RTC I2C IIC DS3231SN Real Time Clock Module

Description : Can provide for arduino libraries and routines Use DS3231SN precision clock chip, built 32.768 crystal Can provide precise year, month, day, hour, minute, second, in the morning and afternoon data You can output 1Hz signal, a second output signal You can use the CR1220 coin cell holding travel time The pull-up resistor R1 R2 own welding on the I2C bus Small size 3cm in diameter Pin spacing 22.86mm