ESP32 boards are available in many different shapes and sizes. Three common formats are full-size ESP32 DevKit boards, D1 Mini ESP32 boards and Seeed Studio XIAO ESP32 modules. They may use related ESP32 chip families, but the board format can make a big difference in how easy they are to use in a project.
This article compares ESP32 DevKit, D1 Mini ESP32 and XIAO ESP32-style boards from a practical hardware point of view. The goal is to help choose the right board format, not only the right ESP32 chip.
Same Family, Different Board Styles
The ESP32 name describes a family of Espressif microcontrollers, not one single board. A classic ESP32 DevKit, a D1 Mini ESP32 and a XIAO ESP32 can all be ESP32-based boards, but they differ in size, pinout, connector style, power handling and project fit.
- ESP32 DevKit: larger development board with many exposed pins
- D1 Mini ESP32: compact board inspired by the popular Wemos D1 Mini format
- XIAO ESP32: very small module format available with several ESP32 variants
Choosing between them is often not about which one is “better.” It is about which shape, pinout and feature set fits the project best.
ESP32 DevKit: Full-Size Development Board
ESP32 DevKit boards are among the most common ESP32 development boards. They usually expose many GPIO pins and provide a convenient USB interface for programming and serial communication.
- Larger board size
- Many pins exposed on headers
- Usually includes USB-to-serial interface
- Commonly uses ESP-WROOM-style modules on classic versions
- Good for breadboard experiments and development work
- Often used as the reference format for shields and carrier boards
The ESP32 DevKit format is useful when a project needs many I/O pins or when easy access to signals is more important than small size.
D1 Mini ESP32: Compact and Familiar
The D1 Mini ESP32 format is inspired by the popular ESP8266 D1 Mini board style. It is smaller than most ESP32 DevKit boards and is often used when a compact module with onboard USB is desired.
- Compact board format
- Usually includes USB programming
- Smaller than a typical ESP32 DevKit
- Can fit into compact projects more easily
- Often attractive for users familiar with D1 Mini ESP8266 boards
- Pinout depends on the exact manufacturer and version
The D1 Mini ESP32 format can be a convenient middle ground: smaller than a full DevKit, but still easy to handle and program.
XIAO ESP32: Very Small ESP32 Modules
Seeed Studio XIAO ESP32 boards place ESP32-family chips into the tiny XIAO module format. XIAO boards are much smaller than typical DevKit boards and are useful in compact embedded projects.
- Very small board size
- Usually USB-C on modern versions
- Available with different ESP32 variants
- Good for compact finished devices
- Useful for wearable, portable and space-limited projects
- Fewer exposed pins than larger development boards
XIAO ESP32 boards are especially useful when the project needs wireless capability in the smallest practical board format.
Common XIAO ESP32 Variants
The XIAO format is available with several ESP32 variants. The exact wireless features depend on the selected chip.
- XIAO ESP32-C3: compact 2.4 GHz WiFi and Bluetooth LE board
- XIAO ESP32-S3: more powerful ESP32 board, useful for larger wireless projects
- XIAO ESP32-C6: 2.4 GHz WiFi 6, Bluetooth LE, Zigbee and Thread support
- XIAO ESP32-C5: dual-band 2.4 GHz / 5 GHz WiFi 6 and Bluetooth LE
This makes XIAO ESP32 boards flexible, but it also means the name “XIAO ESP32” is not specific enough by itself. Always check the exact version.
Main Board Format Comparison
| Feature | ESP32 DevKit | D1 Mini ESP32 | XIAO ESP32 |
|---|---|---|---|
| Board size | Largest of the three | Compact | Very small |
| Typical use | Development, prototyping, carrier boards, projects needing many pins | Compact WiFi projects, D1 Mini-style builds, smaller prototypes | Tiny embedded projects, wearables, portable devices, compact wireless modules |
| Exposed GPIO count | Usually highest | Medium, depends on board | Lower, because of very small size |
| USB programming | Usually yes | Usually yes | Yes on most XIAO boards |
| Breadboard use | Possible, but some boards are wide and block many rows | Usually easier than full DevKit | Possible, very compact |
| Best for final products | Good when many pins or a carrier board are needed | Good for compact projects | Excellent when size matters |
| Best for beginners | Good, because pins are easier to access | Good, if pinout is clearly documented | Good, but small size can make wiring tighter |
| Main advantage | Many pins and easy access | Compact but still convenient | Very small, modern and available with multiple ESP32 variants |
| Main limitation | Larger size | Pinout and compatibility vary by manufacturer | Fewer exposed pins and less physical space for wiring |
Board Size and Mounting
Board size is often the first practical difference. A full ESP32 DevKit is comfortable on the workbench, but it may be too large for a small finished device. A XIAO ESP32 module is tiny, but its small size also means fewer pins and less space for labels, headers and connectors.
- Use ESP32 DevKit when space is not a problem
- Use D1 Mini ESP32 when a compact but still easy-to-handle board is needed
- Use XIAO ESP32 when the project must be as small as possible
For early development, a larger board can be easier. For the final build, a smaller board may be more practical.
Compatibility with accessories
Due to the different board sizes, pin counts and pin row distances, not every ESP32 board will fit any accessory offered for ESP32 modules. For example, the CANADUINO Screw Terminal Adapter for ESP32 modules only supports boards with a pin row distance of 22.86, 27.94 and 33.02 mm.
Pin Count and Accessibility
The more compact the board, the fewer pins are usually exposed. This does not always mean the microcontroller has fewer features. It often means the small board simply cannot bring every signal to a header.
| Pin Access Need | Best Format | Reason |
|---|---|---|
| Many GPIO pins required | ESP32 DevKit | Usually exposes the most pins |
| A few sensors and one display | D1 Mini ESP32 or XIAO ESP32 | Compact boards usually have enough pins for simple I2C/SPI projects |
| Carrier board or PLC-style module | Depends on the carrier design | The exact pinout must match the carrier board |
| Smallest possible project | XIAO ESP32 | Very compact module size |
Pin accessibility matters during troubleshooting too. Larger boards often make it easier to clip probes, jumper wires and logic analyzer leads onto signals.
Important: Similar Shape Does Not Mean Pin Compatibility
ESP32 board formats can be confusing because some boards look very similar but are not pin-compatible. This is especially important with DevKit-style modules and carrier boards.
A board designed for one ESP32 module should not automatically be assumed to work with another module just because the board shape looks similar. Power pins, GPIO assignments, bootstrapping pins and special-function pins may differ.
- Always check the exact board pinout
- Do not rely only on physical appearance
- Do not assume ESP32-C5 and ESP32-C6 DevKit boards are interchangeable
- Carrier boards and PLC-style modules require the correct module pinout
- Shields and adapters should list the exact compatible board version
For example, an ESP32 PLC carrier designed specifically for an ESP32-C6 DevKit should use the specified ESP32-C6 module. A similar-looking ESP32-C5 DevKit should not be treated as a drop-in replacement unless the pinout has been checked and confirmed.
USB Connector and Programming
Most ESP32 DevKit, D1 Mini ESP32 and XIAO ESP32 boards include onboard USB for programming. The connector type depends on the board version.
- Older boards may use Micro-USB
- Newer boards often use USB-C
- Some boards use a USB-to-serial chip
- Some newer ESP32 variants support native USB or USB serial/JTAG
For normal Arduino IDE use, all three formats can be convenient. The most common problems are usually driver installation, wrong board selection, bad USB cables or insufficient power.
Power Supply Differences
All ESP32 boards require stable 3.3V power internally. Development boards usually include an onboard regulator so they can be powered from USB or a suitable voltage input pin. The quality and capacity of that regulator depends on the board.
- WiFi transmission can cause short current peaks
- Weak USB cables can cause brownout resets
- Small boards may have smaller regulators
- External loads should not be powered from the ESP32 board unless the board is designed for it
- For reliable projects, use a proper power supply with enough current capacity
Small board size does not mean small current peaks. Even tiny ESP32 modules can draw significant current during WiFi activity.
3.3V Logic
ESP32 GPIO pins use 3.3V logic. This applies to ESP32 DevKit boards, D1 Mini ESP32 boards and XIAO ESP32 boards.
- Do not treat ESP32 GPIO as 5V Arduino pins
- Use level shifting when connecting to 5V logic
- Use external drivers for relays, motors, solenoids and high-current LEDs
- Check whether connected sensors and displays are 3.3V compatible
This is especially important when converting older Arduino UNO projects to ESP32.
ESP32 DevKit Advantages
- Many pins exposed
- Easy to use on the workbench
- Good for experimenting and debugging
- Often used as a basis for carrier boards
- More physical space for labels and connections
ESP32 DevKit boards are often the best choice for development, learning and larger prototypes.
D1 Mini ESP32 Advantages
- Smaller than most DevKit boards
- Still easy to program through USB
- Convenient for compact WiFi projects
- Familiar format for users who already used D1 Mini ESP8266 boards
- Good balance between size and usability
D1 Mini ESP32 boards are useful when a full DevKit is too large but a very tiny XIAO module is not necessary.
XIAO ESP32 Advantages
- Very small board size
- Modern USB-C connector on many versions
- Available with several ESP32 variants
- Good for portable and embedded projects
- Useful in compact modular systems
XIAO ESP32 modules are often the best option when the project needs wireless capability in a very small footprint.
Choosing by Project Type
| Project Type | Recommended Format | Reason |
|---|---|---|
| Learning ESP32 basics | ESP32 DevKit | More pins and easier access for experiments |
| Breadboard prototype with many wires | ESP32 DevKit | Larger layout is easier to connect and troubleshoot |
| Compact WiFi sensor | D1 Mini ESP32 or XIAO ESP32 | Both are smaller than full DevKit boards |
| Small finished device | XIAO ESP32 | Very small and easy to fit into compact enclosures |
| PLC-style carrier board | Exact specified DevKit module | Carrier board pinout must match the module exactly |
| Smart-home Thread or Zigbee experiment | ESP32-C6 or ESP32-C5 board, depending on required features | Chip capability matters more than board size here |
| 5 GHz WiFi project | ESP32-C5 board | ESP32-C5 supports dual-band WiFi 6 |
Board Format vs Chip Variant
It is important to separate the board format from the ESP32 chip variant.
A board format describes the physical module style. A chip variant describes the actual ESP32 family member and wireless features. For example, a XIAO ESP32-C3 and a XIAO ESP32-C6 may look similar, but their wireless capabilities are different. A DevKit-style ESP32-C5 and ESP32-C6 may look similar, but that does not guarantee pin compatibility.
- Board format affects size, mounting, headers and exposed pins
- Chip variant affects WiFi, Bluetooth, Thread, Zigbee, USB and performance
- Both must be checked before choosing a board
When to Use an ESP32 DevKit
- You need many exposed pins
- You are still experimenting with the circuit
- You want easier access for jumper wires and test probes
- You are using a carrier board designed for that exact DevKit
- The project size is not extremely limited
The ESP32 DevKit format is the safest choice for early development and larger prototypes.
When to Use a D1 Mini ESP32
- You want a compact board with onboard USB
- You are familiar with D1 Mini-style projects
- You need fewer pins than a full DevKit exposes
- You want a smaller board but not the smallest possible module
D1 Mini ESP32 boards are a practical compact format for many WiFi projects.
When to Use a XIAO ESP32
- You need a very small ESP32 board
- You want a modern compact module format
- You are building a portable or space-limited project
- You want to choose between ESP32-C3, ESP32-S3, ESP32-C6 or ESP32-C5 in the same general board family
- You only need the pins exposed by the XIAO module
XIAO ESP32 modules are excellent when the board must be small and the project does not need a large number of external connections.
Which Format Should You Choose?
| Need | Best Format | Why |
|---|---|---|
| Most pins and easiest probing | ESP32 DevKit | Larger board exposes more signals and is easier to work with |
| Smaller than DevKit but still easy to handle | D1 Mini ESP32 | Good middle ground between size and usability |
| Smallest practical module | XIAO ESP32 | Very compact board format |
| Carrier board compatibility | Exact board specified by carrier manufacturer | Similar-looking modules may not be pin-compatible |
| Thread, Zigbee or Matter-related project | ESP32-C6 or ESP32-C5 board | Wireless chip capability is the deciding factor |
| 5 GHz WiFi support | ESP32-C5 board | Board must use a chip with 5 GHz WiFi support |
Conclusion
ESP32 DevKit, D1 Mini ESP32 and XIAO ESP32 boards can all be useful, but they serve different purposes.
- Choose an ESP32 DevKit when you need many pins, easy access and a comfortable development board.
- Choose a D1 Mini ESP32 when you want a compact board that is still easy to handle and program.
- Choose a XIAO ESP32 when size matters and the project only needs the pins exposed by the tiny XIAO format.
For carrier boards and PLC-style modules, always use the exact ESP32 board version specified by the product. Similar-looking ESP32-C5 and ESP32-C6 DevKit boards are not automatically pin-compatible, and choosing the wrong module can make a carrier board unusable.