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I tested an old NiMH 1600mA battery which I know it is in bad shape .This battery holds the charge perfectly for 1day but after that it's capacity starts rapid declining . So this method of sorting out bad batteries may not work as expected .
Your calibration seems to be slightly off .Be sure to follow this rule ratio between (Charger output) / Voltage on Pin 17) should be 2.1:1 .You could adjust the trim-pot in order to increase voltage on pin 17 by 30-50mV .This way the problem battery pack will read "2" instead of "1" . The...
The hex file is posted on page 4 on this thread . I'v made a picture which might help you to do a proper calibration ( after all ,it's just a voltage divider trouble ). Hope this helps .
Also , double-check your PCB for errors or solder bridges (maybe post your PCB for other users to see )...
"" I measure the dc voltage on charger output it is 2.85V" <- I presume the PIC is not in the charger (removed from socket , power is OFF) and you connected 2 batteries o the charger . Then do the following : adjust the trim-pot like this ratio between (Charger output) / Voltage on Pin...
The trim-pot is not corectly calibrated .
Did you use this method :
"The ratio between (Charger output) / Voltage on Pin 17) should be 2.1:1 . So if you have 0.803V on charger output -> adjust Pin 17 to 0.382V " ?
I do not own a PICKIT2 Clone( there are quite a few variants ) but if you check your programmer specifications I'm sure you will be able to find out .
This charger uses no Xtal please see schematic on page 4 .
A:" letters are shown on led display and what they mean?"
I already...
circuit sla battery charger
Sorry for the delay.
For wee85:
Slow (or soft ) charge is performed for 6 minutes at 50% charge rate.This way some false peak readings are avoided. Yuo could use something like 20-50% for 6-15min .I used only 6 minutes becouse I am charging some 280mA ( at 3C rate...
make a peak detection charger 5v
Your schematic is using pic 16f877 .I have no clue about the software burned into it so I can not help.You could try to contact the author or you could try using my schematic . PIC16F628A is cheapper.
"But by doing this when i vary any one analoge channel by potentiometer all analoge channels varies.
Tell me another way for doing this"
Some delay is always needed between set_adc_channel and read_adc .Try to use 50-100 microsec delay and everything will be fine .
In your second example...
atiny15
Your circuit is fine.
Data is send thru RS232 every second only when measured voltage has changed or every 3 seconds if data stays the same. This way is easier to plot data by omitting unnecessary points.
circuit smart charger battery nimh atmega8
https://www.angelfire.com/electronic/hayles/charge1.html
I used PIC16F628A ( no XTAL needed ). LM317 forms a constant current supply switched on and off by a micro-controller . A 5V rail for the PIC is developed through a LM7805 3-pin regulator...
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