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NiCd Battery Charger using PIC16f676

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Waqas_MicroSolutions

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hi.. I have programmed PIC16f676 for charging 6 cell(7.2) volts NiCd Battery... The only problem remaining is..

to make constant current soutce of 1.2Amps (can be changed), such that if enabled (by applying 1 from Controller port pin) , battery should be charged with this constant current and when I disable it (by applying zero from a port pin), it should behave like an open switch as if it were not present (Nothing goes in, nothing goes out or as if battery were disconnected)... I have I/P Voltages of about 12Volts, the voltage that appears at the O/P of this current source should be fixed irrespective of its I/P voltage..
Kindly, guide what to do... or give me exact scematic for that with actual values of components...
Regards..
 
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"Waqas_MicroSolutions"

I would give you a very honest advise and that is:
This is a discussion board on electronics, and the section that you are posting is related to micro-controllers. Every other day I see posts from people having only one post on their account, asking for the same kind of thing. "need help......., would someone provide complete schematics, ....... and program as well"

Many of these posts/threads go un answered, reason is though there are lot of people here whose knowledge and skills in electronics, mcu, and programming are admirable, but they wouldn't bother to reply to such posts. Reason is how could such thread starter expect them to do everything for them, when they themselves have not done anything, not even searching on google.

Please do some research, come up with some working post the results problems here and you will get help.

The problem you are referring to is very basic and can be done with ease.
 
"Waqas_MicroSolutions"

I would give you a very honest advise and that is:
This is a discussion board on electronics, and the section that you are posting is related to micro-controllers. Every other day I see posts from people having only one post on their account, asking for the same kind of thing. "need help......., would someone provide complete schematics, ....... and program as well"

Many of these posts/threads go un answered, reason is though there are lot of people here whose knowledge and skills in electronics, mcu, and programming are admirable, but they wouldn't bother to reply to such posts. Reason is how could such thread starter expect them to do everything for them, when they themselves have not done anything, not even searching on google.

Please do some research, come up with some working post the results problems here and you will get help.

The problem you are referring to is very basic and can be done with ease.
I'll second that and totally agree.

Waqas_MicroSolutions
NiCd Battery Charger using PIC16f676

hi.. I have programmed PIC16f676 for charging 6 cell(7.2) volts NiCd Battery... The only problem remaining is..

to make constant current soutce of 1.2Amps (can be changed), such that if enabled (by applying 1 from Controller port pin) , battery should be charged with this constant current and when I disable it (by applying zero from a port pin), it should behave like an open switch as if it were not present (Nothing goes in, nothing goes out or as if battery were disconnected)... I have I/P Voltages of about 12Volts, the voltage that appears at the O/P of this current source should be fixed irrespective of its I/P voltage..
Kindly, guide what to do... or give me exact scematic for that with actual values of components...
Regards.. .
If you used the search button you will already find that thia has been done so why reinvent the wheel and to be honestyou have given us nothing at all your problem could be hardware or software related, The list is endless
 

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I'll second that and totally agree.


If you used the search button you will already find that thia has been done so why reinvent the wheel and to be honestyou have given us nothing at all your problem could be hardware or software related, The list is endless

Well..to be very honest, Both answers are valuable for me... But the bottom line is, I have little or you can say no knowledge of Electronics and I have been searching for an appropriate hardware, for about two weeks..
and My problem is hardware, software is not a problem as I already mentioned..
I have seen many circuits like ..
this..
http://www.reuk.co.uk/print.php?article=LM317-High-Current-Voltage-Regulator.htm
and this..
Why don't we use op-amp current sources? - Laser Pointer Forums - Discuss Lasers & Laser Pointers

the only thing I require is the mechanism that can isolate the battery from charging line..with some solid state circuitry (without using a relay) whenever MicroController portpin (RC0, in my case) is low..



Regards..
 

I may have miss understood the question, You could use a transistor has a switch or a solid state relay which may be the better option.
There is a good universal battery charger topic here and dexter dude has done but I don't think they isolate the battery

Wizpic
 

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