However, we will not delve deep into the inner workings of the I 2C interface on the Raspberry Pi. The DS1307 IC uses I 2C serial interface for communicating with the host CPU. To do that, the host needs accurate time information, and the RTC is one of the best candidates for keeping track of the time. So, in applications where there are sleep modes, the host will need to know when to wake up the device or send it to sleep. This includes incorporating sleep modes in an application to conserve battery power and extend the battery’s life. Power control – One of the most efficient ways of improving a battery powered Raspberry Pi’s operating time is by using an RTC.This avoids data loss or data collision from the sensors in our network. So we need to synchronize the time of all the remote nodes such that they send data at the correct times. Each sensor is supposed to send its readings at specific intervals predetermined by the system. Synchronization – Suppose we have many sensors that send data to a central data storage device. Besides accurately keeping time, real-time clocks on the Raspberry Pi can be used for: This comes in handy, especially in data-logging applications where the sensor readings are supposed to have accurate date and time stamps. Keeping track of the date and time on the Raspberry Pi or any microcontroller system is an important task. Uses for real-time clocks on the Raspberry Pi This is to ensure that the RTC keeps running when the computer’s power is switched off. Common RTC modulesĪs we can see in the image above, RTCs run on a coin cell battery (usually a 3V CR1220 battery) so they are not connected to the computer’s power system. Pin headers are also added to make it easy for users to connect to their applications. An RTC module consists of the real time clock chip, a coin cell battery holder, a crystal oscillator, and an I 2C interface. NXP and Microchip are the biggest vendors in this market. What are real-time clocksĪ real-time clock is an electronic integrated circuit (IC) for accurately keeping track of the date and time. We will describe how real-time clocks work, how to connect them to the Raspberry Pi, and finally, describe all the steps required to setup the DS1307 real time clock on the Raspberry Pi. In this tutorial, we will focus on real time clocks.
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