Questions tagged [rtc]
Real-Time Clock. Keeps track of current date/time. Some have batteries like the DS3231, and the DS3231 also has programmable alarms that can interrupt an Arduino.
188 questions
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RTC DS1307 gives random and incorrect time value [closed]
The RTC module can output the hours as 165, and the minutes as 165. This is some random number that is different every time. Everything works fine, but at random times I get this. Maybe once every ...
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Why this program runs on an R3 but will not run on R4 Wifi?
I have been working on this program for a few weeks now and finally got it somewhere near finishing. It uploads and seems to do what I want it to do on a R3 board but will not run on my R4 Wifi board ...
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DS3231 not keeping time when Arduino is turned off
I am trying to make an LED clock using an DS3231 to keep track of time, but for some reason, it's not keeping time when the Arduino is turned off.
I tried to disconnect the clock from a power source ...
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How to use an external 32kHz crystal for ESP32 S3 with Arduino IDE?
I want to use an external 32kHz crystal for RTC with ESP32 S3, but I didn't see any example or tutorial for Arduino IDE, Even when I asked ChatGPT, it gave me some example but the code gave library ...
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Arduino code intermittent
I have an alarm for "tea time", "lunch time" and "tea time". It works well at times but occasionally it gets stuck on the alarm not resetting, other times it does not ...
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RTC DS1307 module not working
I have a problem with an RTC: it doesn't work correctly. When I try to read date or time, I only see the characters "àààààààà" or or the program is blocked.
#include <Wire.h>
#include &...
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DS1302 RTC module running too fast
I am using a DS1302 RTC module with an Arduino Mega 2560 Rev 3. I follow steps on this website since I have no experience with RTC module before. Here are the outputs I am getting.
17:15:21.835 -> ...
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DS3231 with Arduino Nano for Timing precision
I need to synchronize two separate circuit boards working with Arduino Nano. The need is to activate one relay using Arduino-1 after 45 minutes, and another relay using Arduino-2 after 45.36 seconds. ...
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Code review for timer using RTC and OLED screen
I am building a small art project to display my current age with an accuracy of 1/100th of a second. I am using a XIAO SAMD21, a DS3231 RTC, and a 128x32 OLED screen. Here is what it looks like right ...
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LED button alarm with DS3231 RTC problems
I am a PHP web programmer, but I am a beginner studying Arduino. I would like to inquire about a problem with the following function that I am creating while looking for various references. (This ...
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How to set ESP32 RTC clock source
According to the manufacturer's link below, the default RTC timekeeping in the ESP32 is supposedly based on Internal 150 kHz RC oscillator.
Apparently, there is another option called Internal 8.5 MHz ...
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DS3231 RTC not working with ESP32
I am using ESP-32-WROOM-32 with a RTC DS3231 module. I have connected SDA & SCL pins of RTC DS3231 with ESP32 D22 and D23 pins. Also, the VCC of RTC is connected to 3V3 of ESP32 and the GND of RTC ...
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Equivalent libary of RTCZero for Arduino UNO
I am a beginner to Ardunino UNO
This is my first program to light up an LED strip
#include <Adafruit_NeoPixel.h>
#include <RTCZero.h>
#define PIN 6
#define NUMPIXELS 60 ...
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is there Raw RTC output?
I have an I2C Real Time Clock, DS3231 RTC module , and I just want something like Unix Time.
I'm using the uRTCLib, looking at the class methods
but dont see anything like that. I'm thinking there ...
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RTC problems after longer time periods
I'm using the MKR NB 1500 for server sending, an ENV shield for measuring the environment, and an external lithium battery to power the circuit. The internal RTC and WDT on the NB 1500 are used.
The ...
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