dpw

modified 6 years ago

Auto cut off Charger with battery status

429

06:54:26

( OPEN ALL SWITCHES BEFORE PLAYING)
Turn on power switch
Turn on column of battery’s to charge
Switch charge/discharge SPDT to change 
Battery charging RED LED will light
when full charge RED LED  WILL TURN OFF
Switch SPDT to discharge 
Switch 2nd SPDT switch for either motor or led 

Note RED LED will not light if battery’s not connected even if charge mode is selected 

published 6 years ago

dpw

6 years ago

USB powered for AA + AAA battery

hurz

6 years ago

do you know how to simplify two 100mF caps in series? Both together work like a 50mF single cap. That can safe space, cost and is good for a better overview.

dpw

6 years ago

Yes u could put just 1 capacitor but circuit it meant to show 2 x AA or AAA in series

dpw

6 years ago

2x 1.5 cell battery or capacitor in series has output of 3v but capacitance stays the same but when in parallels will be 1.5v with double capacitance

dpw

6 years ago

2 battery’s in series don’t act as half a battery if they were rated 1.5v 800mah in series would be 3v 800ma but if we’re parallel would be 1.5v 1600mah

Robert_Kidd

6 years ago

:-)

hurz

6 years ago

best to simulate accus is to use DC sources, i know thats hard to understand, 100mF are far far away from any capacitiy you like to emulate :p)

dpw

6 years ago

A 100mf capacitor is far smaller than a standard AAA battery, if I were to put a much larger capacitor in this I would be watching it charge for along time so put a small enough one to charge in about 30 seconds which NO BATTERY will charge that quick

hurz

6 years ago

The idea behind a DC voltage source is to make it change in its voltage and put the charge current voltage on a trace, i know not easy to understand. A charge cycle of a cap doesn't help a lot and cant be stoppt while charging. Whats also missing is an internal resistance, in both cases.

dpw

6 years ago

I’m not sure but are you talking about the internal battery/capacitor resistance, I’m not demonstrating battery’s I’m showing possibility’s of an op amp

dpw

6 years ago

And yes we know op amps come in different varieties too

hurz

6 years ago

interessting

dpw

6 years ago

Sorry to complicate things

hurz

6 years ago

complicate what?

dpw

6 years ago

More ops

dpw

6 years ago

Would use a lm3914 but can’t find that in options

hurz

6 years ago

thats a leds bargraph driver chip and not an OpAmp, anyway you need an Comparator. Whatever, you better make it less complex for you

dpw

6 years ago

Look at the workings of a dot/bar graph ic and u will learn it’s built from lots of comparators which is a use of an op amp so well done it’s not an op amp but could use rows of ops to take its place

hurz

6 years ago

you said "I'm showing possibility's of an op amp" not me. Remember? You did not talked about comparator.

dpw

6 years ago

Ok thank you

hurz

6 years ago

and forget LM391x use something little flexible and modern, like WS2812 and attiny. Endless RGB LED vumeter programable as you wish.

dpw

6 years ago

Ok thank u

dpw

6 years ago

I prefer the stm32

hurz

6 years ago

for a bargraph with any thinkable feature, a little atmel attiny85 does the job, no need for a STM32

dpw

6 years ago

I’ve not use those yet I started with arduino

hurz

6 years ago

but you prefer STM32, so so hmmmm after all your experiences. You mean, you had in the past some contact with stm32, only?

dpw

6 years ago

No mate

dpw

6 years ago

I first used an stm32 (blue pill on a rc plane for transmitting height speed direction which I also use the mpu9250 + bme280 + mpxv7002, nrf24l01 so needed the speed and memory that it offers so from that point I was converted

hurz

6 years ago

converted, yes! Quite a bunch of ready made toys and china sensors to play with. But the controller was stm32 and you have, if lucky a working wireless weather station in your garden. Mostlikely it was a prototype in all that chaos.😂

dpw

6 years ago

They work like a charm, great little Chinese products, great idea a glorified garden weather station is just what I need, I now think it’s time to put down you laptop and pot noddle if you catch my drift

hurz

6 years ago

yes, they are super simple to use

dpw

6 years ago

Shhhh

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