With this RTC-Shield the D1- Mini can be extended by real time clock.
• DS1307 chipset• optional: CR1220 backup batteryPinout• 5 V: 5 V power supply• D1: SCL• D2: SDA• GND: GroundNote:Delivery includes 6 pin headers (2x 8 pin male - male, male - female, male long pin - female each).
CR1220 button cell not included!