Directly attach a real-time clock to the Raspberry Pi (Without Soldering)
Since the Raspberry Pi is intended to be a low-cost product, all of the features we are used to seeing on a computer have been left out. Your laptop and computer, for example, contain a small coin-battery-powered "Real Time Clock" (RTC) module that retains time even when the power is turned off or the battery is removed. An RTC is not included with the Raspberry Pi to keep costs down and the size limited. Instead, the Pi should be linked to the Internet through Ethernet or Wi-Fi, and the time should be automatically modified from global ntp (network time protocol) servers.
When the electricity goes down, you won't be able to hold the time for stand-alone tasks without a network link. So, in this project, we'll teach you how to keep time on your Pi with a low-cost battery-powered RTC!
A Quick Overview of the Raspberry Pi Real-Time Clock
The Raspberry Pi does not have a Real Time Clock module to hold costs down. Instead, users are required to keep time by monitoring the network while it is either attached to Wi-Fi or Ethernet. Since we want to add a third-party module.
We have found a USB RTC for Raspberry Pi that can be recommend as the cheapest, most precise, and fastest RTC device.
This is a great battery-backed real-time clock (RTC) that holds time for the Raspberry Pi project even though the power goes out. Perfect for data recording, clock construction, time stamping, clocks, and alarms based applications. It fits for every Raspberry Pi (or equivalent single board computer) that has MCP2221 (https://www.microchip.com/), including the Raspberry Pi 1, Raspberry Pi 2, Raspberry Pi 3, Raspberry Pi Zero, Raspberry Pi A+, Raspberry Pi B+, Raspberry Pi 4, etc.
For more details visit : USB-RTC for Raspberry Pi Kickstarter
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