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matsstaff / stc1000p

Programmable thermostat firmware and arduino based uploader for the STC-1000 thermostat
GNU General Public License v3.0
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OVBSC: not entering thermostat mode when strike temperature reached #90

Closed karlp closed 7 years ago

karlp commented 8 years ago

I'm going to have run some more tests on this, but it doesn't seem to be switching to thermostat mode when strike temps are reached. Today I came back late, the alarm was beeping, but the temp was up at 75C, (strike was meant to be 69), I don't think my P0 output ratio was too high, it was only 30, and later during first mash, it wasn't even holding heat and I had to raise it to 45%.

matsstaff commented 8 years ago

Do you have any additional information on this issue? Have you checked the APF flags are set correctly? I don't get a ton of feedback from users, but at least a few have reported OVBSC working as expected.

karlp commented 8 years ago

will be brewing again tomorrw and will recheck, I realise it's a kinda vague report :(

karlp commented 8 years ago

As far as I can tell, it doesn't switch off the S0 output when St is reached, only when the alarm is acknowledged and you enter the "pause" mode for dough in.

matsstaff commented 8 years ago

That is excellent information! Makes it a lot easier to troubleshoot. I'll look into it. Thanks!

matsstaff commented 8 years ago

Are you running the latest code (that is current from master branch)? Because, I've been mulling over the piece of code, knowing what to look for, and it really looks like it should switch to thermostat mode with PO output right after St is reached and before the alarm/pause. Cheers!

karlp commented 8 years ago

I'll have to try again, going to have to get on it more anyway, if I ever want to nail down this mash temp

karlp commented 7 years ago

After brewing again tonight, I believe this is behaving "as designed" but it's very susceptible to the tuning of the P0 factor :| Setting S0 to a low enough ratio to not overshoot much is just pointlessly slow, so it overshoots there (no circulation to keep the thermoeter stable) and then P0 has a tendendecy to either heat too much or not keep heat. I believe my P0 setting was simply too high in the past.