![]() Add the following to the to the end of this fileĬheck your I2C bus with, sudo i2cdetect -y 1.Choose Advanced Options then I2C and select yes to enable the interface.Unless you have done so previously, I2C must be enabled on your pi. RTC DS3231M front Pi GPIO pinouts RTC and pi connections Configure I2C on your Pi Refer to the following images of the RTC and the pi's GPIO pinouts. SDA - Serial Data Input/Output, connect to SDA.SCL - Serial Clock Input, connect to SCL.These are more useful for microcontrollers. SQW - Active-Low Interrupt or Square-Wave, not used for this guide.32K - 32kHz Output, don't use unless you have a special need.The RTC DS3231M has the following pinouts which should be connected as shown: WARNING: The pi must be powered down whenever you are connecting or disconnecting pins. Converting and reading the temperature using register addressing and bit logic.Upon boot, initializing and using the RTC for timekeeping.Setting up I2C on the pi and addressing the RTC.Using the clock will be demonstrated using python and shell programming. These types of alarms are useful for many devices, such as microcontrollers, but not as useful for a microcomputer like the pi. The DS3231 is very capable of calendar and interrupt alarms.Alarms and calendars will not be covered in this guide.The temperature is also only updated every 64 seconds or by setting a bit flag. Internally, the temperature is stored in 2s-complement format in the address registers.Extracting valid ambient temperature readings from the RTC.This allows correct timekeeping, even without an Internet connection, through power down cycles.Using the DS3231M module as the RTC for a raspberry pi.If not please see the RPi Initial Setup Guide. This guide assumes you have an installed and functioning Raspberry Pi. Next up?Īfter reading this guide, you may be interested in reading: Address and data are transferred through an I2C bus. ![]() Two programmable time-of-day alarms and a programmable square-wave output are provided. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The RTC maintains seconds, minutes, hours, day, date, month, and year information. It incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The DS3231M is a low-cost, extremely accurate I2C real-time clock (RTC) with temperature compensation. ![]()
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