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Topic: Big Clock LCD Display (with extras) (Read 6704 times) previous topic - next topic

WilliamK Govinda

Feb 26, 2013, 02:36 pm Last Edit: Feb 26, 2013, 06:21 pm by WilliamK Govinda Reason: 1
Here's a small Big Clock LCD Display I worked on, so I could display some agenda stuff, have alarms, etc ...

Gear used:

- Arduino nano (coded for the old ATMEGA168, but works with the new ATMEGA328 too)
- RT Clock + EEPROM
- Big 20 x 4 LCD Display
- Ultrasonic Sensor Module
- Buzzer

I will post the code and also links to each part I used after this.

The device is a custom clock with agenda and special alarms. Up to 50 events in the alarm, with option of recurring events, simple reminders and daily alarms. The ultrasonic sensor allows you to switch off an alarm, or display the entire agenda-events. The LCD will display a BIG Time, small Weekday/Day/Month (its all done in Day/Month format, sorry) plus the next event in the agenda. (if its a fixed-day event, not a daily event) The unit is programmed via serial, so its always connected to my PC. But when my PC is offline, it will still work since its totally self-contained. (serial use is just to set clock and events/alarms)





RT (Real Time) Clock + EEPROM



Arduino Nano (this has a better chip)



Ultrasonic Module


WilliamK Govinda

Feb 26, 2013, 02:43 pm Last Edit: Mar 01, 2013, 05:10 pm by WilliamK Govinda Reason: 1
Attached is the code. (2 files)


looks good! well done and thanks for sharing

WilliamK Govinda

I just updated the code above, fixed a few bugs, improved a few things.


We are now june 2018 and it looks like that the two files don't work anymore in Arduino IDE. Is there somewhere an upgrade for these files ..... and a schematic how to connect all together?
Many thanks,


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