The ESP32-S Expansion Board (38-Pin) is a versatile baseboard designed for easy interfacing and reliable operation of ESP32-S development modules. It provides complete access to all I/O pins via male header rows, each paired with power and ground pins for effortless connections to sensors, modules, and peripherals. With support for three power input methods — USB Micro-B, USB Type-C, or 6.5V–16V DC jack — it offers flexible powering options and built-in reverse current protection for safety. A convenient JUMP selector allows switching between 3.3V and 5V power rails depending on your project needs. Compact, durable, and clearly labeled, this board simplifies prototyping and makes ESP32-based projects more organized and efficient. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Full I/O Expansion: Brings all 38 ESP32-S pins to labeled headers for easy prototyping.
Multiple Power Inputs: Choose from USB Micro-B, USB-C, or 6.5–16V DC power jack.
Selectable Power Rails: JUMP jumper lets you switch between 3.3V and 5V.
Reverse Current Protection: Prevents backflow during multi-source power usage.
Signal + Power + GND Layout: Each I/O pin has dedicated power and ground lines for convenience.
Compatible with All 38-Pin ESP32-S Modules: Fits both 0.9" and 1.0" width variants.
On-Board Power Indicator LED: Quickly verify power status.
Independent 3.3V and 5V Headers: Provides both regulated outputs for external devices.
Extra I2C/UART Header Block: Quick access to TX/RX and SDA/SCL pins.
Mounting Support: Includes four M4 holes for secure installation.
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Applications:
Prototyping: Rapidly connect sensors, actuators, and peripherals.
IoT Development: Simplifies connection for WiFi and Bluetooth-based projects.
Educational Projects: Ideal for learning microcontroller interfacing and power management.
DIY Electronics: Provides stable base for custom ESP32 projects.
Embedded System Design: Useful for quick testing and circuit development.
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| General Specifications |
| Compatibility | 38-Pin ESP32-S Modules (0.9" & 1.0" width) |
| Power Input Options | USB Micro-B / USB Type-C / 6.5–16V DC Jack |
| 5V Power Regulation | On-board linear regulator |
| 3.3V Source | ESP32’s onboard 3.3V regulator |
| Voltage Selector Jumper | 3.3V or 5V output rail |
| Indicators | Power LED (Red) |
| Protection Features | Reverse current protection diodes |
| I/O Layout | Header pins for each signal with power & GND |
| Additional Headers | TX/RX, SDA/SCL (I2C) |
| Mounting Holes | 4 × M4 holes |
| Board Dimensions (L×W) | 77mm × 54mm (3″ × 2.13″) |
| Input Voltage Range (DC Jack) | 6.5V – 16V (Recommended ≤12V) |
| Country of Origin | China |
| Shipment Weight | 0.04 kg |
| Shipment Dimensions | 8 × 6 × 2 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
OUR EVALUATION RESULTS:
This expansion board works with 38-pin ESP32 modules in either the narrower 0.9” or wider 1.0” configurations.
It provides flexibility in how the ESP32 is powered and also provides header pins on all I/O pins along with power and grounds to easily make jumper connections such as to sensor modules.
The board provides 3 ways to power the ESP32. It accepts either a USB Micro-B or USB C cable or can be powered from a standard DC Power jack. The DC power jack accepts 6.5V to 16V as input. It is recommended to keep the input down to a maximum of 12V to limit power dissipation in the on-board 5V linear regulator. Only one of these three DC power inputs should be connected at a time. A red LED lights when power is applied.
Baseboard 5V Power – If powered from USB, the 5V power comes straight from the USB after passing through a reverse current protection diode. If powered from the DC power jack, an on-board 5V regulator provides the 5V power.
Baseboard 3.3V Power – The 3.3V power on the baseboard is provided by the 3.3V regulator on the ESP32 module. Typically, the current drawn off this regulator should not exceed 250mA.
A USB Micro-B cable connected directly to the ESP32 will also power the expansion board. There are reverse current protection diodes in place both on the ESP32 and the baseboard, so it is safe to connect to the ESP32 USB, such as to reprogram it or monitor the serial output, while the baseboard is also powered by one of the 3 input power sources.
The board itself provides Signal/Power/Ground header pins for each of the ESP32 signal pins. This can be handy when connecting sensor modules or similar that also require power to be connected.
A jumper on the baseboard cleverly labeled JUMP selects whether 3.3V or 5V is applied to the power rails. Since the ESP32 is a 3.3V logic level compatible only device, this jumper should normally be left in the 3.3V position.
A separate header block brings out both 3.3V and 5V as well as GND. These are independent of the jumper position.
Another header block brings out the TX/RX and I2C SDA/SCL (D21/D22) as well as power and ground. This VCC voltage will change based upon the JUMP jumper position.
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Package Includes:
1 x ESP32-S Expansion Board 38-Pin
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