IC DS3231 Real Time Clock (DS3231) Module Breakout Board with Battery Backup
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IC DS3231 Real Time Clock (DS3231) Module Breakout Board with Battery Backup, DS3231 RTC Module - Button Battery Backup This is a Real-Time Clock module with back-up battery designed for Raspberry Pi, but it can also be used to Arduino. Plug it into Raspberry Pi GPIO interface, and you're good to go. This is the easiest way to keep it in time.Features: Button battery Smaller Work in 3.3V and 5V Supported Raspberry Pi and Arduino Compatible with Raspberry Pi A+, B, B+/2Specification: DS3231 RTC IC Self-adjust 3.3V and 5V Size: 14x16x12 mm Pin Out (Square pad as Pin 1) Pin 1 = Vcc Pin 2 = SDA Pin 3 = SCL Pin 4 = N/C Pin 5 = GND