A BETTER BATTERY CHARGER

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A BETTER BATTERY CHARGER

Lessons from the Trenches Part 2: Hardware and Software Implementation
by Thomas Richter

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

THE STABLE_ADC FUNCTION

The stable_ADC function is used when measuring battery voltage or temperature (see Figure 7). It makes sure the ADC values are stable inside a defined area. This is important for an accurate measurement. The function loops until it gets three ADC values where the highest is no more than one step higher than the lowest.

Figure 7ıHere the ADC accuracy is increasing.

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