WEMOS ESP8266 D1 Pro mini

WEMOS ESP8266 D1 Pro Mini (16MB + External Antenna)
If your project is living inside a metal enclosure or needs to talk to a router that's far away, the D1 Pro Mini is your best solution. It keeps the same "Lego-brick" stackable design but swaps out the basic components for high-performance alternatives.

What makes it "Pro"?
• Massive 16MB Flash: Most ESP8266 boards only have 4MB. This Pro version gives you 16MB (128Mbit), which is perfect for OTA (Over-The-Air) updates, large data logs, or hosting a high-detail web dashboard directly on the chip.
• Dual Antenna Options: It features a built-in ceramic antenna for everyday use, but also includes an IPEX/U.FL connector. You can snap on an external high-gain antenna to punch through walls or extend your range significantly.
• Superior USB Chip: It uses the CP2104 USB-to-UART interface. This chip is known for being more stable and faster during code uploads than the basic versions found on cheaper clones.

Compact & Capable:
• 11 Digital I/O Pins: Just like the standard mini, you get 11 pins that support PWM, I2C, and Interrupts. It also has one analog input for reading sensors.
• Stackable Ecosystem: It is 100% compatible with all D1 Mini shields. You can stack sensors, relays, or battery shields right on top without needing a breadboard.
• Arduino Ready: It works perfectly with the Arduino IDE and the existing ESP8266 ecosystem, making it easy to migrate your existing code to this more powerful hardware.

Best For:
This is the top choice for industrial monitoring, long-range IoT systems, and projects that require high memory. If you're building a device that needs to be updated wirelessly or needs a rock-solid Wi-Fi connection from a distance, this is the board for the job.