The WeMos D1 Mini Data Logger Shield can save data like digital events and analog measurements, together with a precise time and date stamp, to a micro SD card (FAT16/32). An optional CR1220 lithium battery keeps the timekeeper running for several years without an external power supply.
These are the I/O lines the Data Logging Shield is using to connect to the WeMos D1 Mini WiFi board:
I2C for the RTC:
D1 - SCL
D2 - SDA
SPI for CD card:
D5 - CLK
D6 - DO
D7 - DI
D8 - CS
Pin headers included.
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