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Questions tagged [ds3231-alarms]

Use for topics in reference to the alarms functions of the DS3231 Real-Time Clock

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1answer
54 views

Maintaining time in Arduino

I am working on development of alarm clock using Arduino. No doubt RTC will be the best but it increases the Price of the project. Also I opened a digital clock (which I purchased online) and I see ...
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0answers
19 views

Arduino based hour counter [duplicate]

I would like to make a hour counter for a particular machine.I have a problem in coding.arduino internal clock can work only till 49 days.my hour counter should calculate 150+ hours.I thought of using ...
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1answer
299 views

'RtcDateTime' does not name a type

I've tested a code that compiles successfully. But after i merged it to another code, here it shown an error says RtcDateTime doesn't name a type. Used library : https://github.com/Makuna/Rtc Some ...
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2answers
87 views

What precision can I expect by syncronising DS3231 with PC serial?

The point here is to syncronise a DS3231 module (on an Arduino) via serial port with NTP time by computer. The problem here is that I'd like to know how much time is taken by the serial and I2C ...
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256 views

Ethercard SD and DHT11

I want to build a web page on an ATmega328 that will link me to an SD card file with the saved values of a DHT11 sensor. I manage to program the "Web Server" on the atmega328 and the code that creates ...
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1answer
274 views

How to only detect the opening and closing of door sensor once

im quite new to Arduino coding. Currently im trying to create an alarm and when the alarm ring, the user will just need to remove the door sensor once to stop the alarm and listen for the next alarm. ...
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2answers
435 views

Using RTC DS3231 + Arduino UNO to calculate time lapsed [closed]

I am a beginner with no coding background. I am trying to figure out an alarm that tells people how long they have been sitting on their chair. The concept is very simple when the person would sit in ...
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63 views

5 * tm1637 displaying different school bells timings

I am working on a project which displays time of School bells for a school, I have got 5*TM1637 Display Tubes which displays 5 Periods/Classes start timings.I can set digits of each TM1637 using the ...
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1answer
7k views

How to set Alarms on the DS3231 easily so the Nano doesn't have to go to sleep with delay statements?

I want my solar array sun tracker to shut down at night then move full east in the morning to catch the first rays. I know the DS3231 can set alarms but it is not clear from its documentation how ...