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A BETTER BATTERY CHARGER

Part 2: Hardware and Software Implementation
by Thomas Richter

Start ý The Buck Converter ý Voltage Reference and Battery Temperature ý AT90S2333 Battery Charger ý ATtiny15 Battery Charger ý Charge Current ý Software Implementation ý User Settings ý Source Code ý INT Battery Function ý The Stable_ADC Function ý BC.H ý B_DEF.H ý Charge MethodýSLA.C ý Charge MethodýNiCd.C and NiMH.C ý Charge MethodýLilon.C ý Suggested Improvement ý Sources and PDF

USER SETTINGS

The charger is built as a multipurpose charger that can charge four types of batteries and a great number of cells by changing parameters before compiling the code. It is important that these are done properly before compiling to avoid damage to the battery and surroundings.

The following list shows you how the batteries and cells should be changed:

ý To change the battery type, you must include the desired battery files in the compiler before compiling and "uncomment" the battery type under "Battery Type" in B_Def.h. There is a C file and an h file for each battery type.

ý To change the number of cells, change the parameter "cells" in B_Def.h.

ý To change cell capacity, change the parameter "capacity" in B_Def.h.

ý To change the Li-Ion cell voltage, change the parameter "cell_voltage" in B_Def.h.

ý After changing the resistor values, as described previously, the parameters "voltage_step" and "current_step" must be changed in B_Def.h.

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