How to Use ESP32 MakerPico: Examples, Pinouts, and Specs

The ESP32 MakerPico is a compact and versatile development board built around the ESP32 microcontroller. It features integrated Wi-Fi and Bluetooth capabilities, making it an excellent choice for IoT (Internet of Things) applications. The board is designed for rapid prototyping and supports a wide range of sensors, modules, and peripherals. Its small form factor and robust feature set make it ideal for projects requiring wireless communication, data processing, and control.

• IoT devices and smart home automation
• Wireless sensor networks
• Remote monitoring and control systems
• Wearable devices
• Robotics and automation
• Educational projects and prototyping

• Microcontroller: ESP32 dual-core processor
• Clock Speed: Up to 240 MHz
• Flash Memory: 4 MB
• SRAM: 520 KB
• Connectivity: Wi-Fi (802.11 b/g/n), Bluetooth 4.2 (Classic and BLE)
• Operating Voltage: 3.3V
• Input Voltage Range: 5V (via USB-C)
• GPIO Pins: 20 (configurable as digital I/O, PWM, I2C, SPI, UART, etc.)
• ADC Channels: 12-bit resolution, up to 18 channels
• DAC Channels: 2 (8-bit resolution)
• Interfaces: I2C, SPI, UART, PWM, ADC, DAC
• USB Interface: USB-C for power and programming
• Dimensions: 51mm x 21mm

The ESP32 MakerPico features a total of 20 GPIO pins, which are multifunctional and can be configured for various purposes. Below is the pinout description:

1. Powering the Board:

   • Connect the board to a computer or power source using a USB-C cable.
   • Alternatively, supply 5V to the VIN pin for external power.

2. Programming the Board:

   • Install the ESP32 board package in the Arduino IDE or use the ESP-IDF framework.
   • Select "ESP32 Dev Module" as the board in the Arduino IDE.
   • Connect the board to your computer and upload your code.

3. Connecting Peripherals:

   • Use the GPIO pins to connect sensors, actuators, or other modules.
   • Ensure that the voltage levels of connected devices are compatible with the 3.3V logic of the ESP32.

4. Wireless Communication:

   • Use the built-in Wi-Fi and Bluetooth capabilities for wireless data transmission.
   • Configure the network settings in your code to connect to a Wi-Fi network or pair with Bluetooth devices.

• Avoid supplying more than 3.3V to the GPIO pins to prevent damage to the board.
• Use level shifters when interfacing with 5V devices.
• Ensure proper grounding when connecting external components.
• Use decoupling capacitors for stable power supply to sensitive components.
• When using ADC pins, note that the input voltage range is 0-3.3V.

Below is an example of using the ESP32 MakerPico to read data from a DHT11 temperature and humidity sensor and send it to a serial monitor:

#include <WiFi.h>
#include <DHT.h>

// Define DHT sensor type and pin
#define DHTPIN 4  // GPIO4 is connected to the DHT sensor
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);  // Initialize serial communication
  dht.begin();           // Initialize the DHT sensor
  Serial.println("DHT11 Sensor Test");
}

void loop() {
  delay(2000);  // Wait 2 seconds between readings

  // Read temperature and humidity values
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if readings are valid
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Print the readings to the serial monitor
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("%  Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");
}

1. Board Not Detected by Computer:

   • Ensure the USB-C cable is a data cable, not just a charging cable.
   • Check if the correct COM port is selected in the Arduino IDE.

2. Code Upload Fails:

   • Verify that the correct board and port are selected in the IDE.
   • Press and hold the "BOOT" button on the board while uploading the code.

3. Wi-Fi Connection Issues:

   • Double-check the SSID and password in your code.
   • Ensure the Wi-Fi network is within range and operational.

4. GPIO Pin Malfunction:

   • Confirm that the pin is not being used for another function (e.g., boot mode).
   • Check for short circuits or incorrect wiring.

• Can I power the ESP32 MakerPico with a battery?
  Yes, you can use a 3.7V LiPo battery with a suitable voltage regulator or connect a 5V source to the VIN pin.

• What is the maximum current output of the 3.3V pin?
  The 3.3V pin can supply up to 500mA, depending on the input power source.

• Does the board support OTA (Over-The-Air) updates?
  Yes, the ESP32 MakerPico supports OTA updates for wireless firmware uploads.

• Can I use the board with MicroPython?
  Yes, the ESP32 MakerPico is compatible with MicroPython. You can flash the MicroPython firmware to the board and use it for development.