NiMH charger 1 uses a ATMEGA8 to implement a software switch mode power supply controller.
This project uses the AVR's USART, timers, PWM controller, ADC, EEPROM and weak pullups .
A CPU based NiMH charger
NiMH.
NiMH cells are gaining wide popularity in, amongst other places, digital cameras.
The energy density in NiMH cells may be lower than that of lithium ion cells, but the fact that they are, in most equipment, interchangeable with disposable dry cells makes them very attractive power sources.
The similar electrical and mechanical considerations of NiMH and to dry cells, translates into a wide supply of relatively low cost cells. Also, in case of an emergency, you can always revert back to dry cells if all your NiMH cells are discharged.
NiMH should under ideal charging conditions charge for 14 hours at 10% of their rated hourly capacity.
The charger.
This project provides a good NiMH charger that charge for the full 14 hours and then switches itself off.
Link: http://www.opend.co.za/hardware/nimh1/nimh1.htm
This project uses the AVR's USART, timers, PWM controller, ADC, EEPROM and weak pullups .
A CPU based NiMH charger
NiMH.
NiMH cells are gaining wide popularity in, amongst other places, digital cameras.
The energy density in NiMH cells may be lower than that of lithium ion cells, but the fact that they are, in most equipment, interchangeable with disposable dry cells makes them very attractive power sources.
The similar electrical and mechanical considerations of NiMH and to dry cells, translates into a wide supply of relatively low cost cells. Also, in case of an emergency, you can always revert back to dry cells if all your NiMH cells are discharged.
NiMH should under ideal charging conditions charge for 14 hours at 10% of their rated hourly capacity.
The charger.
This project provides a good NiMH charger that charge for the full 14 hours and then switches itself off.
Link: http://www.opend.co.za/hardware/nimh1/nimh1.htm