#SIMPLE ALARM CLOCK MOULA SERIAL#

One 16X2 LCD Module for displaying the time.

Connecting wires & jumpers are needed obviously.

Arduino UNO is recommended as the main component.

When the alarm is set (you can recognize this by the fact the alarm turn on mark LED in bottom right) and Clock will start to play your favourite morning song:) there are following functions avaliable - left button (Snooze for another 5minutes), middle button (cancel alarm).Code Explanation & Working Principal Hardware / Equipment Needed In Alarm menu there are following functions available - left button (Set alarm for hours) middle button (Set alarm for minutes) Right button long press ( confirming alarm), long press of middle and right button (erasing existing alarm). When you doublepress right and middle, you will enter the alarm menu. There are three buttons, left, middle, and right. And when the function UpdateDisplay is called the data are shifted to outputs (for more info see screen from arduino IDE)Īlarm Setup. So first step (preparing the data for shift register is happening in function Displa圜har, where you just find the wanted symbol from array of constant and prepare data for registers. I use quite different and I would say easier way to control shift registers (thanks to my friend Krystof who wrote this smooth function). What this mean? - dont use any delays! - otherwise it wont show you numbers but just blinks:) In the next step you will turn off this row and prepare second row and this again and again.

In the main loop you just basically check whether some button is pressed, check whether the RTC send you newly updated values of minutes and whether its time to play some pink floyd song:) and if not, you just periodically turn on and off LEDs with set numbers.Ĭontrolling the LED matrix - For better understanding it is good to follow instructables for LED matrix I mentioned at beginning, but just briefly - it is important to understand that to show numbers or letters in this Matrix, you need to periodically choose which LED from set row will need to be turned on, and then turn the all LEDs from row for some time. In part related to arduino I would just like to briefly describe the main loop algorithm and then few words to controlling the Shift registers through SPI and Alarm setup. The wiring for arduino can be clearly seen in Arduino code:)

#SIMPLE ALARM CLOCK MOULA SERIAL#

To be honest from some reason I wasn´t successful in serial communication (it didnt work together with SPI and I2C communication used for other componets) but I was kind a OK just to use IO pins (I used ADKEY1 connected to arduino Digital output as a trigger to play song and than pin USB+ to stop the music).Īs you can see on picture, I used three simple buttons on prototyping board connected to Digital Inputs of arduino with pull down 10kOhm resistors. MP3 shield DHF player Mini - This MP3 shield is really easy, you can upload some mp3 to SD card, connect any speaker you find and then it can be operated in two ways either through serial communication, or by I/O pins. The other HW components to build alarm clock are: RTC module, MP3 shield, Buttons and arduino UNO.įor RTC module I used module DS1307 and library MD_DS1307.h its quite simple everything works smoothly, but I would recommend probably use more precise RTC module like 3231 or other - if I let it without power for about few days it started to loose some seconds.

Simple alarm clock moula