pieman wrote:torntrousers wrote: I've tried that on several ESPs and they all seem to run a bit slow so it loses about 7 minutes per day, which probably wouldn't happen with an external RTC.
I was interested in your comments about ESP's losing 7 minutes per day. Maybe I am misinterpreting your term 'losing' as our tests with WeMos D1 Mini's suggest gaining 56 minutes per day. That is, with deep sleep set at 1 hour it wakes up in less than 58 minutes.
What i meant is that i have some ESPs where they publish a sensor reading once per day, so they deepSleep the rest of the time. The maximum deepSleep interval is 72 minutes so to do the once per day wake up it actually takes 24 deepSleep's of 60 minutes. But all the ESPs i've tried this 24 x 60 minute sleep with end up with a total sleep time of a bit less than 24 hours, so wake up and do the publish about 7 minutes early. (i guess thats actually running a bit fast not a bit slow isn't it)