Low Battery Indication circuit

[mnealtx]

Right - but a flip flop isn't necessarily only used as memory - i was thinking of a way to toggle power for the yellow portion of the 'fuel tank' if necessary.

[kinabaloo]

Right - but a flip flop isn't necessarily only used as memory - i was thinking of a way to toggle power for the yellow portion of the 'fuel tank' if necessary.

I realised that lol.

I think we need nothing more than 2 opamps.

[mnealtx]

I realised that lol.

I think we need nothing more than 2 opamps.

Ok...but what are we looking at, size-wise? Still able to be stuffed into a single battery space, along with a power connector for the atomizer and the pushbutton? Can we still build in the charger circuit?

[kinabaloo]

Ok...but what are we looking at, size-wise? Still able to be stuffed into a single battery space, along with a power connector for the atomizer and the pushbutton? Can we still build in the charger circuit?

Maybe 2cm x 2cm x 1.5cm

if very careful

[mnealtx]

Maybe 2cm x 2cm x 1.5cm

if very careful

That's getting awfully tight...

[kinabaloo]

That's getting awfully tight...

Maybe just do the single indicator (2 leds and 1 resistor; dims at 3.4v); only one LED displayed. Then dont need a board.

[mnealtx]

Maybe so - I still think there should be SOME way to use a red-green LED without a huge amount of extra components stuff in there...even if it's ONLY red and green.

[kinabaloo]

Maybe so - I still think there should be SOME way to use a red-green LED without a huge amount of extra components stuff in there...even if it's ONLY red and green.

Ok, the combined LED goes in case (visible); then two more red LEDs and 2 resistors 'feeding them'. Should be possible. Need to check circuit works as expected first.

[mnealtx]

I'm still not following why another 2 LEDs and resistors would be needed. I'm thinking it *should* be possible to use the output of one channel to trigger another channel.

If so, you have the R+G triggered on at voltage X by channel B, and channel C clamping the input to channel B at voltage X-Y....like a latch circuit

[kinabaloo]

I'm still not following why another 2 LEDs and resistors would be needed. I'm thinking it *should* be possible to use the output of one channel to trigger another channel.

If so, you have the R+G triggered on at voltage X by channel B, and channel C clamping the input to channel B at voltage X-Y....like a latch circuit

No need for triggering just do in real time.

What will be determing if the voltage is above or below X or Y - that's what the other LEDs are for. 2 in series giving a rough voltage reference (rather like a zener diode).