A compact shield for ESP8266 and WeMos boards that provides a reliable SPI interface to a microSD memory card for data storage and retrieval. Benefits Extends microcontroller capabilities with external storage for robust data logging Protective circuitry guards against misconnection, overvoltage, and short circuits Small form factor and shield design saves board space Key features Function: SPI memory card interface via a microSD slot Compatibility: Works with ESP8266 and WeMos modules and standard microSD cards Size/Construction: Compact shield built on a durable PCB Performance: Fast, stable SPI data transfer with reliable protection Open source: Library included for easy integration into projects Why it's better Simplifies integration with a readytouse library Improves data reliability in field deployments Minimizes risk of card damage or board faults through protection features Use cases Sensor data logging for environmental monitoring and IoT prototyping Local offline storage when network access is limited or unavailable Diagnostic logs or firmware update records for later analysis