Real time clock (RTC) module PCF8523. It uses a 32.768 kHz oscillator and offers an accuracy of 2 seconds/day. The clock counts seconds, minutes, hours, day of the month, month, day of the week and year with leap year compensation. It has a programmable alarm built in. There is a CR1220 battery socket on the board. It is powered with the voltage from 3 V to 5 V, and communication is via the I2C interface. Full documentation is available on the product page.
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Lithium Coin Cell Battery, 3V, 12x2mm. BATCR1220-k
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A set of 40 pieces of female-female connecting cables in various colors, 10 cm long
A set of 40 pcs of male-female connecting cables in various colors, 10 cm long
A set of 40 pcs of male-male connecting cables in various colors, 10 cm long
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