I want to make a digital clock like the ones used for timing at races. The idea was to have the Arduino (Uno) turn on and off a bunch of leds (WS2812B) in the pattern representing each digit of a digital clock. Knowing nothing abut the Arduino I just assumed it would be accurate (down to a second) …

@bluejets I have never asked anybody to do the work for me? If I knew how to do everything there's hardly any point in being in a forum asking for help? That's also why I was asking for pointers on how to do what was suggested, which i have yet to find in a form that's somewhat understandable for m…

Take a look at post #5 in this link: 1HZ SQW

Install the Adafruit DS3231 library, find the ds3231 example sketch, replace this void setup () { Serial.begin(57600); #ifndef ESP8266 while (!Serial); // wait for serial port to connect. Needed for native USB #endif if (! rtc.begin()) { Serial.println("Couldn't find RTC"); Serial.f…

You're quite welcome, that should be all you need. If you have further problems please post your code and we will help.

[image] bypr0xy: I would need accuracy down to a second without drifting over the course of a few days (let go with four for now). 1 second in 4 days is about 3ppm, which is a pretty high bar. You could get one of the Arduino clones that has a crystal instead of a resonator for the main cloc…

First of all, sorry for late response. I feel little bit responsible for this discussion over DS3231 use and accuracy to a second or under second. Second thing, it seems to me little harsh against to @jremington . I mean this: [image] bypr0xy: [image] jremington: The first thing to do is to…

The Uno clock source is a resonator, affected by temperature. You can get or build a board with a crystal, it will be crystal watch accurate. No RTC required except if you want the features.

In case he decide to use the 32k output, it is more feasible use the 16-bit. Timer/Counter1 (pin #5) in case of UNO. Let say go down to 1024 by prescaler and deal with residuals similarly like in case of original Arduino micros/millis, already pointed out by @JCA34F (post#16). There are many possib…

Thank you for taking time to reply :slight_smile: I'm all for helping and I really do appriciate all the help you guys provide, but there's a difference between reading and genuinely wanting/trying to understand the topic and offer a possible solution (like you did, and again I appriciate that a lo…

Accurate timer/clock

Projects Programming

dougp January 31, 2024, 1:16am 35

There's also - https://www.youtube.com/watch?v=2xZ15ntJy20

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Accurate timer/clock

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