But I can say with my experience testing battery life, the best option is using a ultra low power timer IC. After your desired number of dots, clear the output. I will during the sample, so long as the button is pressed turn on the led. This takes some work and code re-organization. To keep your Arduino loop() running you need to remove these calls to delay(). Most Arduino sensor libraries use calls to delay() to wait for the reading to become available. ![]() But when I removed both rules (digitalWrite and delay(1000)) the sampling time is correct. The next task in this project is to read the temperature that is going to be used to control the damper. You need to run your millis () timer and increment a ‘dot’ counter every (350ms) then as the timer elapses, bump the counter, and print a dot. And also the outputValue (which is linked at the delaytime of sampling) is not going to 100. On the other hand, I am using actually a interrupt and deep sleep mode, working okay with atmega328p and rtc ds3231. You can’t use delay (), and indeed, you shouldn’t use a for () loop in this way - they both block your code from executing anything else. Once you understand multithreading, you will never find a use for delay(), Okay I will read about multithreading. This usually gives me between one and three orders of magnitude improvements in battery lifetime. In the void loop (and any function called from the void loop) you don’t want to block the execution of the code too long, especially if you plan to do some kind of multi-threading with your Arduino. If you think you have an exception to this rule, you are wrong.īecause I work with low-powered devices, I care a lot about sleep, so I use the DeepSleepScheduler library ( GitHub - PRosenb/DeepSleepScheduler: DeepSleepScheduler is a lightweight, cooperative task scheduler library with configurable sleep and task supervision.), which puts the chip into sleep mode if there is nothing to do, and wakes it up after a time interval. Don’t bloat your void loop, just as you don’t bloat your main in a standard C/C++ program. My advice has always been, if you write a delay() statement in anything other than a toy example, you have made a fundamental design error. There is an excellent article at Overview | Multi-tasking the Arduino - Part 1 | Adafruit Learning System that explains this. You need to wrap your head around the concept of pseudo-concurrency, or sometimes called cooperative multithreading. In general, you should avoid the use of delay() for any reason. The function delay() uses interrupts to calculate time but is actually Do Nothing loop to waste processor time - it does not return any value.
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