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Forum Index : Microcontroller and PC projects : MM and HC-12 battery useage

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Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3308
Posted: 09:18pm 21 Sep 2017
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  Andrew_G said  I can easily reduce the CPU speed to 5 whilst the MM is asleep

That is not necessary. When the MM goes into sleep the CPU clock is completely stopped, so its non sleep running frequency has no relevance.

Geoff
Geoff Graham - http://geoffg.net
 
HankR
Senior Member

Joined: 02/01/2015
Location: United States
Posts: 209
Posted: 09:56pm 21 Sep 2017
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  Geoffg said  
  Andrew_G said  I can easily reduce the CPU speed to 5 whilst the MM is asleep

That is not necessary. When the MM goes into sleep the CPU clock is completely stopped, so its non sleep running frequency has no relevance.

Geoff


I noticed that but chocked it up to a misinterpretation of an earlier suggestion or just a mistake in expressing the clock slow down.

At any rate, the suggestion given was that the 5 MHz clock be activated after the one-wire temp reading is made which is what Andrew will try.

Hank
 
Andrew_G
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Joined: 18/10/2016
Location: Australia
Posts: 872
Posted: 12:49pm 27 Sep 2017
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Hi, my MM170/HC-12 remote finally died after 4 weeks.
The final AA voltages were 2x 1.46 (2.92v). (I will do the above measurements ASAP but have a few distractions at present).

Andrew
 
disco4now

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Joined: 18/12/2014
Location: Australia
Posts: 1044
Posted: 01:30pm 05 Oct 2017
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Hi Andrew,
As you are using an MM170 you might be interested in monitoring the battery level by reading the internal reference value. This was removed from MMBASIC but the post below gives a CFunction that can use it.



Reading internal reference

Gerry
F4 H7FotSF4xGT
 
Andrew_G
Guru

Joined: 18/10/2016
Location: Australia
Posts: 872
Posted: 03:28pm 05 Oct 2017
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Gerry, Thanks!
That means I could read the remote unit's voltage and report it say once a day? & !
Another feature to try, cheers,

Andrew
 
HankR
Senior Member

Joined: 02/01/2015
Location: United States
Posts: 209
Posted: 11:15am 12 Oct 2017
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  Quote   Hi, my MM170/HC-12 remote finally died after 4 weeks.
The final AA voltages were 2x 1.46 (2.92v).
Andrew

The above shutdown was solely due to reaching the HC-12 lower voltage limit of just under 3 volts typically.
 
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