the computer.
   Solution:

   • Ensure the CP2102 driver is installed correctly.
   • Try a different USB cable or port.

2. Problem: Code upload fails with a timeout error.
   Solution:

   • Press and hold the BOOT button while uploading the code.
   • Check that the correct COM port and board type are selected in the Arduino IDE.

3. Problem: The board resets unexpectedly during operation.
   Solution:

   • Ensure the power supply is stable and sufficient.
   • Avoid drawing excessive current from the GPIO pins.

• Q: Can I use 5V sensors with the ESP32?
  A: Yes, but you will need a level shifter to convert 5V signals to 3.3V.

• Q: How do I enable deep sleep mode?
  A: Use the esp_deep_sleep_start() function in your code. Connect GPIO16 to the RST pin for wake-up functionality.

• Q: Can I use the ESP32 with a battery?
  A: Yes, connect a 3.7V LiPo battery to the VIN and GND pins. Use a voltage regulator if necessary.