D1 mini double-sided insert breadboard WIFI IoT development board

What it is: A double-sided universal prototyping PCB shield designed to stack directly onto or underneath the ESP8266/ESP32 D1 Mini development board.

Layout & Design: Features a matrix of plated through-holes ( standard $2.54\text{mm}$ pitch) with double-sided solder pads, making it easy to solder custom circuits, components, and headers directly to your D1 Mini pins.

Key Benefit: Converts breadboard prototype circuits into a permanent, compact, and reliable hardware shield without requiring custom PCB fabrication.

Common Uses: Building compact Wi-Fi / IoT nodes, custom sensor expansion shields, relay boards, and permanent smart home micro-controllers.