Battery Voltage Detector

Need to monitor the battery voltage on PIC32 !?

Here is a web link regarding using LED forward voltage with ADC : link

The battery voltage measured 1.76V as the RED LED forward voltage.

Left:calculated the VDD=3.1V                              Middle:Circuit Diagram                             Right: Calculation

The ADC of LED forward voltage 1.76V got 581 counts.   581 = (1.76/ 3.1)*1024 

The Vdd estimation: Vdd = (1024*1.76 )/ ADC-count   

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