battery charger +bascom avr
OK Dude,
I'll check everything.
Before reading your message I was doing some tests:
Diodes D1 D2 on the left side of the board.
Resistor 1.25R - using 2.2R
Resistor 0.8 - using +- 0.5R
For pot 2k5 and resistor 2k2 - have changed several times with values 2k2 and 1k
for pot, and 1k, 1k2, 0.8k for resistor.
For each change I make calibration on pin 17 without pic on circuit, this calibration is easy to make and is precise.
Battery, I'm using one NIMH.
In all tests, the charger only discharge, not start charging
Then I tried with four cells NIMH:
Now the good news, worked perfectly, discharge and start chargin.
To confirm I have made a new test with four old NICD from celular, and again very good, discharge and charge completely until display showed F (final).
Now let's go to work on charging one cell each time.
Thanks Dude, you are helping a lot.
Renato
Added after 3 hours:
More good news,
With two NIMH cells the charger works without problem, discharge and start charging.
Dude, if the charger is working well with two or four cells, do you think it has problem in components and because this it´s not possible to charge one cell?
I measured the current on charger output without pic on circuit and found 580 mA (using resistor 2.2R), for me is OK.
"The charger displays E A only when batteries where removed while charging (the voltage output rises to Vcc-2.5V where 2.5V=Voltage across LM317 => it senses a high voltage => turns off LM317 and checks again for batteries ) or batteries where connected , charging started but voltage on batteries rises above safe level (LM317 trouble)."
Is it possible to measure this voltage on output charger?