{"product_id":"adafruit-pirtc-precise-ds3231-real-time-clock-for-raspberry-pi","title":"Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi","description":"\u003cp\u003eThis is the best battery-backed real time clock (RTC) you can get that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data-logging, clock-building, NTP servers, time-stamping, timers and alarms, etc.\u003c\/p\u003e\n\u003cp\u003eEquipped with \u003cstrong\u003ea genuine DS3231\u003c\/strong\u003e RTC, it works great with the Raspberry Pi and has native kernel support.\u003c\/p\u003e\n\u003cp\u003eThe datasheet for the \u003cstrong\u003eDS3231\u003c\/strong\u003e explains that this part is an \"Extremely Accurate I²C-Integrated RTC\/TCXO\/Crystal\". And, hey, it does exactly what it says on the tin! This \u003cstrong\u003eReal Time Clock (RTC) \u003c\/strong\u003eis the most precise you can get in a small, low power package.\u003c\/p\u003e\n\u003cp\u003eMost RTCs use an external 32kHz timing crystal that is used to keep time with low current draw. And that's all well and good, but those crystals have slight drift, particularly when the temperature changes (the temperature changes the oscillation frequency very very very slightly but it does add up!) This RTC is in a beefy package because the crystal is inside the chip! And right next to the integrated crystal is a temperature sensor. That sensor compensates for the frequency changes by adding or removing clock ticks so that the timekeeping stays on schedule.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMany \"cheap\" DS3231 RTC boards do not use genuine Maxim DS3231's - you'll get a non-calibrated RTC which does not maintain the timekeeping quality that is specified! Adafruit purchase these DS3231's from Maxim direct so we know they are 100% genuine.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWorks perfectly with any \u003ca href=\"https:\/\/learn.adafruit.com\/adding-a-real-time-clock-to-raspberry-pi\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eRaspberry Pi (or similar single board linux computer)\u003c\/a\u003e including the Pi 1, Pi 2, Pi 3, Pi 4, Pi Zero, A+, B+ etc.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFully assembled \u0026amp; tested PCB plugs directly into your Pi's GPIO pins - \u003cstrong\u003eNo soldering required!\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWill keep time for 5 years or more\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote: This product does not come with a CR1220 coin cell battery.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL DETAILS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eProduct Dimensions: 21.3mm x 20.0mm x 13.6mm \/ 0.8\" x 0.8\" x 0.5\"\u003c\/li\u003e\n\u003cli\u003eProduct Weight: 2.7g \/ 0.1oz\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eLEARN\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/learn.adafruit.com\/adding-a-real-time-clock-to-raspberry-pi\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eAdding a Real Time Clock to Raspberry Pi\u003c\/a\u003e - Keep time at all times with a real time clock\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":29236698120275,"sku":"ADA4282","price":14.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4282-04.jpg?v=1562149044","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-pirtc-precise-ds3231-real-time-clock-for-raspberry-pi","provider":"Pimoroni Ltd","version":"1.0","type":"link"}