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Arduino Mega 2560 R3 + RTC DS3231: excellent accuracy (12 months) + Daylight saving time ~ Česky ᴴᴰ
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Daylight saving time 2015 - moment of switching from Winter to Summer time
Clock goes from 01h 59m 59s → 03h 00m 00s
Exact time was taken from NTP server and was shown on the TFT display. Backup RTC kept almost exact time.
DS3231 Extremely Accurate I²C - real accuracy for 12 months:
difference between RTC and NTP is circa 10 seconds, so accuracy is about 1 sec per month. It is much better than datasheet says!
DS3231 RTC module - 5V & 3.3V TTL logic, I²C interface
Datasheet says:
● Accuracy ±2ppm from 0°C to +40°C
● Accuracy ±3.5ppm from -40°C to +85°C
2ppm accuracy corresponds 63 seconds per year.
3.5ppm accuracy corresponds 111 seconds per year.
Performed by Actors:
Arduino Mega 2560 R3 + Ethernet Shield + RTC DS3231 + SPI TFT 1.8"
Source code:
Purchased:
#arduino
Clock goes from 01h 59m 59s → 03h 00m 00s
Exact time was taken from NTP server and was shown on the TFT display. Backup RTC kept almost exact time.
DS3231 Extremely Accurate I²C - real accuracy for 12 months:
difference between RTC and NTP is circa 10 seconds, so accuracy is about 1 sec per month. It is much better than datasheet says!
DS3231 RTC module - 5V & 3.3V TTL logic, I²C interface
Datasheet says:
● Accuracy ±2ppm from 0°C to +40°C
● Accuracy ±3.5ppm from -40°C to +85°C
2ppm accuracy corresponds 63 seconds per year.
3.5ppm accuracy corresponds 111 seconds per year.
Performed by Actors:
Arduino Mega 2560 R3 + Ethernet Shield + RTC DS3231 + SPI TFT 1.8"
Source code:
Purchased:
#arduino
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