Batteries without thermostat
#1
Tongue 
I have a two wire battery and I tried connecting it to the board on pin one and the but it seems not to work.  According to the silk screen, and schematic that is correct. The schematic has a note however that I don't understand
 "If do not use temp. Measure feature. Place OR."  I am not sure what this means or what OR  Is referring to, seems that I need to do something but I'm not sure what... Any ideas?
Little beats big when little is smart. First with the head, then with the heart.  P.K. ~Power of One~
  Reply
#2
(05-28-2016, 11:12 PM)MrWizerd Wrote: I have a two wire battery and I tried connecting it to the board on pin one and the but it seems not to work.  According to the silk screen, and schematic that is correct. The schematic has a note however that I don't understand
 "If do not use temp. Measure feature. Place OR."  I am not sure what this means or what OR  Is referring to, seems that I need to do something but I'm not sure what... Any ideas?

The middle wire connects to temperature sensor (termistor) that located in close or middle of lithium battery pack, this allows the Pine A64 board to cut off charging power if discover battery temperature raise up. If using temperature measurement feature but no termistor in place situation, then need to place a 10K resistor.
  Reply
#3
So either a thermistor or 10kΩ resister from pin 2 to ground then is my understanding?

Yup that worked, got a thermistor I salvaged out of some such thing and slapped it on pin two to ground and Ubuntu recognized it immedeatly. Now lets see if it is too dischaged to be recharged, or if it will grace me with some charge! Ubuntu says it is charging, I don't currently have an amp meter on the unit. I need to build a 5.5mm female to 5.5mm male bypass to connect my DMM inline with the positive connector so I can monitor current if I want to... Another project WEEE!!!!! Smile THANKS AGAIN @tllim

So before I connected it the battery read 2.8v when I connected it to the pine Ubuntu read 2.8v and now it is showing 3.1v still not registering any percentage full, but that is defenantly promising. The charger I have for my R/C car wont charge lipo batteries under a certian voltage threashold, and 2.8 of 3.7 triggered the low voltage warning so it wouldn't charge there. But it seems to be here, I suspect once it gets back up to 3.7ish volts it will start registering as having some capacity charged. I will still be buying an official battery when they are released, but this will justify my buying the touch screen since I can use it with this tiny 3000mA/h battery to go back and forth between my room. So I will order up one next week and then when it arrives attmept to make a lego case to hold it till the ABS tablet cases are availbile on the store. SO excited! As I was writing this it ticked to 1% WOOT! Verification of charge! Again thanks tllim, I knew I was missing something simple to get it going, just wish that the schematic note was more helpful. But forum is second best with a reply in less than a day so I am not complaining at all.
Little beats big when little is smart. First with the head, then with the heart.  P.K. ~Power of One~
  Reply
#4
(05-29-2016, 01:30 AM)MrWizerd Wrote: So either a thermistor or 10kΩ resister from pin 2 to ground then is my understanding?

Yup that worked, got a thermistor I salvaged out of some such thing and slapped it on pin two to ground and Ubuntu recognized it immedeatly.   Now lets see if it is too dischaged to be recharged, or if it will grace me with some charge!  Ubuntu says it is charging, I don't currently have an amp meter on the unit.  I need to build a 5.5mm female to 5.5mm male bypass to connect my DMM inline with the positive connector so I can monitor current if I want to...  Another project WEEE!!!!! Smile THANKS AGAIN @tllim

So before I connected it the battery read 2.8v when I connected it to the pine Ubuntu read 2.8v and now it is showing 3.1v still not registering any percentage full, but that is defenantly promising.  The charger I have for my R/C car wont charge lipo batteries under a certian voltage threashold, and 2.8 of 3.7 triggered the low voltage warning so it wouldn't charge there.   But it seems to be here, I suspect once it gets back up to 3.7ish volts it will start registering as having some capacity charged.  I will still be buying an official battery when they are released, but this will justify my buying the touch screen since I can use it with this tiny 3000mA/h battery to go back and forth between my room.  So I will order up one next week and then when it arrives attmept to make a lego case to hold it till the ABS tablet cases are availbile on the store.  SO excited! As I was writing this it ticked to 1% WOOT!  Verification of charge! Again thanks tllim, I knew I was missing something simple to get it going, just wish that the schematic note was more helpful.  But forum is second best with a reply in less than a day so I am not complaining at all.
Welcome Smile
  Reply
#5
(05-29-2016, 01:30 AM)MrWizerd Wrote: So either a thermistor or 10kΩ resister from pin 2 to ground then is my understanding?

Yup that worked, got a thermistor I salvaged out of some such thing and slapped it on pin two to ground and Ubuntu recognized it immedeatly.   Now lets see if it is too dischaged to be recharged, or if it will grace me with some charge!  Ubuntu says it is charging, I don't currently have an amp meter on the unit.  I need to build a 5.5mm female to 5.5mm male bypass to connect my DMM inline with the positive connector so I can monitor current if I want to...  Another project WEEE!!!!! Smile THANKS AGAIN @tllim

So before I connected it the battery read 2.8v when I connected it to the pine Ubuntu read 2.8v and now it is showing 3.1v still not registering any percentage full, but that is defenantly promising.  The charger I have for my R/C car wont charge lipo batteries under a certian voltage threashold, and 2.8 of 3.7 triggered the low voltage warning so it wouldn't charge there.   But it seems to be here, I suspect once it gets back up to 3.7ish volts it will start registering as having some capacity charged.  I will still be buying an official battery when they are released, but this will justify my buying the touch screen since I can use it with this tiny 3000mA/h battery to go back and forth between my room.  So I will order up one next week and then when it arrives attmept to make a lego case to hold it till the ABS tablet cases are availbile on the store.  SO excited! As I was writing this it ticked to 1% WOOT!  Verification of charge! Again thanks tllim, I knew I was missing something simple to get it going, just wish that the schematic note was more helpful.  But forum is second best with a reply in less than a day so I am not complaining at all.
[quote pid='10727' dateline='1464507006']
what is the cut off voltage of the battery in Pine A64 Ubuntu 16.04?
[/quote]

Need help on the battery cut off voltage
  Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Using tablet displays and batteries janeku 4 551 06-10-2016, 01:13 AM
Last Post: tllim

Forum Jump:


Users browsing this thread: 1 Guest(s)