ESP32-PICO-KIT: Your All-in-One ESP32 Development Board
The ESP32-PICO-KIT is a compact and versatile development board featuring the integrated ESP32-PICO-D4 module, perfect for rapid prototyping of IoT projects.
The ESP32-PICO-KIT is a highly integrated development board designed by Espressif Systems, built around their ESP32-PICO-D4 System-in-Package (SiP). This module cleverly combines the powerful ESP32 dual-core processor, Wi-Fi and Bluetooth radios, flash memory, and an antenna into a single, compact component. This SiP approach significantly simplifies board design and reduces the overall footprint, making it ideal for space-constrained applications.
At its heart, the ESP32-PICO-D4 module is powered by the ESP32 chip, a low-power, high-performance SoC featuring two Tensilica Xtensa LX6 microprocessors. This dual-core architecture allows for efficient handling of demanding tasks, such as running complex applications while simultaneously managing wireless communication. The ESP32 is renowned for its robust Wi-Fi (802.11 b/g/n) and Bluetooth (v4.2 BR/EDR and BLE) capabilities, making it a go-to choice for connected projects.
Released around 2017, the ESP32-PICO-KIT was one of the early development boards to showcase the integrated ESP32-PICO-D4 module. It sits within Espressif's extensive family of ESP32 development boards, offering a more streamlined and compact alternative to boards like the popular ESP32-DevKitC. Its integrated nature makes it particularly appealing to makers and students who want a single, ready-to-use board without the need for external flash memory chips or complex antenna circuitry, enabling faster project development.
This board is well-suited for a wide range of makers, from beginners experimenting with IoT concepts to experienced embedded engineers looking for a compact platform for product development. Its ease of use, combined with the powerful features of the ESP32, makes it excellent for projects involving wireless sensors, home automation, smart devices, and wearable technology where size and integrated connectivity are key requirements.
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Specifications
| Microcontroller / SoC | ESP32-PICO-D4 (based on ESP32 chip) |
| Architecture | Dual-core Tensilica Xtensa LX6 |
| Clock speed | Up to 240 MHz |
| Flash / Storage | 4 MB integrated SPI flash |
| RAM / SRAM | 520 KB SRAM |
| Operating voltage | 3.3V |
| Digital I/O pins | 21 (shared with peripherals) |
| Analog / ADC | 12-bit ADC (up to 18 channels) |
| PWM | Yes (up to 16 channels) |
| Connectivity | Wi-Fi 802.11 b/g/n, Bluetooth v4.2 BR/EDR and BLE |
| USB | Micro-USB connector for power and programming (via onboard USB-to-UART bridge) |
| Power input | Micro-USB (5V) or 5V/VIN pin |
| Dimensions | 27.1mm x 17.9mm x 3.7mm (module); Board size varies, typically around 52mm x 25mm |
Pinout & pin functions
| Pin | Function |
|---|---|
| 3V3 | 3.3V Power Output |
| GND | Ground |
| EN | Enable Pin (active low) |
| VP | ADC1_CH0 (GPIO36) |
| VN | ADC1_CH3 (GPIO39) |
| ADC1_CH4 | ADC1_CH4 (GPIO34) |
| ADC1_CH6 | ADC1_CH6 (GPIO34) |
| ADC1_CH7 | ADC1_CH7 (GPIO35) |
| GPIO4 | GPIO4 |
| GPIO2 | GPIO2, also connected to Green LED |
| GPIO15 | GPIO15 |
| GPIO13 | GPIO13, also SPI MOSI |
| GPIO12 | GPIO12, also SPI MISO |
| GPIO14 | GPIO14, also SPI SCK |
| GPIO27 | GPIO27, also I2C SDA |
| GPIO26 | GPIO26, also I2C SCL |
| GPIO25 | GPIO25, also DAC |
| GPIO33 | GPIO33 |
| GPIO32 | GPIO32 |
| GPIO35 | GPIO35, also ADC1_CH7 |
| GPIO34 | GPIO34, also ADC1_CH6 |
| GPIO39 | GPIO39, also ADC1_CH3 |
| GPIO36 | GPIO36, also ADC1_CH0 |
| TXD0 | UART0 TXD (GPIO1) |
| RXD0 | UART0 RXD (GPIO3) |
| 5V/VIN | 5V Power Input (from USB or external supply) |
Wiring & circuit basics
Powering the ESP32-PICO-KIT is straightforward via its micro-USB port, which supplies a stable 5V. Alternatively, the 5V/VIN pin can accept an external 5V supply. The board features an onboard 3.3V voltage regulator, which supplies the ESP32-PICO-D4 module and any connected peripherals. It's crucial to ensure your power source can provide at least 500mA, especially when using Wi-Fi or Bluetooth, to prevent brownouts and ensure stable operation. Avoid applying voltages higher than 5V to the 5V/VIN pin, as this can damage the onboard regulator.
All GPIO pins on the ESP32-PICO-KIT operate at a logic level of 3.3V. This means you must be cautious when interfacing with 5V components. Connecting a 5V output directly to an ESP32 GPIO pin can cause permanent damage. For sensors or modules that output 5V logic, use a logic level shifter or a voltage divider (e.g., a simple resistor divider for digital inputs) to convert the signal to 3.3V. Conversely, if you need to control a 5V device (like a relay or LED requiring 5V), ensure the ESP32's 3.3V output is sufficient or use a transistor or MOSFET as a switch, driven by the 3.3V GPIO signal.
A common beginner project involves blinking an LED. Connect the longer leg (anode) of an LED to a GPIO pin, such as GPIO2 (which is also connected to the onboard LED). Connect the shorter leg (cathode) of the LED through a current-limiting resistor (typically 220-330 ohms for standard LEDs) to a GND pin. When the GPIO pin is set HIGH (3.3V), current flows through the LED and resistor, illuminating it. For an I2C sensor like a BME280, connect its VCC to the 3V3 pin, GND to a GND pin, SDA to GPIO27 (SDA), and SCL to GPIO26 (SCL).
Programming & getting started
The ESP32-PICO-KIT is highly versatile in its programming options. For beginners and rapid prototyping, the Arduino IDE is an excellent choice. After installing the ESP32 board support package, you can upload code via the micro-USB port using the onboard USB-to-UART bridge. MicroPython and CircuitPython also offer intuitive Python-based environments for the ESP32, allowing for quick development cycles. For more advanced applications and direct hardware control, Espressif's official ESP-IDF (Espressif IoT Development Framework) provides a powerful C/C++ SDK. PlatformIO, an integrated development environment for IoT, also offers robust support for the ESP32 family.
To upload your first sketch using the Arduino IDE: 1. Install the ESP32 board definitions in the Arduino IDE. 2. Select the 'ESP32-PICO-KIT' (or a compatible generic ESP32 board) from the Tools > Board menu. 3. Connect the ESP32-PICO-KIT to your computer via USB. 4. Select the correct COM port from the Tools > Port menu. 5. Write a simple sketch, like the 'Blink' example, modifying the pin number if necessary (e.g., to use the onboard LED on GPIO2). 6. Click the Upload button. The board will reset and begin executing your code.