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Re: Low Battery LED Indicator Board [OSHPark]

Posted: Sun Oct 16, 2016 11:02 am
by Helder
lpepe wrote:
Helder wrote:Looks alright to me, is your battery charged? do you have a multimeter to show how much voltage it has? Also try a pot like in the first schematic I posted and mess with the values to see when it lights up at the battery voltage when it's low and take the measurements with a multimeter of the POT to get the resistor values.

Of course, it's charged. With potmeter didn't tried yet, I didn't ordered one....

I used a 18650 li-ion battery, but I think this isn't the problem? (the battery is brand new Samsung cell...)
You're multimeter shows it's a negative voltage so maybe you have the battery backwards? hence why the light is always on.

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Sun Oct 16, 2016 11:07 am
by lpepe
Helder wrote:
lpepe wrote:
Helder wrote:Looks alright to me, is your battery charged? do you have a multimeter to show how much voltage it has? Also try a pot like in the first schematic I posted and mess with the values to see when it lights up at the battery voltage when it's low and take the measurements with a multimeter of the POT to get the resistor values.

Of course, it's charged. With potmeter didn't tried yet, I didn't ordered one....

I used a 18650 li-ion battery, but I think this isn't the problem? (the battery is brand new Samsung cell...)
You're multimeter shows it's a negative voltage so maybe you have the battery backwards? hence why the light is always on.
No, just the multimeter plugs were inverted in-plugged.
The red wire from the battery is + and the black is -.

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Fri Nov 25, 2016 6:35 pm
by Purple_Moogle_00
I'm not at all good with all this calculating resistors and such, but if one could clarify that would be great. It's set up like this correct?
20161125_203428.jpg
20161125_203428.jpg (4.39 MiB) Viewed 11602 times

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Sun Nov 27, 2016 2:02 pm
by Helder
Purple_Moogle_00 wrote:I'm not at all good with all this calculating resistors and such, but if one could clarify that would be great. It's set up like this correct?20161125_203428.jpg
I have another board on the first post that shows the resistor values so no idea what you're talking about and it should be wired like this:

Image

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Mon May 29, 2017 9:17 am
by Marty33
Hello @Helder.

After working on my project, i broke the Red led on my Powerboost 1000C.

Your Low Battery LED Indicator is always a solution ?

I can use your solution and place it between the battery and Powerboost ?

Big thanks

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Mon Jun 26, 2017 11:56 am
by megamax510
helder great!

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Thu Feb 22, 2018 1:06 pm
by Merlin
Simply awesome!
Can you share the schematic of the "solid values" version?

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Mon May 14, 2018 12:55 pm
by djvoodoo
Stupid question. Do I have to put 2 transistors in the parts indicated q1 and q2?

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Tue Apr 02, 2019 10:44 am
by NasiNoot
so i have bought this cheap psu for my gbz build:
https://aliexpress.com/item/Top-Deals-3 ... Title=true
i don't know for sure if it has support for leds, does anyone know?
if not, would this board work?

Re: Low Battery LED Indicator Board [OSHPark]

Posted: Tue Apr 02, 2019 12:14 pm
by Helder
NasiNoot wrote:
Tue Apr 02, 2019 10:44 am
so i have bought this cheap psu for my gbz build:
https://aliexpress.com/item/Top-Deals-3 ... Title=true
i don't know for sure if it has support for leds, does anyone know?
if not, would this board work?
Necro Bump to post something not even related to this thread :roll:

It's the generic PSU mentioned in the wiki and it also has the LED locations you can solder them on yourself to have charging status and low battery indication.