Introduction: MSP430 & RTC (Real Time Clock) Module
In this instructable, we'll see how to use the RTC (Real Time Clock) Module with the MSP430 Microcontroller.
The RTC Module uses a DS1302 Timekeeping Chip, ypu can find the datasheet of the device here:
Supplies
MSP430 Launchpad, Code Composer Studio, Jumper cables, RTC Module (DS1302 Chip with quartz crystal and battery)
Step 1: Connections
The connections that you can see in the picture:
5V pin on the MSP430 Launchpad --> Vcc on the RTC Module
GND pin on the MSP430 Launchpad --> GND on the RTC Module
P1.4 pin on the MSP430 Launchpad --> CLK on the RTC Module
P1.0 pin on the MSP430 Launchpad --> DAT on the RTC Module
P1.5 pin on the MSP430 Launchpad --> RST on the RTC Module
Step 2: Code & Conclusion
There are two codes associated with this setup:
https://github.com/selimg76/microcontroller/blob/m...
with the code above, you can setup the seconds,minutes, hour... values of the RTC Module and do a one-time read at the time you complete writing these values. This code is only for setting up the values on the timekeeping chip.
The second code:
https://github.com/selimg76/microcontroller/blob/m...
reads the 8 bytes for getting the seconds, minutes, hour, date of month, month, day of the week (1 to 7) ,year and the control register values. Reading these values ten times a second (the delay in the while (1) loop is 100 miliseconds) it checks a condition and turns on the on board LED (P1.6) accordingly.
Controlling the RTC Module and integrating it with your microcontroller gives you lots of opportunities: you can sutomate tasks based on the weekday, on a specific time of the year or according to the seasons.. There are lots of application areas that you can use in smart homes, smart farms etc.
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Thank you for your time and see you in another instructable!
