![]() ![]() If your Arduino has a Crystal oscillator, it will be much more accurate (to something like 150ppm, meaning a maximum deviation of about 1 second per day under normal conditions). Many Arduinos or their clones use a Ceramic Oscillator that generally have an accuracy of about 0.1 to 0.5%, meaning a possible deviation of 43 seconds per day and as such maybe too inaccurate for your purposes. The accuracy of the timing will be dependent on the type of oscillator on your particular Arduino board. In other cases (for example, if you change the expression to 24*60*60*1000), the compiler will not automatically generate an unsigned long and you need to force it by changing the first part of the expression to an unsigned long: 24UL*60*60*1000 or, alternatively (unsigned long) 24*60*60*1000. In your case (with such an obviously large number), the compiler will automatically choose the right type. This explicitly tells C++ to expect an "unsigned long" (which in Arduino Uno terms is a 32-bit unsigned number). When dealing with large numbers such as your 24-hour delay, make sure to explicitly cast those numbers as unsigned long, or expressing them with the "UL" extension (like for example 86400000UL). ![]() Look up Blink without delay for an example of how to accomplish such a delay while being able to do other things in your code while waiting. However, delay() will make it impossible to do something else in the meantime. Thank you.Yes, the delay() will work, as will other methods based on the millis() counter. If you enjoy our content and learn something new,Īnd subscribe to our blog so you stay updated with new tutorials. If you have any questions please feel free to leave a comment.Īlso don’t forget to check out “ Weather Monitoring & smart gardening“ I hope this tutorial was helpful and you learn’t something new. ![]() For more details on how to use the timer just watch the video here. The timer can be stopped at any moment by long pressing the start key. Now you can connect a relay to Pin 7 of arduino and use the timer to set the on time for any number of minute or hours. Now you have a programmable relay timer where you can set Time in Hour and minute.
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