Story
After designing the “Clock Set Date Time” and hearing the suggestion of ArduPic , I thought it would be a good idea and also useful, add a “wake-up alarm.”
A small change to the code and adding a few components: Here’s “the Alarm Clock“.
Compared to the previous project, I added a buzzer Piezzo, a diode LED, a resistor of 220 ohms, a button and as said before, I listened to the suggestion of “ArduPic” and I removed the resistance to “pull down.”
Arduino Code
To remove the “pull down” resistances I had to make a change to the code.
Use the pullup resistors of Arduino, and reverse the code logic conditions.
pinMode(P1,INPUT_PULLUP);
pinMode(P2,INPUT_PULLUP);
pinMode(P3,INPUT_PULLUP);
pinMode(P4,INPUT_PULLUP);
if(digitalRead(P1)==LOW)
{
menu=menu+1;
Alarm Code
The activation and deactivation of the alarm clock is controlled by the “P4” button, line 444 “void Alarm()”.
To enter the alarm settings, you must use the “P3” “P2” buttons together, line 81 “if((digitalRead(P2)== LOW)&&(digital Read(P3)== LOW))”.
When the alarm is not set, the bottom of the display will show “Alarm Off” when the alarm is active, it shows the time that has been set.
Schematics
Read more: Build A Wake Up Alarm Clock Using Arduino