Yes there is a comparator, and there are a couple of articles on the web where they have been used for oven controllers, if startup and a hysteritic fluctuation in temp a little bit is not a problem then you can use one, using a comparator will give a fairly big overshoot on temp at warm up.
Pid's give a much tighter control, down to 0.1 degree and a flat startup when properly tuned.
Last night we had a massive storm here on the Highveld of Gauteng South Africa. Lightning strike within 20-30 meters of my house. When everything in the house trips out, lights flash and TV's die, you know you've been served.
Checked this morning what was destroyed last night ...
Security camera,
Internet ADSL router
PLC system 24V power supply
and ....
DS3231 RTC Li-Ion battery.
All my Arduino related equipment froze up, but after a power recycle they worked again. It was then that I noticed my RTC time reverted back to 00:00:00. I expected the worst. Lightning is nobody's friend, but luckily it was only the battery and my sealed unit's battery was still good.
Now, was it really the lightning that killed the battery, or did it run down? I now need to check if this DS3231 RTC unit charges the battery while in use???
Hello,
Both DS3231 and ds1307 are RTC so, what are the more power or benefits of DS3231?
1. What day of the week does May 28 2006 fall on
C. Sunday
Q) Isnt there any surge protector or something you can use?
1. What day of the week does May 28 2006 fall on
A. Saturday
B. Monday
C. Sunday
D. Thursday
I think you're SERIOUSLY over reacting here
I don't see as a tiny trickle charge (less than 5mA) to the battery could be in any way 'dangerous', or indeed damage the battery.
But if you want to be paranoid, then remove the resistor and replace the battery with a non-rechargeable one - this was a common modification in VCR's that used an RTC with a NiCd battery - as NiCd's often do the batteries failed, and official mods were to replace with a longer lasting non-rechargeable version. Nice little earner back in the day
Hello Nigel,
Well, that's what it might sound like, but it's a real issue and since i first posted this i have found that this is a known issue and someone already reported that their battery blew up. People on the Arduino site have reported battery 'bloating' when charged on this board with this circuitry.
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