How to Use esp-pico-kit-v4: Examples, Pinouts, and Specs

Introduction

The ESP-PICO-KIT-V4 is a compact development board built around the ESP32-PICO-D4 system-on-chip (SoC). This SoC integrates Wi-Fi and Bluetooth capabilities, making it ideal for IoT (Internet of Things) applications. The board is designed for rapid prototyping and development, offering a small form factor, GPIO pins for interfacing with peripherals, USB connectivity for programming and debugging, and compatibility with a wide range of sensors and modules.

Explore Projects Built with esp-pico-kit-v4

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32-Based Smart Agriculture System with LoRa Communication

This circuit features an ESP32 Devkit V1 microcontroller as the central processing unit, interfacing with various sensors including a PH Meter, an NPK Soil Sensor, and a Soil Moisture Sensor for environmental data collection. It also includes an EBYTE LoRa E220 module for wireless communication. Power management is handled by a Step Up Boost Power Converter, which is connected to a 12V Battery, stepping up the voltage to power the ESP32 and sensors, with common ground connections throughout the circuit.

Open Project in Cirkit Designer

ESP32 and Logic Level Converter-Based Wi-Fi Controlled Interface

This circuit features an ESP32 Devkit V1 microcontroller connected to a Bi-Directional Logic Level Converter, which facilitates voltage level shifting between the ESP32 and external components. The ESP32 is powered through its VIN pin via an alligator clip cable, and the logic level converter is connected to various pins on the ESP32 to manage different voltage levels for communication.

Open Project in Cirkit Designer

Raspberry Pi Pico and ESP32 Wi-Fi Controlled Sensor Interface

This circuit integrates a Raspberry Pi Pico and an ESP32 Wroom Dev Kit, interconnected through various GPIO pins and resistors, to enable communication and control between the two microcontrollers. The ESP32 is powered by a 3.3V supply and shares ground with the Raspberry Pi Pico, while specific GPIO pins are used for data exchange. The provided code sketches for the Raspberry Pi Pico suggest a framework for further development of the system's functionality.

Open Project in Cirkit Designer

ESP32-Controlled Smart Relay System with Motion Detection and Manual Override

This circuit features an ESP32 Devkit V1 microcontroller connected to a 4-channel 5V relay module, multiple pushbuttons, a PIR motion sensor, and a green LED. The ESP32 controls the relay channels, which in turn can switch AC-powered devices (bulbs) connected via sockets. The pushbuttons and PIR sensor provide input signals to the ESP32, which can be programmed to respond to these inputs by toggling the state of the relays and the LED.

Open Project in Cirkit Designer

Common Applications and Use Cases

• IoT devices and smart home applications
• Wireless sensor networks
• Wearable electronics
• Industrial automation
• Prototyping Bluetooth and Wi-Fi-enabled devices

Technical Specifications

Key Technical Details

• Microcontroller: ESP32-PICO-D4 (dual-core Xtensa® 32-bit LX6 processor)
• Clock Speed: Up to 240 MHz
• Flash Memory: 4 MB (integrated in the ESP32-PICO-D4)
• RAM: 520 KB SRAM
• Wireless Connectivity:
  • Wi-Fi: 802.11 b/g/n
  • Bluetooth: v4.2 BR/EDR and BLE
• Operating Voltage: 3.3V
• USB Interface: Micro-USB for programming and power
• GPIO Pins: 20 (multiplexed for various functions)
• Dimensions: 52 mm x 20 mm

Pin Configuration and Descriptions

The ESP-PICO-KIT-V4 exposes 20 GPIO pins, which can be used for digital I/O, analog input, PWM, I2C, SPI, UART, and more. Below is the pinout description:

Usage Instructions

How to Use the ESP-PICO-KIT-V4 in a Circuit

1. Powering the Board:

   • Connect the board to your computer or a USB power source using a Micro-USB cable.
   • Ensure the power supply provides 5V via USB, which the onboard regulator converts to 3.3V.

2. Programming the Board:

   • Install the Arduino IDE or ESP-IDF for development.
   • Add the ESP32 board support package to the Arduino IDE via the Boards Manager.
   • Select "ESP32 Dev Module" as the board in the Arduino IDE.
   • Connect the board to your computer and select the appropriate COM port.

3. Connecting Peripherals:

   • Use jumper wires to connect sensors, actuators, or other modules to the GPIO pins.
   • Refer to the pin configuration table to determine the appropriate pins for your application.

4. Uploading Code:

   • Write your code in the Arduino IDE or ESP-IDF.
   • Press the "Upload" button in the IDE to flash the code to the board.
   • If the upload fails, hold down the "BOOT" button on the board while uploading.

Example Code for Arduino IDE

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

// Define the GPIO pin for the LED
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
}

Important Considerations and Best Practices

• Voltage Levels: Ensure all connected peripherals operate at 3.3V logic levels to avoid damaging the board.
• Boot Mode: GPIO0 must be pulled low during programming. This is handled automatically when using the onboard USB interface.
• Heat Management: The ESP32-PICO-D4 can get warm during operation. Ensure adequate ventilation if used in an enclosed space.

Troubleshooting and FAQs

Common Issues and Solutions

1. The board is not detected by the computer:

   • Ensure the USB cable is functional and supports data transfer.
   • Install the necessary USB-to-serial drivers (e.g., CP210x or CH340).

2. Code upload fails:

   • Check that the correct COM port is selected in the IDE.
   • Hold down the "BOOT" button while uploading the code.

3. Wi-Fi or Bluetooth is not working:

   • Verify that the correct SSID and password are used in your code for Wi-Fi.
   • Ensure no other devices are interfering with the Bluetooth connection.

4. The board overheats:

   • Reduce the clock speed in your code if possible.
   • Avoid running high-power tasks continuously without breaks.

FAQs

Q: Can I power the board using an external 3.3V source?
A: Yes, you can power the board via the 3V3 pin, but ensure the voltage is stable and does not exceed 3.3V.

Q: How do I reset the board?
A: Press the "EN" button on the board to reset it.

Q: Can I use the ESP-PICO-KIT-V4 with MicroPython?
A: Yes, the board supports MicroPython. You can flash the MicroPython firmware using tools like esptool.py.

Q: What is the maximum current output of the GPIO pins?
A: Each GPIO pin can source or sink up to 12 mA. Avoid exceeding this limit to prevent damage.