● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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Upgraded 38-pin ESP32 development board featuring a modern USB Type-C port and the ultra-reliable CP2102 USB-to-serial chip. Offers extensive GPIO access for complex IoT, Wi-Fi, and Bluetooth projects.
Upgrade your IoT workflow with the modern standard. The ESP32 38-Pin Development Board takes the immense dual-core processing power of the standard ESP-WROOM-32 module and wraps it in a heavily updated, maker-friendly package. By ditching the fragile Micro-USB port in favor of a robust USB Type-C connector, this board ensures your cables plug in perfectly on the first try and withstands the physical wear and tear of daily prototyping.
Maximum I/O and Ultimate Stability Unlike standard 30-pin variants, this upgraded board breaks out 38 individual pins. This provides you with maximum access to the ESP32's internal peripherals, giving you more GPIOs, analog inputs (ADCs), capacitive touch pins, and power connections for complex builds. To make wiring simple, every pin function is cleanly printed directly on the bottom silkscreen.
Furthermore, cheap clone boards often use unstable USB-to-serial chips that cause driver nightmares. This board utilizes the premium Silicon Labs CP2102 chip. The CP2102 is renowned for its rock-solid driver stability across Windows, Mac, and Linux, ensuring your code uploads flawlessly without frustrating COM port errors.
Compact Dimensions for Breadboarding Despite the high pin count, the board maintains a highly efficient footprint, measuring exactly 51.0mm in length and 25.5mm in width. It features an onboard 3.3V low-dropout (LDO) voltage regulator, allowing you to easily power the 3.3V logic from a standard 5V USB source.
Core Module: ESP-WROOM-32 (Dual-core 32-bit Xtensa LX6 @ 240MHz)
Connectivity: 802.11 b/g/n Wi-Fi & Bluetooth v4.2 BR/EDR and BLE
Flash Memory: 4MB SPI Flash
USB Interface: USB Type-C
USB-to-Serial Chip: Silicon Labs CP2102
Pin Count: 38 Pins
Operating Voltage: 3.3V Logic (5V tolerant on VIN/5V pin only)
Dimensions: 51.0mm x 25.5mm
Smart Home Hubs: Creating a central MQTT broker or Home Assistant node that communicates with various Wi-Fi and Bluetooth sensors around the house.
Web Servers & Dashboards: Hosting an interactive webpage directly on the ESP32 to control relays, motors, or LED strips via your smartphone.
BLE Beacons & Tracking: Utilizing the Bluetooth Low Energy (BLE) capabilities to track the proximity of smartphones or Bluetooth tags.
Unlock New Capabilities (Project Evolution)
Real-Time Operating Systems: Move beyond basic Arduino sketches. The dual-core architecture of this board allows you to harness FreeRTOS (via the ESP-IDF framework) to run complex, multi-threaded applications where Wi-Fi networking and heavy sensor data processing occur simultaneously without blocking each other.
Package includes:
What is the difference between this 38-pin board and a 30-pin board? The 38-pin board breaks out more of the ESP32's internal connections, giving you access to additional GPIOs and extra ground/power pins, which is useful for larger projects.
Why is the USB Type-C port an upgrade? Type-C is the modern standard. It is reversible (plugs in either way), more physically durable than Micro-USB, and unifies your cable management on your workbench.
What is the CP2102 chip? The CP2102 by Silicon Labs is the rectangular chip behind the USB port. It translates the USB signals from your computer into serial UART signals the ESP32 can understand to upload code. It is highly regarded for driver stability.
Do I need to install drivers for the CP2102? Modern operating systems (Windows 10/11, macOS, Ubuntu) usually have the CP2102 drivers pre-installed. If not, they are freely available from the Silicon Labs website.
Does this board support both Wi-Fi and Bluetooth? Yes, the metallic ESP-WROOM-32 module contains the radio hardware to support 2.4GHz Wi-Fi as well as both Bluetooth Classic and Bluetooth Low Energy (BLE).
What are the exact dimensions of the board? It measures 51.0mm long by 25.5mm wide.
Will this fit into a standard breadboard? Yes, but because it is quite wide, it will likely cover all the holes on one side of the breadboard center line. It is recommended to straddle it across two separate breadboards if you need access to both sides simultaneously.
Where can I find the pinout diagram? The pin names (like P15, P2, RX, TX, GND) are clearly printed in white silkscreen on the entire bottom of the circuit board.
Can I program this with the Arduino IDE? Absolutely. Simply install the ESP32 board manager core in the Arduino IDE, select "ESP32 Dev Module," and you can code it using standard Arduino C++.
What is the operating logic voltage? The ESP32 operates entirely on 3.3V logic. Do not apply 5V directly to the GPIO pins, as it will destroy the chip.
How do I power the board? You can power it via the USB Type-C port (5V), or you can supply regulated 5V to the '5V' pin, or regulated 3.3V to the '3V3' pin.
What are the two buttons on the top? The button labeled 'EN' is the hardware Reset button. The button labeled 'BOOT' is used to manually put the chip into flashing mode.
Do I have to press the BOOT button every time I upload code? Usually, no. This board features an auto-reset circuit (using the two transistors near the CP2102) that automatically puts the ESP32 into programming mode.
How much Flash memory does it have? The standard ESP-WROOM-32 module contains 4MB of SPI flash memory for storing your programs and files.
Are there any pins I should NOT use? Yes. Pins connected to the internal SPI flash (usually marked CMD, CLK, SD0, SD1, SD2, SD3) are reserved for system use. Using them for external sensors will cause the board to crash.
Are the header pins pre-soldered? Yes, the board comes fully assembled with the male header pins already soldered into place, ready for breadboarding.
Can I connect a LiPo battery directly to this board? No, this specific board does not have a built-in battery charging circuit or a JST connector. You would need an external battery shield or regulator module to run it on LiPo power.
Does the ESP32 have analog inputs? Yes, it features multiple 12-bit ADC (Analog to Digital Converter) channels for reading variable voltages from sensors like potentiometers or light meters.
What is the clock speed of the processor? The dual-core processor can run at adjustable speeds up to 240MHz, making it significantly faster than an Arduino Uno.
Is the antenna built-in? Yes, the zig-zag pattern at the top of the silver ESP-WROOM-32 module is the integrated PCB trace antenna for Wi-Fi and Bluetooth.
| Technical Details |
|
|---|---|
| Core Chipset: | ESP32 |
| Flash Memory: | 4 MB |
| PSRAM: | NA |
| Wireless Connectivity: | WiFi, Bluetooth |
| Antenna Type: | Onboard PCB |
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
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