Piezo crystal clock code#
Piezo crystal clock series#

This can be difficult because there is no difference in the construction of a series resonant crystal and parallel resonant crystal because they are manufactured using the exact same process. When trying to find the best solution for clocking your application, it can be confusing whether a particular circuit arrangement requires a parallel or series resonant crystal. Choosing a Parallel or Series Resonant Crystal These theories of quartz crystal design are easily applicable to many applications. _alarm_minute = _rtc.For engineers that are working on digital designs, this note and associated video should reacquaint you with crystal oscillator timing theory and some practical aspects of circuit design.

_alarm_hour = _rtc.readnvram(NVRAM_ADDR_ALARM_HOUR) % 24 _alarm_state = _rtc.readnvram(NVRAM_ADDR_ALARM_ENABLED) ? ALARM_OFF : ALARM_DISABLED */ # include # include 'Clock.h' # define MINUTE 60 * 1000L /* ms */ # define TIMESPAN_DAY TimeSpan(1, 0, 0, 0) # define NVRAM_ADDR_ALARM_ENABLED 0 # define NVRAM_ADDR_ALARM_HOUR 1 # define NVRAM_ADDR_ALARM_MINUTE 2 UpdateWithDelays, leadingZeros, disableDecPoint) begin (DISPLAY_TYPE, digits, digitPins, segmentPins, resistorsOnSegments,

Void changeDisplayState (DisplayState newValue) */ # include # include 'Button.h' # include 'config.h' # include 'AlarmTone.h' # include 'Clock.h' const int COLON_PIN = 13 ĭisplayState displayState = Displa圜lock

Piezo crystal clock code#

Source code Download project View on GitHub alarm-clock.ino Please consult the datasheet relevant to your device to find out the relevant pin numbers. The pin numbers for your 7-segment display may differ.Diagram Arduino Safe Connection Diagram Pin Connections Arduino Uno Pin In this case, you will need to change the code to use a different display library ( SevSeg does not support this case), but this is out of the scope of this project. If you want to save on Arduino pins, you can use a 74HC595 shift register to cut the pin usage down to 6, or even a 7-Segment display with an integrated controller chip, such as This approach has a downside, however: it uses 12 GPIO pins! To keep the clock hardware down to minimum, the Arduino controls the 7-Segment display directly, using the SevSeg library. You can also use a Common Cathode 7-segment display, just adjust the DISPLAY_TYPE constant in config.h, and switch to NPN transistors.You can change the values of the TONES array, TONE_TIME and TONE_SPACING to customize the alarm and play different tones and melodies. AlarmTone - The AlarmTone class play the alarm sound.It uses the RTClib library to communicate with the RTC chip and track time. Clock - The Clock class manages the current time and the alarm state machine.It manages the user interface: the 7-segment display and the buttons. alarm-clock.ino - The main program code.Using a configuration file a common practice when you have several modules in your program. config.h - Configuration options for the clock: whether to use an RTC chip, Snooze time, and more.The code is divided into several modules: To stop the alarm, hold down the Alarm button for one second or more. The screen will display four circles to let you know that the alarm was snoozed. When the alarm goes off, press the Alarm button briefly to snooze it forĩ minutes. To finish, press the Alarm button again, or just wait a few seconds.

You can use the Minute/ Hour buttons to adjust the alarm time. The screen will display the alarm state by showing the word 'on' or 'off'.Īfter enabling the alarm, the current alarm time will be displayed for a few seconds. Pressing the Alarm button enables/disables the alarm. To set the time, press the Minute/ Hour buttons. Power loss recovery: current time and alarm settings are stored in RTC.Optional RTC to make the clock more accurate.The colon symbol blinks to indicate seconds.The alarm sound can be easily customized in code, and even play melodies.Programable alarm with a snooze function.Two buttons for setting the current time (Hour / Minute).This digital alarm clock displays the time on a 4-digit 7-segment display.