![]() The main purpose is to step down the 12v to 5v DC by using a 7805 voltage regulator which gives you an output of 5v DC. You can use the external power supply as shown in the circuit diagram. ![]() The whole system works on the 5v DC supply. RTC-Lib Library (Download it from HERE)Ĭircuit Diagram Circuit Explanation Power Supply Circuit.Arduino IDE (You can download it from HERE).which means I can get a small commission on the sale. Hardware Requirements Disclaimer: It may contains Amazon affiliate links. Press SW1 to start, press SW2 to pause, and press SW3 to reset the stopwatch. Pressing SW3 will initialize the stopwatch. Pressing SW4 will change the mode set to STOPWATCH. In this mode, the user can start, pause, stop, and reset using this mode. Press SW4 & SW2 simultaneously to exit from the mode. And then after this, you can see it redirect to the main screen and the timer will start automatically. Pressing SW2 will change the minute section and increase the value. Again pressing SW4 changes the mode and pressing SW3 will initialize the counter or timer. In this mode, the user can set a countdown timer. Now you can see that you are at the main screen displaying the current time and alarm set time. After setting the desired value press SW1 to exit the setting. Press SW2 to increase the value of that position and SW3 to decrease the value. If you want to change the hour change it directly as it is in the hour by default. Every time you press SW1 it will change the position from the hour to the minute, to the second, and then exit. Then press SW1 to change the position of the cursor. Press SW4 to change the mode to SET ALARM. In this mode, the user can set the alarm. And after completing any of the other mode tasks it redirects to this screen. You may call this the default of the initial screen which displays time, temperature, and humidity by default. This is the main screen and the default screen, from here we will navigate to other screen and return back to this screen. We will start with the default mode and then we will change the mode and work on every mode. Here we will see each and every modes of operation. This project works in four different modes of operations. (Please refer to the circuit diagram strictly recommended) Working of Project This system is having four modes of operation. And this is the reason why the time is accurate after being powered off in any digital system that tracks records or logs data with time. DS1307 is attached with an external button cell which keeps the time tickling after even the power goes off. This project is built with Arduino UNO as the brain, a DS1307 RTC module to keep track of the time and a DHT11 sensor to get the room temperature and humidity.
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