Pi RTC(DS1307), Real time
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This product is fully compatible with Raspberry Pi 4 (1GB, 2GB,4GB) and hopes you enjoy hacking with Pi 4 and all of other Pi 4 accessories.
The Pi RTC is based on the clock chip DS1307, it can provide a real-time clock(RTC) for raspberry pi via the I2C interface. Real-time clock of this module counts seconds,minutes, hours, date of the month,month, day of the week, and year with leap-year compensation valid up to 2100. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. If you want to keep this module timing when the Raspberry Pi is powered off, you need to put a 3-Volt CR1225 lithium cell in the battery-holder.
Support Raspberry Pi 2/ 3 B/B+ Zero/4
Suport seconds,minuutes,hours,day of week,month, year
Support 24-hour or 12-hour format with AM/PM indicator
56-byte, battery-backed, nonvolatile (NV) RAM for data storage
Programmable squarewave output signal
Automatic power-fail detect and switch circuitry
Applications need Real Time on Raspberry.
Pi RTC(DS1307) Eagle Files
Seeed Pi RTC Library