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wyolum / ClockIOT

Word Clock
MIT License
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DS3231 reads are not consistant #1

Closed wyojustin closed 6 years ago

wyojustin commented 6 years ago

HW: ClockIOT First 5 complete protos (and no LED protos) SW: ClockIOT (9/26/2018)

Problem: When DS3231 is set, and subsequently read, the values can be very different.

OUTPUT: CASE 1, the absolute difference between ntp and ds3231 is greater than 5 seconds, so update ds3231. After update the incorrect value is read. A second later, the ds3231 is off my a large value, so reset it again with same result

abs diff: 111011100111111110110110000 master: 1011011101010110001110000000001 backup: 1010100001101110001111001010001 backout wrong: 1010100001101110001111001010001 SET THE BACKUP to master: 1011011101010110001110000000001 got: 1010100001101110001111001010001

abs diff: 111011100111111110110110001 master: 1011011101010110001110000000010 backup: 1010100001101110001111001010001 backout wrong: 1010100001101110001111001010001 SET THE BACKUP to master: 1011011101010110001110000000010 got: 1010100001101110001111001010001

wyojustin commented 6 years ago

Good news: I rejiggered the code to only request time from the ds3231 every 10 minutes (rather than several times per second) . so the problem is reduced by a factor of 1000 for the long term fix, this looks like it is in the right area:

https://github.com/espressif/arduino-esp32/issues/912

wyojustin commented 6 years ago

Clock is now working fine. Issue closed.