Matrix clock with alarm

   At begin of this year I find article Mini led clock and I test using changed sketch (mini_clock_1a.ino) and schematic

   Also, I made 2 movie:
- clock on matrix led display with MAX7219

- clock on matrix led display with MAX7219 (2)

   Now, I add alarm feature, schematic is now

   Using mini_clock_1_2.ino sketch now you can see data and if alarm is activate by pushing second button (if alarm is deactivate, on screen not apear text with them).
    I made matrix mini clock with alarm movie when you can see how clock work

  

Another adjusting clock with alarm, hygrometer & thermometer on 1.8" ST7735 display

   I use feature from article Another adjusting clock with alarm & thermometer using DS3231 on 1.8" ST7735 display and change reading internal temperature of DS3231 with DHT22 senzor (AM2302), but you can use a cheaper and not very precise DHT11 senzor.
   Schematic is now:

   My test montage is

   By using educ8stv_rtctft160_alarm_dht.ino or much better educ8stv_rtctft160_alarm_eeprom_dht.ino sketch, on display you can see: name of day, date, hour clock, hour alarm, temperature and humidity

   In another adjusting clock with alarm, thermometer & hygrometer using DS3231 on 1.8" ST7735 display you can see info on display and hoe change/adjust hour, data, hour alarm, activate and deactivate alarm, etc:

   Alse, I made another movie, named another adjusting clock with alarm, thermometer & hygrometer using DS3231 on 1.8" ST7735 display (2), where I try to explain more detailed the feature of this clock...

Adjusting clock with alarm & thermometer using DS3231 on 1.8" ST7735 display

   In previous article I made a clock with manual adjust for date and hour, noow I put a push button for activate and deactivate alarm, also in menu I can change hour and minute for alarm.
   When alarm is activated a small sign and hour for alamr is with whilte

when alarm is deactivated sign and hour is with blue colour.

    When is time alarm (1 minute), if alarm is activate sign is red and LED is lit (instead led you can put a relay module for power a radio, a bulb light, etc)

but if you push ALARM button alarm is deactivade

   Schematic for made this clock is

and the sketch is TFT_DigitalClock_RTC1d.ino.

   I made a movie named adjuting clock with alarm & thermometer using DS3231 on 1.8" ST7735 display when you can see who the clock work:

   PS: I made some changes in last sketch to store hour and state of alarm in EEPROM memory of ATmega, see TFT_DigitalClock_RTC1e.ino !!!