I use some schematic as in previous article but is different sketch.
I adapted original sketch from educ8s.tv to use manual adjustment for date and hour, alarm. Also, I remove RTC library and use subroutines for set and read data and hour, for read inside temperature of DS3231, alse I stored in EEPROM memory hour, minute and state of alarm.
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)
I made a clock with manual adjust for data and hour without RTC library, just use subroutines.
For 1.8"display with ST7735 driver I use TFT_ST7735 library adapted by Bodmer after Adafruit library.
I use next schematic:
with TFT_DigitalClock_RTC1c.ino sketch (in sketch you will find links with original info about some soubroutines).
If you push MENU button, enter in mode to adjust hours, then minutes, day of week, years, mounth, day, after that Arduino send data to DS3231 to store and after that clock will work normally, see in adjuting clock with thermometer using DS3231 on 1.8" ST7735 display movie:
I buy an small 1.8" TFT display with ST7735B driver and I try to connect directly to Arduino Uno board as I see on net... but result was not good... display is almost white
and just disconnect accidentaly the GND I can see something...
So, I search on Arduino forums and on net (article INSTRUCTABLES: Arduino TFT display and font library ) and I found a solution like Nokia 5110 monochrome display .. I put 1k resistor on each data pins to Arduino to display:
and I tested more Arduino library for this display with ST7735 driver (from Adafruit, TFT library, ucglib library, etc) and I made move to see .. movie is named ST7735B display with Arduino board
and after I push MENU/OK button, on display is undervoltage thereshold, who cand change with + & - buttons:
After I push MENU button, value is stored in EEPROM memory, on display is overvoltage thereshold, who can be change by + & - buttons:
after push again MENU button, value is stored in EEPROM memory, on display is delay-off tine in second for reconnect coil relay after voltage inoutside range:
31.07.2020
I added a sketch to use LCD1602 alphanumerica display on i2c connexion instead existing display (with MAX7219 and 7-segment led display). Sketch is main_supply_emonlib_under_overvoltage_ver4.ino !
