Low Battery LED Indicator Board [OSHPark]

[Helder]

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.

[lpepe]

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 -.

[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 (4.39 MiB) Viewed 18409 times

[Helder]

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:

[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

[megamax510]

helder great!

[Merlin]

Simply awesome!
Can you share the schematic of the "solid values" version?

[djvoodoo]

Stupid question. Do I have to put 2 transistors in the parts indicated q1 and q2?

[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?

[Helder]

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

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.