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I want to build uninterruptible power supply 12V, 0.5A, with batteries of 3-4Ah for home alarm sistem.
UPS is specific for using batteries because in normaln situation, batteries are always in stand by mode. Only if there is some fault, batteries must work.
I think that LM2574 is good choice...
pic16f84 charger
I discharge battery with constant curent until 1V per cell.
I need only to measure time of discharging and calculate battery capacity.
If battery discharge take 10 hours at 200mA, than battery capacity is 2000mAh.
Thats all.
Discharging start-stop are automatic.
Discharging...
battery charger circuit+pic16f
I charge Ni-MH with modified factory switcher schematic and works great. At 2.5A everything is cold.
Before that I tried with linear charger, and disipation was very high.
Thank you for reply!
I want to display data on 16x2 LCD or LCD from any old cell phone (3310,8210,7110,...)
I ask for 16F84 schematic because I have lot of this pics, but also it will be great if you give me this project with another pic too.
A year ago I had this schematic with two channel...
Re: repel cats
This circuit emites a lot of ultrasonic frequencies. I think it's good for cats too.
Just play with various frequencies, and cats will go away.
mah meter
I built switching inteligent battery charger with MAX712 with discharging unit, and now I want to add digital V meter (15Vdc max), A meter (3A max) and I want to measure battery capacity while is connected to discharging circuit.
Charge-discharge is automatic with LED signalisation...
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